(since 1865), Boise Airport Annual Precipitation & Rankings Within 50 miles also contains extreme variations in elevation (7,556 feet). Extreme precipitation events are projected to become more frequent. Temperature (F) Relative Humidity Wind Chill (F) Heat Index (F) Pressure Precipitation (in.) Enter Keyword, Phrase, or Text to including the Boise temperature history for 2022. Boise gets some kind of precipitation, on average, 87 days per year. Jul. Throughout the year, in Boise, there are 116.8 rainfall days, and 15.08" (383mm) of precipitation is accumulated. Copyright TWC Product and Technology LLC 2014, 2023, Watch A Rainbow Form As A Funnel Cloud Passes Through Rural Illinois, Snow Traps Residents, Vacationers In California, New York City Sees First Inch-Plus Snowfall Of The Season, Northern Lights Dance Over National Park In Alaska, Malaria Is Gaining Ground In Africa Due To Climate Change, Daylight Saving: When It Is, How To Prepare, And Why Its Not Going Anywhere, Democratic Republic of the Congo | Franais, State of Vatican City (Holy See) | Italiano. In a typical year, April 1 would be the benchmark for peak snowpack around Idaho, but the snow in the mountains . **Beginning Oct 1, 2021, the Snow Survey & Water Supply Forecasting Program transitioned to new hydroclimatic normals for the most recent 30-year period (1991-2020), please see our special reportfor more information.**. The Valley and the surrounding agricultural land is heavily dependent on irrigation, with this moisture playing a role in modifying the local climate of the Valley to some extent. The area has a cool season maximum of precipitation while the warm season is mostly dry. The bulk of the annual precipitation is received between November and May with three quarters of the amount. More Climate Data Boise. Endangered Stations in Idaho, Customize table to display other current-condition parameters. Hot Summer of 2013, Boise's Yearly Total of 0 degree Days or Colder Aug. Sep. Oct. Nov. Dec. Burns Monthly Almanacs Major blizzards that dump ten inches or more . Annual Weather SummaryNovember 2022 to October 2023. Boise, Idaho - Climate and weather forecast by month. search the site, Beginning Oct 1, 2021, the Snow Survey & Water Supply Forecasting Program transitioned to new hydroclimatic normals for the most recent 30-year period (1991-2020), please see our, Month to Date Precipitation (NRCSSNOTEL), Water Year to Date Precipitation (NRCSSNOTEL), Natural Resources In winter youll see another, quieter side of the park with mid-february the most likely snowshoeing time. Several inches of snow may fall in this example and some of Boises biggest snowfalls have occurred in this way. The K ppen Climate Classification subtype for this climate is "Csb". Boise's Consecutive Days with Snow Cover Throughout the year, in Boise, there are 116.8 rainfall days, and 15.08" (383mm) of precipitation is accumulated. The clearer part of the year in Boise begins around June 10 and lasts for 4.1 months, ending around October 13. Time Zone. St James's, England, United Kingdom 41 F Cloudy. Climate in Idaho. Daylight saving time (DST) is observed in Boise during 2023, starting in the spring on March 12, lasting 7.8 months, and ending in the fall on November 5. Detailed daily weather statistics (usually for yesterday), including temperature, precipitation, degree days, wind, humidity, sunrise/sunset, and record temperature data for the following day. Temperature C (F), Max. Weather Today Weather Hourly 14 Day Forecast Yesterday/Past Weather Climate (Averages) Currently: 42 F. Snowfall January through April, November and December are months with snowfall. Northern Cleveland county was the big winner with 157% of normal rainfall. A series of tables gives data by year for temperature, precipitation and snowfall. MERRA-2 Modern-Era Retrospective Analysis. On only three occasions since 2000 has monthly rainfall in the area eclipsed the inch mark for the whole month in 2009 (1.5 . WIND SPEED: On the other hand, early Autumn from mid September through much of October is the least windy time with a more stagnant and stable weather pattern over the area. Boise has dry periods in February, June, July, August, September and October. And in the west end of the Treasure Valley a persistent temperature inversion with snow cover keeps winter temperatures several degrees colder than Boise. Redmond, and J.G. In the absence of dynamic weather systems, the Mountain/Valley terrain relationship causes a diurnal trend in the wind direction. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The percentage of time spent at various humidity comfort levels, categorized by dew point. Curious what the average weather is like in a specific month? A strong pressure gradient develops over southwest Idaho . July is the warmest month, with an average high-temperature of 87.8F (31C) and an average low-temperature of 60.6F (15.9C). April is the last month it regularly snows in Boise. FOGLOW CLOUDS AND INVERSION IMPACTS: Apr. The stations contributing to this reconstruction are: To get a sense of how much these sources agree with each other, you can view a comparison of Boise and the stations that contribute to our estimates of its temperature history and climate. Because Boise lies within the main belt of the westerlies, Maritime Polar air masses dominate the region much of year, but they are considerably modified by the time they reach the local area. The numbers here describe what the weather in Boise, Idaho was like for every year since 2010. However, the number of 1-inch extreme precipitation events has been above average for the past 16 years and has been trending upward since 2000 (Figure 6). The weather in Boise in April is very cold with temperatures between 33F and 51F, warm clothes are a must. Ontario Dobson, 2013: Track monthly data on how Boise County experiences severe weather, including precipitation and temperature. NRCS, n.d.: Current Water Year Data. . Sun & Moon. Monthly: 1981-2010 normals. Rainfall In Boise, during 13.9 rainfall days, 1.3" (33mm) of precipitation is typically accumulated. Rainfall In February, the rain falls for 11.7 days. However, more rain is on the way Tuesday, bringing . Detailed climate information with charts - average monthly weather with temperature, pressure, humidity, precipitation, wind, daylight, sunshine, visibility, and UV index data. The cold season lasts for 3.1 months, from November 18 to February 21, with an average daily high temperature below 47F. 43.62 N, 116.2 W. Current Month Summary Graphics. Cold frontal passages in winter produce snow showers of shorter duration but may accumulate a dusting to a couple inches behind the cold front but usually not large amounts. They begin with average maximum and minimum temperatures in degrees Fahrenheit and Celsius. If the ridge to the east persists or strengthens, the pressure gradient in the Treasure Valley increases causing local surface winds to blow from the east or southeast with peak gusts as high as 40 to 50 mph. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The effect from all these Mountain ranges is to make Boise and the Treasure Valley semi-arid with relatively mild winters for its northern location. National Weather Service All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . (since 1865), Boise Airport Seasonal Precipitation & Rankings The rainstorm Sunday did help bring Boise's precipitation totals closer to normal for the water year, but the total still lags by 1.35 inches. July is the warmest month of the year. We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. Higher spring temperatures will also result in earlier melting of the snowpack, further decreasing water resources during the already dry summer months. Javascript is disabled in this browser. Thus, the mean temperature average on this month of may in Boise (Idaho) is 58F. Statewide, there is substantial variability but no overall trend in total annual precipitation for the 126-year period of record (Figure 5). High: 37.4f @2:50 PM Low: 24.08f @3:53 AM Approx. (since 1865), Boise Airport Monthly Temperature Rankings Current Records: San Diego State 23-5; Boise State 22-7 The #18 San Diego State Aztecs and the Boise State Broncos are set to square off in a Mountain West matchup at 9 p.m. A winter warming trend is reflected in a significant decline in the number of very cold nights, which has been below average since 1990 (Figure 4). The temperature in July averages 25.9 C | 78.6 F. In: Knowlton, K., 2015: Climate Change Boise Heaviest Precipitation Events The transitions to and from daylight saving time are indicated by the 'DST' labels. That's followed by how many really hot and cold days occurred each year. Mature non severe thunderstorm cells sending outflow into the Treasure Valley. Monthly Precipitation. Garden City Wildfires for Annual 2012. This is better than the previous month since in march it receives an average of 4.7in of precipitation over 8 days. Yellowstone National Park is the crown jewel of America's nature parks, Yosemite National Park is definitely worth a visit, Go on a sustainable wine tour in Paso Robles, Show average precipitation in Boise in Millimeter, many cities in the United States of America, Find out where to go with our weather planner. The month with the least precipitation on average is August with an . *. The month with the most days of rain alone in Boise is November, with an average of 6.7 days. . The warmest month, on average, is July with an average temperature of 75.8F (24.3C). National Oceanic and Atmospheric Administration, The coolest month on average is December, with an average temperature of 30.7F (-0.7C). DST Changes. In addition, the Rocky Mountains to the east act as a barrier to cold shallow air masses moving southward from Canada in winter. Vermont is one of the nicest states in the US. The winter of 199697 brought tremendous amounts of snow (80100 inches) to some parts of the state. Click the copy button above. The tables below give yearly averages for rainfall plus snowfall at cities, towns and parks in Idaho. (Mediterran Climate). The U.S. Drought Monitor started in 2000. Snowfall at Boise averages around 20 inches per year but can vary from a low of only a few inches to 30 to 40 inches. 1997: The Winter of '96-'97: West Coast Flooding. The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. HistoricalData The hottest month of the year in Boise is July, with an average high of 92F and low of 62F. Winter and spring precipitation is also projected to increase in Idaho over this century (Figure 8), while decreases in summer precipitation are possible, especially in the southeastern portion of the state. DST Changes. DST Changes. Jul. Please Contact Us. PRECIPITATION: Weather Today Weather Hourly 14 Day Forecast Yesterday/Past Weather Climate (Averages) Currently: 29 F. Snowfall January through April, November and December are months with snowfall . Get data on how different regions and populations experience temperature, precipitation, and extreme weather events historically. For comparison, the hottest month in Boise, July, has days with highs of 92F (33C) and lows of 61F (16C). The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. Sittel, and D. Ross, Jul. Boise (/ b z i / BOY-zee, locally / b s i / BOY-see) is the capital and most populous city of the U.S. state of Idaho and is the county seat of Ada County.As of the 2020 census, there were 235,684 people residing in the city. The Lower Snake River Valley, which the Treasure Valley lies within, slopes downward from southeast to northwest with elevation decreasing from Mountain Home to Boise, then to Ontario Oregon. The climate is relatively cool there may, but it is tolerable by dressing cosy. Monthly averages Boise Longitude: -116.215, Latitude: 43.6187 Average weather Boise, ID - 83702. The tourism score favors clear, rainless days with perceived temperatures between 65F and 80F. Still, about three-quarters of the state remains in a drought. Meridian In total there are 202.49 hours of sunshine in January. Humidity July is the least humid month in Boise, with an average relative humidity of 30%. Weak high pressure aloft kept temperatures mild through the 5 th. The thin dotted line is the corresponding average snowfall. Mountain Home, Climate-Data.org / AM OP / OpenStreetMap contributors, Weather by month // weather averages Boise. A cold frontal passage. (since 1865), Boise Airport Monthly Precipitation Rankings Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations. We assume no responsibility for any decisions made on the basis of the content presented on this site. Policies and Notices, U.S. Department of the Interior | US Dept of Commerce The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest). The most popular time to visit is July, August. You can jump to a separate table for each region of the state: Eastern, Central, Southwestern and Northern Idaho. Wind gusts 25 to 35 mph occur with the frontal passage but decrease rapidly behind the front. The black isolines are contours of constant solar elevation. Monthly temperature, precipitation and hours of sunshine. Boise's "Cold" Streak Records Data Updated Nov 1. It is highly variable from year to year and has generally declined since the mid-20th century (Figure 7). (since 1940), Boise's Yearly Total of 100 degree Days or Warmer Still, it's not likely we'll surpass the 3.41-inch precipitation record for June, which was set in 1884 and tied in 1941. The year 2015 was the second-hottest (after 1934) since records began in 1895, with a statewide average temperature of 46.4F. All NOAA. The month with the most wet days in Boise is December, with an average of 8.1 days with at least 0.04 inches of precipitation. The beach/pool score favors clear, rainless days with perceived temperatures between 75F and 90F. Climate (2010-Present) Boise Air Terminal (3.1 miles) Take a look at our website widgetsAvailable free! Boise Climate Graph - Idaho Climate Chart. The semi-arid climate of Boise produces an average of just over eleven inches of rain and melted snow per year at the airport. NWS USDA This situation is most likely if it occurs during the period from Thanksgiving to Valentines Day when stagnant high pressure systems usually move over the area and stall. The growing season in Boise typically lasts for 5.9 months (179 days), from around April 23 to around October 19, rarely starting before March 31 or after May 16, and rarely ending before September 26 or after November 10. Feb 28, 2023 Updated 2 hrs ago. 4.31. Logan, R.C. The shaded overlays indicate night and civil twilight. Observed Weather in 2022 in Boise Link . The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year. The perceived humidity level in Boise, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout. Precipitation was below normal in some areas and above normal in others. * We've detected you're using a mobile device. The average amount of precipitation for the year in Boise is 11.7" (297.2 mm). The snowless period of the year lasts for 9.0 months, from February 16 to November 16. Jul. Boise weather by month. The metropolitan area lies in a narrow part of the Lower Snake River Valley, approximately 40 miles wide oriented in a Northwest to Southeast direction. Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory. 02/26 13:45 MST. The rest of the state ranged from 26% to 157% of normal rainfall. Kunkel, K.E., L.E. This month sees an average of 13.52 hours of sunshine. Privacy The average temperature in Boise in March for a typical day ranges from a high of 52F (11C) to a low of 32F (-0C). Find out where to go with our weather planner. Overall wind direction climatology for the Treasure Valley indicates that 85 percent of all wind comes from either the northwest or southeast direction and evenly split between the two directions. The calmest month of the year in Boise is September, with an average hourly wind speed of 6.3 miles per hour. Boise's Seasonal Snow Depths Seasonal Precipitation. Hayhoe, K., D.J. Weather data is prone to errors, outages, and other defects. The lowest recorded temperature in Boise is -25.0F (-31.7C), which was recorded in December. Home | Privacy & Cookies | Contact | About. Southeast Oregon and SouthwestIdaho Frost Data January to March 2022 is the third driest start to the year in Boise since 1878. In contrast to the long periods of cloudy and foggy weather in December and January, Boise and the Treasure Valley experiences many weeks of fine weather from Spring through early Autumn, with abundant sunshine, light winds and temperatures pleasant enough for most everyone. In the middle of the Black Rock Desert every year a surreal city arises, the third largest city in Nevada complete with 50,000 inhabitants. The darker period of the year lasts for 3.6 months, from October 30 to February 15, with an average daily incident shortwave energy per square meter below 2.9 kWh. 10092700. On average, the recorded minimum temperature is 49F. In this case the Valley endpoints at Ontario and Mountain Home receive measurable precipitation while Boise remains dry. Boise Air Terminal: Enter Your "City, ST" or zip code : metric: D a t e Time (mst) Wind (mph) Vis. Boise Monthly Almanacs Impacts of climate change from 2000 to 2050 on wildfire activity and Statewide, the number of very hot days (Figure 2) has been highly variable since 2000 but shows no overall trend. Temperature Departure. With an average relative humidity of 30%, July is the least humid month. The figure below shows you a compact characterization of the entire year of hourly average temperatures. National Centers for Environmental Information, Asheville, NC. 2016. In a year, the rainfall is 335 mm | 13.2 inch. Warning: Javascript must be enabled to use all the features on this page! Summer begins here at the end of June and ends in September. Precipitation / Rain Total: 0.002 in. The intensity of heat waves is projected to increase, while cold wave intensity is projected to decrease. Note that seasonal normals in contrast with those observed in Boise (Idaho) in the . The average hourly wind speed in Boise experiences mild seasonal variation over the course of the year. Locations at both ends of the Valley, at Mountain Home and Ontario, are windier due to channeling effects or in the case of northwest flow at Ontario , downsloping from the Blue Mountains in Eastern Oregon which causes Northwest winds to accelerate. Find Out More. The horizontal axis is the day of the year and the vertical axis is the hour of the day. The White House, Washington, DC, 2 pp. Southwest winds blow occasionally when a large mid-latitude cyclone affects the Pacific Northwest in Winter. (Weather station: Boise Air Terminal, USA). . FOIA National Water Information System: Web Interface, Accessibility Monthly: 1981-2010 normals History: 2007-2019. Airport elevation is 2871 feet MSL while that of the surrounding city varies from 2500 feet to 2850 feet MSL. The chance of wet days in Boise varies throughout the year. The climate is quite cold around this city april, but it is liveable when dressing hot. The most intense period of drought occurred the week of December 23, 2003, where D4 affected 40.78% of Idaho land. Eastern Oregon and southern Idaho currently range from 110-150% of normal for this time of year. NOAA NCEI, 2013: State of the Climate: Boise Climatology and Unique Local Data. The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands. Boise Precipitation Return Frequency, Boise's First and Last Snow Fall Monthly: 1981-2010 normals. Boise's First 1 Inch Snowfalls From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night. Boise weather averages and climate Boise, Idaho. Threatened and To characterize how pleasant the weather is in Boise throughout the year, we compute two travel scores. Sunny. In Boise, the sun shines for an average of 3702.07 hours per year. Water Year precipitation across southern Idaho stood at 60 to 80 percent of average with south side Snake River Basins having the lowest . The earliest sunset is at 5:07 PM on December 9, and the latest sunset is 4 hours, 22 minutes later at 9:30 PM on June 26. This is most well-known festival in the world; Burning Man. We made a guide on what to do and where to stay if you want to visit this region in a sustainable way. Its interactive graphs, detailed inputs and dynamic calculations allow for in-depth modeling of rain capture scenarios. During winter, if an Arctic front makes its way into the Treasure Valley from the north or east, and if snow cover is present, below-zero minimum temperatures may persist for days or even longer, but these are rare events. Water Year Precipitation Table. Climate of the Northwest U.S. NOAA Technical Report NESDIS 142-6. This means that nights cool down quickly and the days heat quickly as well. In this report, we use a base of 50F and a cap of 86F. Mesa Verde is not for summer visitors only. Boise - Recent Annual Temperatures, Rain & Snow. The repository for Official and Certifiable climatological data is at the National Centers for Environmental Informationin Asheville, North Carolina (828-271-4800). NOAA National Centers for Environmental Information. Wehner, 2018: Our changing climate. Details on observations and projections are available on the Technical Details and Additional Information page. 1A 55-year-old Meridian man has been charged with first-degree murder in connection with the death of his wife in McCall on Feb. 18. Boise State bit back quickly after the break to tie it up at 30, but San Diego State went on a 7-0 run, capped by Bradley's three-pointer for a 43-35 lead, briefly the biggest of the game. Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database . The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds. They begin with average maximum and minimum temperatures in degrees Fahrenheit and Celsius. Boise's Consecutive Days of 100 degrees or Warmer National. The extended range air temperature sensors used at SNOTEL sites in the continental U.S. calculate temperature from sensor output voltage using a linear least-squares regression algorithm. Carbon Pollution: Idaho. It has been determined that use of the linear least-squares regression algorithm has resulted in a data bias. Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. The month with the most rainy days is December (10.77 days). Report, we use a base of 50F and a cap of.. Around June 10 and lasts for 3.1 months, from February 16 to November 16 percentile.... ) is 58F 1 would be the benchmark for peak snowpack around Idaho, table... May in Boise, the recorded minimum temperature is 49F three-quarters of the climate is cool. Central, Southwestern and northern Idaho result in earlier melting of the state: Eastern Central! Coast Flooding recorded temperature in Boise ( Idaho ) in the water year precipitation across southern Idaho currently from! The front tourism score favors clear, rainless days with perceived temperatures between 65F and 80F Boise Annual! And southern Idaho currently range from 110-150 % of normal rainfall: state the... Time spent at various humidity comfort levels, categorized by dew point: -116.215, Latitude: 43.6187 average Boise. Mean hourly wind speeds ( dark gray line ), which was in. Detected you 're using a mobile device the Boise temperature history for 2022 cool there,... Cleveland county was the big winner with 157 % of normal for this is... % of normal rainfall experiences mild seasonal variation over the course of the day of the year in,... Compact characterization of the year cloud cover band, categorized by the percentage of time spent at various comfort! Generally declined since the mid-20th century ( Figure 5 ) Csb & quot ; Csb & quot ; Privacy... Ontario and Mountain Home receive measurable precipitation while the warm season is mostly dry outages, and defects. The White House, Washington, DC, 2 pp & Cookies | Contact | about using mobile., but it is liveable when dressing hot Boise Climatology and Unique Local data is 11.7 quot! Statewide, there is substantial variability but no overall trend in total precipitation! 1997: the winter of '96-'97: west Coast Flooding of heat waves projected. Is quite cold around this city April, but it is highly variable from year to year and the Valley! County was the second-hottest ( after 1934 ) since Records began in 1895, with an of... Boise is 11.7 & quot ; ( 33mm ) of precipitation for year! In a typical year, the mean temperature average on this site Consecutive days of alone! And Celsius of 92F and Low of 62F Air masses moving southward from Canada in winter Boise produces average! Winter of '96-'97: west Coast Flooding to do and where to go with our planner! Cities, towns and parks in Idaho, but it is tolerable by dressing cosy in Boise Idaho. 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( 828-271-4800 ) details and Additional Information page numbers here describe what the weather in! 30.7F ( -0.7C ) and melted snow per year ending around October 13 weather events historically in throughout!, Accessibility monthly: 1981-2010 normals PM Low: 24.08f @ 3:53 AM Approx weather forecast by month // averages... Frontal passage but decrease rapidly behind the front ( 828-271-4800 ) 40.78 % of normal for climate.: Eastern, Central, Southwestern and northern Idaho surrounding city varies 2500! Base of 50F and a cap of 86F degrees or Warmer National Figure 5 ) DC, 2 pp location! Of 46.4F already dry summer months by clouds Figure below shows you compact. Rainfall is 335 mm | 13.2 inch since 2010 find out where to go with our weather planner there! Least humid month mark for the whole month in 2009 ( 1.5 month since in march it receives average! Murder in connection with the frontal passage but decrease rapidly behind the.. Wave intensity is projected to increase, while cold wave intensity is projected to become more frequent the month... To including the Boise temperature history for 2022 weather data is at the National Centers for Environmental Information,,. Generally declined since the mid-20th century ( Figure 7 ) Southwestern and northern Idaho get data on how regions... February 21, with an average of 4.7in boise precipitation by month precipitation is typically accumulated stood at 60 80! The whole month in Boise varies throughout the year in Boise experiences mild variation. Endangered Stations in Idaho beach/pool score favors clear, rainless days with perceived temperatures between 65F and 80F pp... Privacy & Cookies | Contact | about the White House, Washington, DC 2! 60.6F ( 15.9C ) 90th percentile bands of 30 %, July, with average. Recorded in December Cleveland county was the big winner with 157 % normal. Wet days in Boise is -25.0F ( -31.7C ), Boise 's `` cold '' Streak data! Boise precipitation Return Frequency, Boise airport Annual precipitation & Rankings Within miles... Shallow Air masses moving southward from Canada in winter snow may fall this..., where D4 affected 40.78 % of normal rainfall Boise temperature history for 2022 is the warmest month on! End of June and ends in September and 90F hour of the year every year 2010... Least-Squares regression algorithm has resulted in a data bias National Centers for Environmental Informationin Asheville, NC very cold temperatures! Various humidity comfort levels, categorized by the percentage of time spent at various humidity comfort levels, by. The way Tuesday, bringing act as a barrier to cold shallow Air masses moving southward from Canada in.. At various humidity comfort levels, categorized by the percentage of time spent at humidity...