Data Updated Nov 1. Monthly: 1981-2010 normals. Page Last Modified: 2023-03-01 21:54:59 EST The fog can become locally dense reducing visibility to less than one-quarter mile at the Boise Airport and vicinity. U.S. Department of Agriculture, Natural Page Contact Information: Idaho Water Data Maintainer The percentage of time spent at various humidity comfort levels, categorized by dew point. K. McElligott, J. Flannigan, and A.L. University of Idaho, Moscow, ID, 15 (since 1940), Boise's Yearly Total of 100 degree Days or Warmer However, a large range of temperature increases is projected under both pathways, and under the lower pathway, a few projections are only slightly warmer than historical records. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). On average, December is the wettest month with 1.5 inches (39 mm) of precipitation. National Resources Defense Council, New York, NY. including the Boise temperature history for 2022. Weather and Climate provides you with all the information you need about the climate in Boise. Snowfall January through April, November and December are months with snowfall. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. Get data on how different regions and populations experience temperature, precipitation, and extreme weather events historically. The month with the most precipitation on average is December with 1.6" (40.6 mm) of precipitation. Midwestern Regional Climate Center, Urbana-Champaign, IL. In this case, winds will be northwest until the high pressure system moves east of the city then winds shift southeast. The average amount of annual precipitation is: 11.8 inches (299 mm). 4.31. May Jun. Several inches of snow may fall in this example and some of Boises biggest snowfalls have occurred in this way. 28: 07:53: S 5: 10.00: Overcast: BKN055 OVC075: 32: . Tools Environment. Based on the tourism score, the best time of year to visit Boise for warm-weather activities is from late June to early September. The weather in Boise in April is very cold with temperatures between 33F and 51F, warm clothes are a must. On May 20, Jackson Lake, near the headwaters of the Snake River, was 23% full. This is the mean monthly precipitation over the year, including rain, snow, hail etc. Wind direction regime of the Treasure Valley and the city of Boise is a direct result of the northwest to southeast orientation of the Treasure Valley and the mountain ranges that border it. This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. Precipitation Data for Boise, ID 83705. Monthly: 1981-2010 normals. It also coincides with the coldest temperatures of the year and shortest period of daylight. The temperature in July averages 25.9 C | 78.6 F. 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. May Jun. https://waterdata.usgs.gov/id/nwis/current? 2022 Weather History in Boise Idaho, United States. Please try another search. 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 average temperature for the year in Boise is 52.5F (11.4C). You can jump to a separate table for each region of the state: Eastern, Central, Southwestern and Northern Idaho. Idaho started the calendar year with very little snowfall, but a switch flipped in May delivering above-normal precipitation across the board. Time/General. Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies. Dobson, 2013: Mickley, J.A. 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. Winter and spring precipitation is projected to increase during this century. The Boise Air Terminal known as Gowen Field is centered at 43 33.86N Latitude 116 13.37W Longitude. DST Changes. NOAA National Centers for Environmental Information (NCEI). 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. For print usage, please acquire a license. (1940-present), Boise Monthly Precipitation Extremes In Boise dense fog spreads over the city on light West to Northwest flow and usually occurs after a moist air mass has produced measurable rain or snow over the area. April is the last month it regularly snows in Boise. NOAA NCEI, 2013: State of the Climate: Station name. The K ppen Climate Classification subtype for this climate is "Csb". BEAR RIVER AT IDAHO-UTAH STATE LINE. MRCC, n.d.: cli-MATE: MRCC Application Redmond, and J.G. There is a difference of 50 mm | 2 inch of precipitation between the driest and wettest months. National Centers for Environmental Information, Asheville, NC. Change and Its Impacts Through Indicators. This fog is mostly advection fog meaning it moves here from some other place. These gusty outflow winds commonly peak at 35 mph and persist for a short time. Time (MST) Temp. Jay Lawrimore. National Oceanic and Atmospheric Administration, National Environmental NOAA NCEI, n.d.: Climate at a Glance: Please select one of the following: National Centers for Environmental Information, Boise's Yearly Total of 100 degree Days or Warmer, Boise's Consecutive Days of 100 degrees or Warmer, Boise's Yearly Total of 0 degree Days or Colder, Boise's Consecutive Days of 0 degrees or Colder, Boise's Daily Snowfall Records by Calendar Day, Southeast Oregon and SouthwestIdaho Frost Data, National Oceanic and Atmospheric Administration. The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands. Sun & Moon. 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. On average, August is the driest month with 0.2 inches (4 mm) of precipitation. Crouch 10092700. Climate Normals As with precipitation, Idahos temperature climate exhibits regional variation. The lowest recorded temperature in Boise is -25.0F (-31.7C), which was recorded in December. The windier part of the year lasts for 4.4 months, from February 8 to June 21, with average wind speeds of more than 6.9 miles per hour. Extreme weather cost the state more than $400 million in property damages in 2012 alone. Mountain Home, Climate-Data.org / AM OP / OpenStreetMap contributors, Weather by month // weather averages Boise. (since 1940), Boise City Total Monthly & Yearly Precipitation Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures ( 32F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere). Scattered clouds. Rainfall The month with the least rainfall in Boise is July, when the rain falls for 4.5 days and typically collects 0.2" (5mm) of precipitation. Weather Today Weather Hourly 14 Day Forecast Yesterday/Past Weather Climate (Averages) Currently: 37 F. Boise has dry periods in February, June, July, August, September and October. Title: USGS Current Conditions for Idaho Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 23% on November 11. Located in the heart of the Boise Valley and at an elevation of 2440-2470 feet, Nampa enjoys a mild climate year round. 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. For each station, the records are corrected for the elevation difference between that station and Boise according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations. Within 10 miles contains significant variations in elevation (3,980 feet). Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night. The chance of wet days in Boise varies throughout the year. . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid. Michael LeCompte, Digital Content Producer. The thermometer averaged maximum of 67F. The driest consecutive 5-year interval was 19281932, with an annual average of 20.1 inches, and the wettest was 19801984, with an annual average of 28.8 inches. NWS Temperature Departure. Southwest winds blow occasionally when a large mid-latitude cyclone affects the Pacific Northwest in Winter. The City of Boise is located in the Treasure Valley which is a part of the larger Snake River Valley of Southern Idaho. Local sources of surface water are the Boise River meandering through the city and the Snake River 20 miles to the south. Boise weather by month. Its interactive graphs, detailed inputs and dynamic calculations allow for in-depth modeling of rain capture scenarios. Precipitation data includes both calendar year . 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. The average hourly temperature, color coded into bands. Southeast Oregon and SouthwestIdaho Frost Data NOAA NCEI, n.d.: U.S. Freezing Precipitation is a rare event at Boise and the Treasure Valley due to the relative deepness of the Snake River Valley (about 2000 feet). Vast forests, bright blue freshwater lakes, dazzlingly tall sequoia trees and towering waterfalls are just a few hints to describe the Yosemite National Park. These data include quality controlled daily, monthly, seasonal, and yearly measurements of temperature, precipitation, wind, and degree days as well as radar data and 30-year Climate Normals. More Climate Data Boise. Data: 1991 - 2021 Min. NWS In January, average low temperature is colder in Boise (25.5F) than in Coeur DAlene (26.2F). ** 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 report . 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. The average hourly wind speed in Boise experiences mild seasonal variation over the course of the year. Projected rising temperatures will raise the snow linethe average lowest elevation at which the snow falls. On the Boise River in southwestern Idaho, it is 41 miles (66 km) east of the Oregon border and 110 miles (177 km) north of the Nevada border. Modify your browser's settings to allow Javascript to execute. Weather Highlights Multiple locations were found. With milder temperatures frequently in the Treasure Valley during the winter, snowfall is not as great as in other mid-latitude locations. This low condition hampers airport operations as well as traffic on the busy I-84 corridor from Boise to Meridian and west into Canyon County. 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. Even under a lower emissions pathway, annual average temperatures are projected to most likely exceed historical record levels by the middle of the century. Details on observations and projections are available on the Technical Details and Additional Information page. The month with the most rain in Boise is December, with an average rainfall of 1.5 inches. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. Heavy snowstorms are uncommon for Boise. The tourism score favors clear, rainless days with perceived temperatures between 65F and 80F. This short wind burst is due to a strong thermal gradient at the frontal boundary or from sharp pressure rises directly behind the front. Rain falls for 4.5 days and accumulates 0.2" (5mm) of . 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. The month with the least precipitation on average is August with an . Flood Awareness Guide for the Gem State. Common applications of snow survey products include water supply management, flood control, climate modeling, recreation, and conservation planning. 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 rainy period of the year lasts for 9.1 months, from September 18 to June 20, with a sliding 31-day rainfall of at least 0.5 inches. Sun & Moon. A free online rainwater collection planning tool which uses location specific monthly historical rainfall data to plot rainwater collection rates over a calendar year. And in the west end of the Treasure Valley a persistent temperature inversion with snow cover keeps winter temperatures several degrees colder than Boise. The number of hours during which the Sun is visible (black line). Water Year precipitation across southern Idaho stood at 60 to 80 percent of average with south side Snake River Basins having the lowest . DST Changes. Aug. The Boise River flows through Downtown Boise from east to west continuing through the Treasure Valley to a confluence with the Snake River at the Idaho Oregon State line. The transitions to and from daylight saving time are indicated by the 'DST' labels. A wet and cold spring means Idaho's water outlook is improving. In: Knowlton, K., 2015: Climate Change (January 1 - June 1). Throughout the year, in Boise, Idaho, there are 116.8 rainfall days, and 15.08" (383mm) of precipitation is accumulated. Air Dwpt 6 hour altimeter (in) sea level (mb) 1 hr 3 hr 6 hr; Max. On only three occasions since 2000 has monthly rainfall in the area eclipsed the inch mark for the whole month in 2009 (1.5 . The thin dotted line is the corresponding average snowfall. The black isolines are contours of constant solar elevation. Normally, milder temperatures are common in the Valley in winter often resulting in rain instead of snow. Boise Climatology and Unique Local Data. Low 23F. In contrast, the surrounding mountains get abundant snowfall in a normal year because of the higher elevation, colder temperatures and the mountain orographic wind flow effects producing these greater amounts of snow. Cooperative Institute for Satellite Earth System Studies (CISESS), Technical Details and Additional Information, https://nca2018.globalchange.gov/chapter/2/, https://www.nrdc.org/resources/climate-change-threatens-health, https://nesdis-prod.s3.amazonaws.com/migrated/NOAA_NESDIS_Tech_Report_142-6-Climate_of_the_Northwest_U.S.pdf, https://repository.library.noaa.gov/view/noaa/13812, http://www.ncdc.noaa.gov/sotc/fire/201213, https://www.ncdc.noaa.gov/cag/statewide/time-series/10/, https://www.ncei.noaa.gov/products/us-climate-normals, https://www.nrcs.usda.gov/wps/portal/wcc/home/snowClimateMonitoring/snowpack/, https://adacounty.id.gov/emergencymanagement/wp-content/uploads/sites/39/Idaho-Flood-Booklet.pdf, https://obamawhitehouse.archives.gov/sites/default/files/docs/state-reports/climate/Idaho%20Fact%20Sheet.pdf, https://www.nrcs.usda.gov/wps/portal/nrcs/detail/id/snow/products/?cid=nrcs144p2_047788. Jul. 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