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===Climate=== {{climate chart | Boise, Idaho |25.5|38.8|1.41 |29.0|46.0|1.00 |34.9|55.5|1.33 |39.6|62.3|1.23 |47.5|72.3|1.45 |54.1|81.4|0.75 |61.9|92.7|0.21 |60.8|90.7|0.17 |52.6|80.0|0.43 |41.5|64.8|0.81 |31.7|48.8|1.18 |25.4|38.8|1.54 |float=right |clear=both |units=imperial }} Boise has a [[semi-arid|cool semi-arid climate]] ([[Köppen climate classification]] ''[[Cold semi-arid climate|BSk]]'', [[Trewartha climate classification]] ''BSak''), with four distinct [[season]]s. Boise has similar temperatures and precipitation patterns as that of a [[Mediterranean climate]] (Koppen: ''Csa''). Boise experiences hot and dry summers with highs reaching {{convert|100|°F|0}} nine days in a typical year and {{convert|90|°F|0}} on 55 days.<ref name="NOWData NWS Boise, ID"/> Yet because of the aridity, average [[diurnal temperature variation]] exceeds {{convert|30|F-change}} in the height of summer. [[Winter]]s are moderately cold, with a December average of {{convert|32.1|°F|1}}, and lows falling to {{convert|0|°F|0}} or below on around one night per year, with some winters having several such readings and most having none at all.<ref name="NOWData NWS Boise, ID"/> Snowfall averages {{convert|18|in|cm|0}}, but typically falls in bouts of {{convert|3|in|cm|0}} or less.<ref name=NCDC>{{cite web |title=NCDC: U.S. Climate Normals |url=http://cdo.ncdc.noaa.gov/climatenormals/clim20/id/101022.pdf |url-status=dead |publisher=[[National Oceanic and Atmospheric Administration]] |access-date=May 15, 2010 |archive-url=https://web.archive.org/web/20140712144820/http://cdo.ncdc.noaa.gov/climatenormals/clim20/id/101022.pdf |archive-date=July 12, 2014 |df=mdy-all}}</ref> [[Spring (season)|Spring]] and [[Autumn|fall]] are mild. Extremes have ranged from {{convert|-28|°F|0}} on January 16, 1888, to {{convert|111|°F|0}} on July 12, 1898, and July 19, 1960;<ref name="NOWData NWS Boise, ID"/> temperatures have reached {{convert|-25|°F|0}} and {{convert|110|°F|0}} as recently as December 22, 1990, and August 10, 2018, respectively. [[Precipitation (meteorology)|Precipitation]] is usually infrequent and light, especially so during the summer months. It averages approximately {{convert|12|in|cm|0}} annually. Tornadoes are rare in Ada County and the Boise area. Since 1950, only twelve tornadoes have been documented within the county, and four of those were during the same storm on August 3, 2000, which is also the most recent date a tornado was documented in the area. None of the tornadoes have been ranked higher than an F1 on the [[Fujita scale]], and no injuries or fatalities were ever documented.<ref>{{cite web |title=Ada County, Idaho |url=http://www.tornadohistoryproject.com/tornado/Idaho/Ada/table |url-status=usurped |publisher=Tornado History Project |access-date=August 19, 2015 |archive-url=https://web.archive.org/web/20140820202406/http://www.tornadohistoryproject.com/tornado/Idaho/Ada/table |archive-date=August 20, 2014}}</ref> {{Weather box |location = [[Boise Airport]], Idaho (1991–2020 normals,{{efn|Mean monthly maxima and minima (i.e. the highest and lowest temperature readings during an entire month or year) calculated based on data at said location from 1991 to 2020.}} extremes 1875–present{{efn|Official records have been kept at downtown Boise from January 1875 to December 1939, and at Boise Air Terminal (Airport) since January 1940. For more information, see [http://threadex.rcc-acis.org/ ThreadEx].}}) |collapsed = yes |single line = Y |Jan record high F = 66 |Feb record high F = 71 |Mar record high F = 82 |Apr record high F = 92 |May record high F = 100 |Jun record high F = 110 |Jul record high F = 111 |Aug record high F = 110 |Sep record high F = 104 |Oct record high F = 94 |Nov record high F = 78 |Dec record high F = 70 |year record high F = 111 |Jan avg record high F = 52.6 |Feb avg record high F = 59.5 |Mar avg record high F = 71.0 |Apr avg record high F = 80.7 |May avg record high F = 90.1 |Jun avg record high F = 98.3 |Jul avg record high F = 104.5 |Aug avg record high F = 102.2 |Sep avg record high F = 95.9 |Oct avg record high F = 83.9 |Nov avg record high F = 65.0 |Dec avg record high F = 54.5 |year avg record high F = 105.2 |Jan high F = 38.8 |Feb high F = 46.0 |Mar high F = 55.5 |Apr high F = 62.3 |May high F = 72.3 |Jun high F = 81.4 |Jul high F = 92.7 |Aug high F = 90.7 |Sep high F = 80.0 |Oct high F = 64.8 |Nov high F = 48.8 |Dec high F = 38.8 |year high F = 64.3 |Jan mean F = 32.2 |Feb mean F = 37.5 |Mar mean F = 45.2 |Apr mean F = 50.9 |May mean F = 59.9 |Jun mean F = 67.8 |Jul mean F = 77.3 |Aug mean F = 75.8 |Sep mean F = 66.3 |Oct mean F = 53.2 |Nov mean F = 40.3 |Dec mean F = 32.1 |year mean F = 53.2 |Jan low F = 25.5 |Feb low F = 29.0 |Mar low F = 34.9 |Apr low F = 39.6 |May low F = 47.5 |Jun low F = 54.1 |Jul low F = 61.9 |Aug low F = 60.8 |Sep low F = 52.6 |Oct low F = 41.5 |Nov low F = 31.7 |Dec low F = 25.4 |year low F = 42.0 |Jan avg record low F = 10.0 |Feb avg record low F = 15.8 |Mar avg record low F = 22.8 |Apr avg record low F = 27.5 |May avg record low F = 33.0 |Jun avg record low F = 41.0 |Jul avg record low F = 50.4 |Aug avg record low F = 48.2 |Sep avg record low F = 38.4 |Oct avg record low F = 26.6 |Nov avg record low F = 17.4 |Dec avg record low F = 10.9 |year avg record low F = 5.1 |Jan record low F = −28 |Feb record low F = −15 |Mar record low F = 5 |Apr record low F = 11 |May record low F = 22 |Jun record low F = 30 |Jul record low F = 35 |Aug record low F = 32 |Sep record low F = 23 |Oct record low F = 11 |Nov record low F = −10 |Dec record low F = −25 |year record low F = -28 |precipitation colour = green |Jan precipitation inch = 1.41 |Feb precipitation inch = 1.00 |Mar precipitation inch = 1.33 |Apr precipitation inch = 1.23 |May precipitation inch = 1.45 |Jun precipitation inch = 0.75 |Jul precipitation inch = 0.21 |Aug precipitation inch = 0.17 |Sep precipitation inch = 0.43 |Oct precipitation inch = 0.81 |Nov precipitation inch = 1.18 |Dec precipitation inch = 1.54 |year precipitation inch = 11.51 |Jan snow inch = 5.3 |Feb snow inch = 3.3 |Mar snow inch = 1.2 |Apr snow inch = 0.1 |May snow inch = 0.0 |Jun snow inch = 0.0 |Jul snow inch = 0.0 |Aug snow inch = 0.0 |Sep snow inch = 0.0 |Oct snow inch = 0.1 |Nov snow inch = 2.0 |Dec snow inch = 5.6 |year snow inch = 17.6 |unit precipitation days = 0.01 in |Jan precipitation days = 11.1 |Feb precipitation days = 9.1 |Mar precipitation days = 10.1 |Apr precipitation days = 9.2 |May precipitation days = 8.4 |Jun precipitation days = 5.3 |Jul precipitation days = 2.3 |Aug precipitation days = 2.1 |Sep precipitation days = 3.9 |Oct precipitation days = 6.0 |Nov precipitation days = 9.7 |Dec precipitation days = 12.0 |year precipitation days = 89.2 |unit snow days = 0.1 in |Jan snow days = 5.2 |Feb snow days = 3.3 |Mar snow days = 1.6 |Apr snow days = 0.3 |May snow days = 0.0 |Jun snow days = 0.0 |Jul snow days = 0.0 |Aug snow days = 0.0 |Sep snow days = 0.0 |Oct snow days = 0.1 |Nov snow days = 2.2 |Dec snow days = 5.5 |year snow days = 18.2 |Jan sun = 109.3 |Jan percentsun = 38 |Feb sun = 151.9 |Feb percentsun = 52 |Mar sun = 238.6 |Mar percentsun = 64 |Apr sun = 281.4 |Apr percentsun = 70 |May sun = 335.5 |May percentsun = 74 |Jun sun = 351.6 |Jun percentsun = 76 |Jul sun = 399.8 |Jul percentsun = 86 |Aug sun = 358.8 |Aug percentsun = 83 |Sep sun = 303.6 |Sep percentsun = 81 |Oct sun = 238.1 |Oct percentsun = 70 |Nov sun = 119.6 |Nov percentsun = 41 |Dec sun = 105.2 |Dec percentsun = 38 |year percentsun = 67 |Jan humidity = 75.0 |Feb humidity = 69.9 |Mar humidity = 59.5 |Apr humidity = 52.3 |May humidity = 48.7 |Jun humidity = 44.7 |Jul humidity = 36.1 |Aug humidity = 37.2 |Sep humidity = 45.1 |Oct humidity = 53.6 |Nov humidity = 68.5 |Dec humidity = 74.6 |Jan dew point C = −5.8 |Feb dew point C = −3.4 |Mar dew point C = −2.6 |Apr dew point C = -1.0 |May dew point C = 2.2 |Jun dew point C = 5.2 |Jul dew point C = 6.2 |Aug dew point C = 5.7 |Sep dew point C = 3.3 |Oct dew point C = 0.4 |Nov dew point C = −1.7 |Dec dew point C = −5.3 |source 1 = NOAA (relative humidity, dew point, and sun 1961–1990<!--, percent sunshine thru 2009-->)<ref name="NOWData NWS Boise, ID">{{cite web |title=NowData – NOAA Online Weather Data |url=https://w2.weather.gov/climate/xmacis.php?wfo=boi |url-status=dead |publisher=[[National Oceanic and Atmospheric Administration]] |access-date=October 9, 2021 |archive-url=https://web.archive.org/web/20210507173712/https://w2.weather.gov/climate/xmacis.php?wfo=boi |archive-date=May 7, 2021}}</ref><ref>{{cite web |url=https://www.ncei.noaa.gov/access/services/data/v1?dataset=normals-monthly-1991-2020&startDate=0001-01-01&endDate=9996-12-31&stations=USW00024131&format=pdf |title = Summary of Monthly Normals 1991–2020 |publisher = [[National Oceanic and Atmospheric Administration]] |access-date = October 11, 2021 |archive-url = https://web.archive.org/web/20230803011003/https://www.ncei.noaa.gov/access/services/data/v1?dataset=normals-monthly-1991-2020&startDate=0001-01-01&endDate=9996-12-31&stations=USW00024131&format=pdf |archive-date = August 3, 2023}}</ref><ref name=NOAAsun >{{cite web |url = ftp://ftp.atdd.noaa.gov/pub/GCOS/WMO-Normals/TABLES/REG_IV/US/GROUP4/72681.TXT |title = WMO Climate Normals for BOISE/AIR TERMINAL ID 1961–1990 |publisher = National Oceanic and Atmospheric Administration |access-date = September 5, 2020 |archive-url = https://web.archive.org/web/20230803005737/ftp://ftp.atdd.noaa.gov/pub/GCOS/WMO-Normals/TABLES/REG_IV/US/GROUP4/72681.TXT |archive-date = August 3, 2023}}</ref> }} {{Graph:Weather monthly history | table=Ncei.noaa.gov/weather/Boise, Idaho.tab | title=Boise monthly weather statistics }}
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