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===Climate=== [[File:Köppen Climate Types Idaho.png|left|thumb|300x300px|[[Köppen climate classification|Köppen climate types]] of Idaho, using 1991–2020 [[Climatological normal|climate normals]]]] Idaho's [[climate]] varies widely. Although the state's western border is about {{convert|330|mi|-1}} from the Pacific Ocean, the maritime influence is still felt in Idaho; especially, in the winter when cloud cover, [[humidity]], and [[precipitation (meteorology)|precipitation]] are at their maximum extent. This influence has a moderating effect in the winter where temperatures are not as low as would otherwise be expected for a northern state with predominantly high elevations.<ref>{{cite web | url = http://www.wrcc.dri.edu/narratives/IDAHO.htm | title = Climate of Idaho | website = WRCC | publisher = DRI | date = February 20, 1954 | access-date = July 30, 2010 | archive-url = https://web.archive.org/web/20110909133342/http://www.wrcc.dri.edu/narratives/IDAHO.htm | archive-date = September 9, 2011 | url-status = live }}</ref> In the panhandle, moist air masses from the coast are released as precipitation over the [[North Central Rockies forests]], creating the [[North American inland temperate rainforest]].<ref>{{cite web| last =Woodward| first = Susan L.| title = Inland Rainforests of the Northwest| publisher = Radford University| date= 2012–2015| url = https://php.radford.edu/~swoodwar/biomes/?page_id=2286| access-date = May 4, 2021}}</ref> The maritime influence is least prominent in the state's eastern part where the precipitation patterns are often reversed, with wetter summers and drier winters, and seasonal temperature differences are more extreme, showing a more semi-arid [[continental climate]].<ref>{{Cite web|url=https://wrcc.dri.edu/narratives/IDAHO.htm|title=Climate of Idaho|website=Western Regional Climate Center|access-date=February 20, 2018|archive-url=https://web.archive.org/web/20171120183856/https://wrcc.dri.edu/narratives/IDAHO.htm|archive-date=November 20, 2017|url-status=live}}</ref> Idaho can be hot, although extended periods over {{convert|98|°F|°C|abbr=on}} are rare, except for the lowest point in elevation, [[Lewiston, Idaho|Lewiston]], which correspondingly sees little snow. Hot summer days are tempered by the low relative humidity and cooler evenings during summer months since, for most of the state, the highest [[Day|diurnal]] difference in temperature is often in the summer.<ref>{{cite web |url= https://wrcc.dri.edu/narratives/IDAHO.htm |title= Climate of Idaho |website= WRCC—DRI |date= February 20, 1954 |access-date= January 23, 2017 |archive-url= https://web.archive.org/web/20170221052600/http://www.wrcc.dri.edu/narratives/IDAHO.htm |archive-date= February 21, 2017 |url-status= live }}</ref> Winters can be cold, although extended periods of bitter cold weather below zero are unusual. Idaho's all-time highest temperature of {{convert|118|F|C}} was recorded at [[Orofino, Idaho|Orofino]] on July 28, 1934; the all-time lowest temperature of {{convert|-60|F|C}} was recorded at [[Island Park Dam]] on January 18, 1943. {| class="wikitable" | colspan="13" style="text-align:center;background:#E8EAFA;" |Monthly normal high and low temperatures for various Idaho cities. (°F) |- ! style="background:#e5afaa; color:#000; height:17px;" | City ! style="background:#e5afaa; color:#000;" | Jan ! style="background:#e5afaa; color:#000;" | Feb ! style="background:#e5afaa; color:#000;" | Mar ! style="background:#e5afaa; color:#000;" | Apr ! style="background:#e5afaa; color:#000;" | May ! style="background:#e5afaa; color:#000;" | Jun ! style="background:#e5afaa; color:#000;" | Jul ! style="background:#e5afaa; color:#000;" | Aug ! style="background:#e5afaa; color:#000;" | Sep ! style="background:#e5afaa; color:#000;" | Oct ! style="background:#e5afaa; color:#000;" | Nov ! style="background:#e5afaa; color:#000;" | Dec |- ! style="background:#f8f3ca; color:#000; height:16px;" | Boise | style="text-align:center; background:#f8f3ca; color:#000;" | 38/24 | style="text-align:center; background:#f8f3ca; color:#000;" | 45/27 | style="text-align:center; background:#f8f3ca; color:#000;" | 55/33 | style="text-align:center; background:#f8f3ca; color:#000;" | 62/38 | style="text-align:center; background:#f8f3ca; color:#000;" | 72/46 | style="text-align:center; background:#f8f3ca; color:#000;" | 81/53 | style="text-align:center; background:#f8f3ca; color:#000;" | 91/59 | style="text-align:center; background:#f8f3ca; color:#000;" | 90/59 | style="text-align:center; background:#f8f3ca; color:#000;" | 79/50 | style="text-align:center; background:#f8f3ca; color:#000;" | 65/40 | style="text-align:center; background:#f8f3ca; color:#000;" | 48/31 | style="text-align:center; background:#f8f3ca; color:#000;" | 38/23 |- ! style="background:#c5dfe1; color:#000; height:16px;" | Lewiston | style="text-align:center; background:#c5dfe1; color:#000;" | 42/30 | style="text-align:center; background:#c5dfe1; color:#000;" | 47/32 | style="text-align:center; background:#c5dfe1; color:#000;" | 55/36 | style="text-align:center; background:#c5dfe1; color:#000;" | 62/41 | style="text-align:center; background:#c5dfe1; color:#000;" | 72/48 | style="text-align:center; background:#c5dfe1; color:#000;" | 79/54 | style="text-align:center; background:#c5dfe1; color:#000;" | 91/61 | style="text-align:center; background:#c5dfe1; color:#000;" | 90/60 | style="text-align:center; background:#c5dfe1; color:#000;" | 80/52 | style="text-align:center; background:#c5dfe1; color:#000;" | 63/42 | style="text-align:center; background:#c5dfe1; color:#000;" | 49/35 | style="text-align:center; background:#c5dfe1; color:#000;" | 41/30 |- ! style="background:#f8f3ca; color:#000; height:16px;" | Pocatello | style="text-align:center; background:#f8f3ca; color:#000;" | 33/16 | style="text-align:center; background:#f8f3ca; color:#000;" | 38/19 | style="text-align:center; background:#f8f3ca; color:#000;" | 49/27 | style="text-align:center; background:#f8f3ca; color:#000;" | 59/33 | style="text-align:center; background:#f8f3ca; color:#000;" | 68/40 | style="text-align:center; background:#f8f3ca; color:#000;" | 78/46 | style="text-align:center; background:#f8f3ca; color:#000;" | 88/52 | style="text-align:center; background:#f8f3ca; color:#000;" | 88/51 | style="text-align:center; background:#f8f3ca; color:#000;" | 76/42 | style="text-align:center; background:#f8f3ca; color:#000;" | 62/33 | style="text-align:center; background:#f8f3ca; color:#000;" | 45/24 | style="text-align:center; background:#f8f3ca; color:#000;" | 33/16 |- ! style="background:#c5dfe1; color:#000; height:16px;" | Orofino | style="text-align:center; background:#c5dfe1; color:#000;" | 38/25 | style="text-align:center; background:#c5dfe1; color:#000;" | 46/28 | style="text-align:center; background:#c5dfe1; color:#000;" | 55/32 | style="text-align:center; background:#c5dfe1; color:#000;" | 64/38 | style="text-align:center; background:#c5dfe1; color:#000;" | 72/44 | style="text-align:center; background:#c5dfe1; color:#000;" | 80/50 | style="text-align:center; background:#c5dfe1; color:#000;" | 89/54 | style="text-align:center; background:#c5dfe1; color:#000;" | 90/53 | style="text-align:center; background:#c5dfe1; color:#000;" | 79/45 | style="text-align:center; background:#c5dfe1; color:#000;" | 63/36 | style="text-align:center; background:#c5dfe1; color:#000;" | 46/31 | style="text-align:center; background:#c5dfe1; color:#000;" | 37/26 |- | colspan="13" style="text-align:center;font-size:90%;background:#E8EAFA;" |''<ref>{{Citation | title = Weather Idaho | url = http://www.ustravelweather.com/weather-idaho/ | publisher = US travel weather | url-status = dead | archive-url = https://web.archive.org/web/20070705032338/http://www.ustravelweather.com/weather-idaho/ | archive-date = July 5, 2007}}.</ref>'' |}
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