Editing Denver (section)

===Climate===
{{climate chart
|Denver
|19|45|0.4
|20|46|0.4
|28|56|0.9
|34|62|1.7
|44|71|2.2
|53|83|1.9
|60|90|2.1
|58|88|1.6
|50|80|1.4
|37|65|1.0
|26|53|0.6
|18|44|0.4
|units = imperial
|float = right
|clear = both}}
Denver features a [[continental semi-arid climate]] ([[Köppen climate classification]]: ''BSk'', [[Trewartha climate classification|Trewartha]]: ''BSao'') with generally low humidity and around 3,100 hours of sunshine per year, although humid [[microclimate]]s can be found nearby depending on exact location.<ref>{{Cite web|url=https://www.plantmaps.com/koppen-climate-classification-map-united-states.php|title=Interactive United States Koppen-Geiger Climate Classification Map|website=www.plantmaps.com|access-date=December 19, 2018}}</ref><ref>{{Cite web|url=https://people.eng.unimelb.edu.au/mpeel/koppen.html|title=Updated Köppen-Geiger climate map of the world|website=people.eng.unimelb.edu.au|access-date=December 19, 2018}}</ref> It has four distinct seasons and receives most of its precipitation from April through August. Due to its inland location on the [[High Plains (United States)|High Plains]], at the foot of the [[Rocky Mountains]], the region can be subject to sudden changes in weather.<ref>{{cite web |url=http://climate.colostate.edu/climate_long.html|title=Colorado Climate Center – Climate of Colorado|publisher=Climate.colostate.edu|access-date=July 13, 2012|url-status=dead|archive-url=https://web.archive.org/web/20120703034302/http://climate.colostate.edu/climateofcolorado.php|archive-date=July 3, 2012}}</ref>

July is the warmest month, with an average high temperature of {{convert|89.9|°F|1}}.<ref>{{Cite web|url=https://www.weather.gov/bou/july2015_denver_statpreview|title=A Statistical Preview of Denver's July Weather|first=NOAA|last=US Department of Commerce|website=www.weather.gov}}</ref> Summers range from warm to hot with occasional, sometimes severe, afternoon thunderstorms and high temperatures reaching {{convert|90|°F|0}} on 38 days annually, and occasionally {{convert|100|°F|0}}. December, the coldest month of the year, has an average daily high temperature of {{convert|44|°F|1}}. Winters consist of periods of snow and very low temperatures alternating with periods of milder weather due to the warming effect of [[Chinook wind]]s. In winter, daytime highs occasionally exceed {{convert|60|°F|0}}, but they also often fail to reach {{convert|32|°F|0}} during periods of cold weather. Occasionally, daytime highs can even fail to rise above {{convert|0|°F|0}} due to arctic air masses.<ref>{{cite web|url=http://www.thedenverchannel.com/weather/denver-s-10-longest-below-zero-streaks|title=Denver's 10 Longest Below Zero Streaks|date=January 13, 2007|access-date=December 30, 2018|archive-url=https://web.archive.org/web/20180629130943/https://www.thedenverchannel.com/weather/denver-s-10-longest-below-zero-streaks|archive-date=June 29, 2018|url-status=dead}}</ref> On the coldest nights of the year, lows can fall to {{convert|-10|°F|0}} or below, with the city experiencing a low of {{convert|-24|°F|0}} on December 22, 2022, with a wind chill of {{convert|-40|°F|0}}.<ref>[https://www.9news.com/article/weather/weather-colorado/denver-record-cold-2022/73-61ef19e7-f4cc-445c-a092-1018f35cccc1 Denver records coldest temperature since 1990] Denver News, December 22, 2022</ref> Snowfall is common throughout the late fall, winter and early spring, averaging {{convert|53.5|in|cm|0}} for 1981–2010;<ref name=NOAA2/> but in the 2021 winter season, Denver began the month of December without any snowfall for the first time in history.<ref>{{cite news |last1=Kerr |first1=Nicholas |title=Denver still waiting for 1st snow of season, breaking record |url=https://abcnews.go.com/US/denver-waiting-1st-snow-season-breaking-record/story?id=81467011 |access-date=1 December 2021 |publisher=ABC News |date=30 November 2021}}</ref> The average window for measurable (≥{{convert|0.1|in|cm|abbr=on|disp=or}}) snow is October 17 through April 27; however, measurable snowfall has occurred as early as September 4 and as late as June 3.<ref>{{cite web|url=http://www.almanac.com/content/frost-chart-united-states|title=Frost Chart for United States|access-date=December 27, 2012|publisher=The Old Farmer's Almanac}}</ref> Extremes in temperature range from {{convert|-29|°F}} on January 9, 1875, up to {{convert|105|°F}} as recently as June 28, 2018.<ref>{{cite web|url=https://twitter.com/NWSBoulder/status/1012435532201316355|title=NWS Boulder Twitter Account}}</ref> Due to the city's high elevation and aridity, [[diurnal temperature variation]] is large throughout the year.

[[Tornado]]es are rare west of the I-25 corridor; one notable exception was an [[Fujita scale|F3]] tornado that struck {{convert|4.4|mi|km}} south of downtown on June 15, 1988. On the other hand, the suburbs east of Denver and the city's east-northeastern extension ([[Denver International Airport]]) can see a few tornadoes, often weak [[landspout]] tornadoes, each spring and summer, especially during June, with the enhancement of the [[Denver Convergence Vorticity Zone]] (DCVZ). The DCVZ, also known as the Denver Cyclone, is a variable vortex of storm-forming air flow usually found north and east of downtown, and which often includes the airport.<ref>{{cite web|url=http://www.tornadohistoryproject.com/tornado/Colorado/Adams/map|title=Adams County, Colorado|publisher=Tornado History Project|access-date=April 7, 2016|archive-date=April 3, 2016|archive-url=https://web.archive.org/web/20160403132559/http://www.tornadohistoryproject.com/tornado/colorado/adams/map|url-status=usurped}}</ref><ref>{{cite book|title=The Tornado: Its Structure, Dynamics, Prediction, and Hazards|last=Church|first=Christopher R.|publisher=American Geophysical Union|year=1993|page=353|isbn=9780875900384}}</ref> Heavy weather from the DCVZ can disrupt airport operations.<ref>{{cite web |url=http://www.crh.noaa.gov/zdv/zdvtstms.pdf |archive-url=https://web.archive.org/web/20040711111538/http://www.crh.noaa.gov/zdv/ZDVTSTMS.pdf |archive-date=2004-07-11 |url-status=live|title=Denver Air Route Traffic Control Thunderstorm Patterns|last1=Meyer|first1=Thomas A.|last2=Bobb|first2=William R.|last3=Dulong|first3=Thomas W.|publisher=Denver Center Weather Service Unit, Longmont, Colorado. National Weather Service. National Oceanic and Atmospheric Administration.|access-date=May 22, 2014}}</ref><ref>{{cite news |url=http://www.chicagotribune.com/travel/ct-five-worst-weather-airports-denver,0,3838406.photo|title=Five Worst Weather Airports: Denver International Airport|date=November 23, 2011|work=Chicago Tribune}}</ref> In a study looking at [[hail]] events in areas with a population of at least 50,000, Denver was found to be ranked 10th most prone to hail storms in the [[continental United States]].<ref>{{cite news|url=http://www.insurancejournal.com/news/west/2011/09/16/216068.htm|title=Report: Colorado and Oklahoma Cities Dominate Top 10 Hail Prone Metro Areas|newspaper=Insurance Journal |date=September 16, 2011|access-date=September 18, 2015|author1=Admin }}</ref> In fact, Denver has had three of the top 10 [[list of costly or deadly hailstorms|costliest hailstorms]] in U.S. history, on July 11, 1990; July 20, 2009; and May 8, 2017.

Based on 30-year averages obtained from [[NOAA]]'s [[National Climatic Data Center]] for the months of December, January and February, [[Weather Channel]] ranked Denver the 18th-coldest major U.S. city {{As of|2014|lc=y}}.<ref>{{cite web|url=http://www.weather.com/sports-recreation/ski/news/20-coldest-large-cities-america-20140107|title=America's 20 Coldest Major Cities|author=John Erdman|publisher=The Weather Channel|date=January 27, 2014|access-date=January 9, 2015}}</ref>

Denver's official weather station is at Denver International Airport, roughly {{convert|20|mi}} from downtown. A 2019 analysis showed the average temperature at Denver International Airport, {{convert|50.2|°F|0}}, was significantly cooler than downtown, {{convert|53.0|°F|0}}. Many of the suburbs also have warmer temperatures and there is controversy regarding the location of the official temperature readings.<ref>{{cite web|last1=Bianchi |first1=Chris |title=Denver weather: How official measurements compare at DIA, downtown and Stapleton |url=https://www.denverpost.com/2019/04/12/denver-weather-measurement-site-comparison/ |website=The Denver Post |date=April 12, 2019 |access-date=August 3, 2020}}</ref>

{{Wide image|Denver Skyline in Winter.JPG|800px|View of downtown Denver after a snowstorm in March 2016, looking northwest from [[Cheesman Park, Denver|Cheesman Park]]}}

{{Denver weatherbox}}
{{Weather box
|location = Denver Water Department (elevation 5225 ft), 1991-2020 normals, extremes 1997-present
|single line = Y
|collapsed = Y
|Jan high F = 48.5
|Feb high F = 49.0
|Mar high F = 57.9
|Apr high F = 64.1
|May high F = 73.0
|Jun high F = 85.3
|Jul high F = 91.4
|Aug high F = 89.6
|Sep high F = 81.6
|Oct high F = 67.6
|Nov high F = 55.9
|Dec high F = 47.3
|year high F= 
|Jan low F = 21.3
|Feb low F = 21.7
|Mar low F = 29.6
|Apr low F = 36.2
|May low F = 45.9
|Jun low F = 55.8
|Jul low F = 61.8
|Aug low F = 60.1
|Sep low F = 50.7
|Oct low F = 37.7
|Nov low F = 27.6
|Dec low F = 20.6
|year low F=

|Jan record high F =  77
|Feb record high F =  78
|Mar record high F =  85
|Apr record high F =  91
|May record high F =  99
|Jun record high F = 107
|Jul record high F = 108
|Aug record high F = 104
|Sep record high F = 102
|Oct record high F =  90
|Nov record high F =  84
|Dec record high F =  76

|Jan record low F = -15
|Feb record low F = −14
|Mar record low F = −2
|Apr record low F =  8
|May record low F =  20
|Jun record low F =  36
|Jul record low F =  49
|Aug record low F =  40
|Sep record low F =  22
|Oct record low F =  4
|Nov record low F = -8
|Dec record low F = −13
|precipitation colour = green
|Jan precipitation inch = 0.43
|Feb precipitation inch = 0.60
|Mar precipitation inch = 1.13
|Apr precipitation inch = 1.98
|May precipitation inch = 2.65
|Jun precipitation inch = 1.73
|Jul precipitation inch = 1.90
|Aug precipitation inch = 1.81
|Sep precipitation inch = 1.20
|Oct precipitation inch = 1.16
|Nov precipitation inch = 0.78
|Dec precipitation inch = 0.48
|year precipitation inch= 
|Jan snow inch = 5.5
|Feb snow inch = 8.4
|Mar snow inch = 9.2
|Apr snow inch = 5.0
|May snow inch = 0.9
|Jun snow inch =   0
|Jul snow inch =   0
|Aug snow inch =   0
|Sep snow inch =   0
|Oct snow inch = 2.5
|Nov snow inch = 4.4
|Dec snow inch = 4.8
|year snow inch= 
|source 1 = [https://xmacis.rcc-acis.org xmACIS2]
}}

{{Weather box
|location = Central Park, Denver, 1991–2020 normals
|single line = Y
|collapsed = Y
|Jan high F = 46.5
|Feb high F = 47.5
|Mar high F = 56.4
|Apr high F = 62.5
|May high F = 71.7
|Jun high F = 84.1
|Jul high F = 90.2
|Aug high F = 87.9
|Sep high F = 80.1
|Oct high F = 66.7
|Nov high F = 54.8
|Dec high F = 45.9
|year high F = 66.2
|Jan low F = 17.6
|Feb low F = 19.3
|Mar low F = 27.1
|Apr low F = 33.7
|May low F = 43.4
|Jun low F = 52.9
|Jul low F = 59.3
|Aug low F = 57.2
|Sep low F = 48.2
|Oct low F = 35.7
|Nov low F = 25.5
|Dec low F = 17.7
|year low F = 36.5
|precipitation colour = green
|Jan precipitation inch = 0.46
|Feb precipitation inch = 0.53
|Mar precipitation inch = 1.12
|Apr precipitation inch = 1.67
|May precipitation inch = 2.29
|Jun precipitation inch = 1.68
|Jul precipitation inch = 2.12
|Aug precipitation inch = 1.83
|Sep precipitation inch = 1.51
|Oct precipitation inch = 0.98
|Nov precipitation inch = 0.70
|Dec precipitation inch = 0.47
|year precipitation inch = 15.36
|Jan snow inch = 6.4
|Feb snow inch = 7.6
|Mar snow inch = 8.8
|Apr snow inch = 6.2
|May snow inch = 1.4
|Jun snow inch = 0
|Jul snow inch = 0
|Aug snow inch = 0
|Sep snow inch = 0.8
|Oct snow inch = 3.9
|Nov snow inch = 7.3
|Dec snow inch = 6.6
|year snow inch= 49.0
|source 1=NOAA<ref name=NOAA2>{{cite web |url=https://www.ncei.noaa.gov/access/us-climate-normals/#dataset=normals-monthly&timeframe=30&station=USW00023062 |title=NOAA NCEI U.S. Climate Normals Quick Access |publisher=[[National Oceanic and Atmospheric Administration]] |access-date=2021-08-11}}</ref>
}}

{|style="width:100%;text-align:center;line-height:1.2em;margin-left:auto;margin-right:auto" class="wikitable mw-collapsible mw-collapsed"
|-
!Colspan=14|Climate data for Denver
|-
!Month
!Jan
!Feb
!Mar
!Apr
!May
!Jun
!Jul
!Aug
!Sep
!Oct
!Nov
!Dec
!style="border-left-width:medium"|Year
|-
!Mean daily daylight hours
|style="background:#F0F011;color:#000000;"|10.0
|style="background:#F7F722;color:#000000;"|11.0
|style="background:#FFFF33;color:#000000;"|12.0
|style="background:#FFFF44;color:#000000;"|13.0
|style="background:#FFFF55;color:#000000;"|14.0
|style="background:#FFFF66;color:#000000;"|15.0
|style="background:#FFFF66;color:#000000;"|15.0
|style="background:#FFFF55;color:#000000;"|14.0
|style="background:#FFFF33;color:#000000;"|12.0
|style="background:#F7F722;color:#000000;"|11.0
|style="background:#F0F011;color:#000000;"|10.0
|style="background:#E9E900;color:#000000;"|9.0
|style="background:#FFFF35;color:#000000;border-left-width:medium"|12.2
|-
!Average [[Ultraviolet index]]
|style="background:#289500;color:#000000;"|2
|style="background:#90bf00;color:#000000;"|3
|style="background:#f7e400;color:#000000;"|5
|style="background:#f8a000;color:#000000;"|7
|style="background:#f85900;color:#000000;"|9
|style="background:#6b49c8;color:#000000;"|11
|style="background:#6b49c8;color:#000000;"|11
|style="background:#f8001d;color:#000000;"|10
|style="background:#f8a000;color:#000000;"|7
|style="background:#f7e400;color:#000000;"|5
|style="background:#90bf00;color:#000000;"|3
|style="background:#289500;color:#000000;"|2
|style="background:#f8bf00;color:#000000;border-left-width:medium"|6.2
|-
|{{Graph:Weather monthly history
| table=ncei.noaa.gov/weather/Denver.tab
| title=Denver weather
}}
!Colspan=14 style="background:#f8f9fa;font-weight:normal;font-size:95%;"|Source: Weather Atlas<ref name="Weather Atlas">{{cite web|url=https://www.weather-us.com/en/colorado-usa/denver-climate|title=Denver, Colorado, USA – Monthly weather forecast and Climate data|publisher=Weather Atlas|access-date=February 26, 2019 }}</ref>
|}