Norman, Oklahoma

===Climate===
{{See also|List of Cleveland County, Oklahoma tornadoes}}
{{Weather box
|collapsed= 
|single line= Y
|location= Norman 1991–2020 normals, extremes 1894–present{{efn|For more information on the location of the site, see [https://xmacis.rcc-acis.org Threadex].}}
|Jan high F= 49.9
|Feb high F= 54.4
|Mar high F= 63.2
|Apr high F= 71.4
|May high F= 78.8
|Jun high F= 87.2
|Jul high F= 92.5
|Aug high F= 92.1
|Sep high F= 84.2
|Oct high F= 73.7
|Nov high F= 61.8
|Dec high F= 51.6
|year high F=71.7
<!--Mean daily temperature-->
|Jan mean F= 38.8
|Feb mean F= 42.9
|Mar mean F= 51.5
|Apr mean F= 59.8
|May mean F= 68.6
|Jun mean F= 77.3
|Jul mean F= 81.8
|Aug mean F= 81.2
|Sep mean F= 73.2
|Oct mean F= 62.0
|Nov mean F= 50.3
|Dec mean F= 41.1
|year mean F=60.7
|Jan low F= 27.7
|Feb low F= 31.3
|Mar low F= 39.8
|Apr low F= 48.2
|May low F= 58.4
|Jun low F= 67.3
|Jul low F= 71.2
|Aug low F= 70.2
|Sep low F= 62.2
|Oct low F= 50.3
|Nov low F= 38.8
|Dec low F= 30.6
|year low F=49.7
|Jan record high F= 81
|Feb record high F= 90
|Mar record high F= 97
|Apr record high F= 99
|May record high F= 102
|Jun record high F= 109
|Jul record high F= 112
|Aug record high F= 116
|Sep record high F= 107
|Oct record high F= 100
|Nov record high F= 91
|Dec record high F= 86
|year record high F=116
|Jan record low F= −9
|Feb record low F= −17
|Mar record low F= 1
|Apr record low F= 20
|May record low F= 28
|Jun record low F= 43
|Jul record low F= 52
|Aug record low F= 47
|Sep record low F= 32
|Oct record low F= 10
|Nov record low F= 5
|Dec record low F= −3
|year record low F= −17
|precipitation colour= green
|Jan precipitation inch= 1.37
|Feb precipitation inch= 1.60
|Mar precipitation inch= 2.80
|Apr precipitation inch= 3.48
|May precipitation inch= 5.14
|Jun precipitation inch= 4.79
|Jul precipitation inch= 3.71
|Aug precipitation inch= 3.61
|Sep precipitation inch= 3.68
|Oct precipitation inch= 3.43
|Nov precipitation inch= 2.04
|Dec precipitation inch= 2.00
|year precipitation inch=37.65
<!--Snowfall-->
|Jan snow inch= 1.2
|Feb snow inch= 1.2
|Mar snow inch= 0.2
|Apr snow inch= 0
|May snow inch= 0
|Jun snow inch= 0
|Jul snow inch= 0
|Aug snow inch= 0
|Sep snow inch= 0
|Oct snow inch= 0
|Nov snow inch= 0.5
|Dec snow inch= 1.0
|year snow inch=4.1
<!--Average number of precipitation days-->
|unit precipitation days= 0.01 in
|Jan precipitation days= 5.2
|Feb precipitation days= 5.8
|Mar precipitation days= 7.4
|Apr precipitation days= 8.0
|May precipitation days= 10.4
|Jun precipitation days= 9.2
|Jul precipitation days= 6.3
|Aug precipitation days= 7.0
|Sep precipitation days= 7.4
|Oct precipitation days= 7.2
|Nov precipitation days= 5.6
|Dec precipitation days= 5.9
|year precipitation days=85.4
<!--Average number of snowy days-->
|unit snow days= 0.1 in
|Jan snow days= 0.9
|Feb snow days= 1.3
|Mar snow days= 0.3
|Apr snow days= 0
|May snow days= 0
|Jun snow days= 0
|Jul snow days= 0
|Aug snow days= 0
|Sep snow days= 0
|Oct snow days= 0
|Nov snow days= 0.2
|Dec snow days= 1.2
|year snow days=4.0
<!--Mandatory fields, source-->
|source 1= [[National Oceanic and Atmospheric Administration|NOAA]]<ref name=NOWData>{{cite web |url=http://www.weather.gov/climate/xmacis.php?wfo=oun |title=NOWData |publisher=National Oceanic and Atmospheric Administration |access-date=June 1, 2021}}</ref><ref name= "NOAA txt">{{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=USC00346386&format=pdf |publisher=National Oceanic and Atmospheric Administration |title=Station: NORMAN 3SSE, OK US |work=U.S. Climate Normals 2020: U.S. Monthly Climate Normals (1991-2020) |access-date=June 1, 2021}}</ref>
}}

Norman falls within a [[temperate]], [[humid subtropical climate]] region that is identified as "Cfa" class on the [[Köppen climate classification]].<ref>{{cite web |url=http://snow.cals.uidaho.edu/clim_map/Köppen_usa_map.htm |publisher=University of Idaho |title=Köppen Climate Classification for the Conterminous United States |access-date=January 7, 2012}}{{dead link|date=December 2017 |bot=InternetArchiveBot |fix-attempted=yes }}</ref> On average Norman receives about {{cvt|38|in|mm}} of precipitation per year;<ref name="NOWData" /> May and June are the wettest months.<ref name="NOWData" /> Temperatures average {{cvt|61|°F|°C}} for the year.<ref name="Cleveland_Climate" /><ref name="NOWData" /> Average daytime highs range from {{cvt|50|°F|°C}} in January to {{cvt|92.5|°F|°C}} in July; average lows range from around {{cvt|28|°F|°C}} in January to {{cvt|71|°F|°C}} in July.<ref name="Cleveland_Climate" /><ref name="NOWData" /> Summers can be extremely hot, as was evident in the historically hot summer of 1980, and again in 2011, when temperatures climbed above {{cvt|100|°F|°C}} over most days from mid-June through early September<ref name="NOWData" /><ref>{{cite web |url=http://normantranscript.com/x1552632446/Heat-wave-continues-as-Oklahoma-death-toll-hits-15 |publisher=Norman Transcript |title=Heat wave continues as Oklahoma death toll hits 15 |access-date=January 7, 2012 |url-status=dead |archive-url=https://web.archive.org/web/20130613221746/http://normantranscript.com/x1552632446/Heat-wave-continues-as-Oklahoma-death-toll-hits-15 |archive-date=June 13, 2013 |df=mdy-all}}</ref> Consistent winds, averaging near {{cvt|10|mph|km/h}} and usually from the south to southeast, help to temper hotter weather during the summer and intensify cold periods during the winter.<ref name="Cleveland_Climate" />

[[File:Cloud-to-ground lightning2 - NOAA.jpg|thumb|left|Lightning strikes Norman during a nighttime thunderstorm]]

The average growing season in Norman is 209 days, but plants that can withstand short periods of colder temperatures may have an additional three to six weeks.<ref name="Cleveland_Climate" /> Winter months tend to be cloudier than those in summer, with the percentage of possible sunshine ranging from an average of about 55% in winter to nearly 80% in summer.<ref name="Cleveland_Climate" />

Norman lies within an area colloquially referred to as "[[Tornado Alley]]", a region of the United States known for frequent tornadic activity, and the [[Oklahoma City metropolitan area]], which encompasses Norman, is known for being one of the more tornado-prone areas in the United States.<ref name="Tornado_Alley">{{cite web |title=What is Tornado Alley? |url=http://www.spc.noaa.gov/faq/tornado/index.html#alley1 |access-date=January 7, 2012 |publisher=NOAA}}</ref><ref name="Tornado2">{{cite web |title=Tornadoes in the Oklahoma City, Oklahoma Area Since 1890 |url=https://www.weather.gov/oun/tornadodata-okc |access-date=June 26, 2023 |publisher=National Weather Service}}</ref> The risk for tornadoes is greatest in the springtime months of March through June when the majority of all reported tornadoes occur.<ref name="Tornado2" /> Severe weather, including tornadoes, still occurs outside this range. Notably, a high-end [[Enhanced Fujita scale|EF2 tornado]] tore through the southeastern side of Norman on the night of [[February 2023 North American storm complex|February 26, 2023]], passing within a mile of the NWC.<ref>{{Cite web |last=US Department of Commerce |first=NOAA |title=The Severe Weather and Tornado Outbreak of February 26, 2023 |url=https://www.weather.gov/oun/events-20230226 |access-date=2023-06-26 |website=National Weather Service |language=EN-US}}</ref> There have been several other tornado events in recent years. On [[Tornado outbreak of May 10–13, 2010|May 10, 2010]], numerous tornadoes occurred in [[Cleveland County, Oklahoma|Cleveland County]], resulting in the loss of multiple homes and businesses within Norman city limits. Weak tornadoes also struck Norman on [[Tornado outbreak of April 13–16, 2012|April 13, 2012]] and [[Tornado outbreak sequence of May 5–10, 2015|May 6, 2015]].<ref>{{cite web |url=http://normantranscript.com/local/x433568766/Several-businesses-damaged-by-Monday-tornado |publisher=The Norman Transcript |title=Several businesses damaged by Monday tornado |access-date=May 16, 2010 |url-status=dead |archive-url=https://archive.today/20120714183439/http://normantranscript.com/local/x433568766/Several-businesses-damaged-by-Monday-tornado |archive-date=July 14, 2012 |df=mdy-all}}</ref><ref>{{cite web |url=http://normantranscript.com/headlines/x433567446/Tornadoes-rated-EF2-EF3 |publisher=The Norman Transcript |title=Tornadoes rated EF2, EF3 |access-date=May 16, 2010 |url-status=dead |archive-url=https://archive.today/20120712183111/http://normantranscript.com/headlines/x433567446/Tornadoes-rated-EF2-EF3 |archive-date=July 12, 2012 |df=mdy-all}}</ref>

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