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Γραμμή 99:
Of Oklahoma's federally protected park or recreational sites; the [[Chickasaw National Recreation Area]] is the largest, with 9,898.63 acres (18 km<sup>2</sup>).<ref>{{cite web |publisher=National Park Service| accessdate=2010-01-16 | url=http://www.nps.gov/chic/parkmgmt/statistics.htm| title=Chickasaw National Recreation Area – Park Statistics}}</ref> Other sites include the [[Santa Fe National Historic Trail|Santa Fe]] and [[Trail of Tears]] national historic trails, the [[Fort Smith National Historic Site|Fort Smith]] and [[Washita Battlefield National Historic Site|Washita Battlefield]] national historic sites, and the [[Oklahoma City National Memorial]].<ref name="Oklahoma national parks"/>
=== Climate ===
Oklahoma is located in a [[temperate climate|temperate]] region and experiences occasional extremes of temperature and precipitation typical of a [[continental climate]].<ref name="Climate of OK" /> Most of the state lies in an area known as [[Tornado Alley]] characterized by frequent interaction between cold and warm air masses producing [[severe weather]].<ref name="The Climate of Oklahoma"/> An average 54 [[tornado]]es strike the state per year—one of the highest rates in the world.<ref name="Annual average number of tornadoes">{{cite web | publisher=NOAA National Climatic Data Center | accessdate=2006-10-24 | url=http://www.ncdc.noaa.gov/oa/climate/severeweather/tornadoes.html | title=Tornado Climatology}}</ref>
Because of Oklahoma's position between zones of differing prevailing temperature and winds, weather patterns within the state can vary widely between relatively short distances and can change drastically in a short time.<ref name="The Climate of Oklahoma"/> As an example, on November 11, 1911, the temperature at Oklahoma City reached {{convert|83|°F|°C|abbr=on}} in the afternoon (the record high for that date), then an incoming squall line resulted in a drop to {{convert|17|°F|°C|abbr=on}} at midnight (the record low for that date); thus, both the record high and record low for November 11 were set on the same day.<ref>http://www.mesonet.org/index.php/news/article/november_11_1911_a_palindrome_to_remember</ref>
[[Image:Lightning over Tulsa cropped.jpg|thumb|250px|Oklahoma's climate is prime for the generation of [[thunderstorm]]s.]]
The [[humid subtropical climate]] (Koppen ''Cfa'') of the eastern part of Oklahoma influenced heavily by southerly winds bringing moisture from the [[Gulf of Mexico]], but transitions progressively to a [[semi-arid]] zone (Koppen ''BSk'') in the high plains of the Panhandle and other western areas from about [[Lawton, Oklahoma|Lawton]] westward less frequently touched by southern moisture.<ref name="Climate of OK"/> Precipitation and temperatures fall from east to west accordingly, with areas in the southeast averaging an annual temperature of 62 °F (17 °C) and an annual rainfall of {{convert|56|in|mm|-1}}, while areas of the panhandle average 58 °F (14 °C), with an annual rainfall under {{convert|17|in|mm|-1}}.<ref name="The Climate of Oklahoma"/>
All of the state frequently experiences temperatures above 100 °F (38 °C) or below 0 °F (−18 °C),<ref name="Climate of OK">{{cite web | publisher=University of Oklahoma| accessdate=2007-08-01 | url=http://climate.mesonet.org/county_climate/Products/oklahoma_climate_overview.pdf| title=Oklahoma's Climate: an Overview|format=PDF}}</ref> and snowfall ranges from an average of less than {{convert|4|in|cm|0}} in the south to just over {{convert|20|in|cm|0}} on the border of [[Colorado]] in the panhandle.<ref name="The Climate of Oklahoma"/> The state is home to the [[Storm Prediction Center]], the [[National Severe Storms Laboratory]], and the [[Warning Decision Training Branch]], all part of the [[National Weather Service]] and located in [[Norman, Oklahoma|Norman]].<ref>{{cite web | first=Chris|last=Novy|publisher=[[NOAA]] | accessdate=2007-08-01 | url=http://www.spc.noaa.gov/misc/about.html| title=SPC and its Products}}</ref> Oklahoma's highest recorded temperature of {{convert|120|F|C}} was recorded at [[Tipton, Oklahoma|Tipton]] on June 27, 1994 and the lowest recorded temperature of {{convert|-31|F|C}} was recorded at [[Nowata, Oklahoma|Nowata]] on February 10, 2011.
{| class="wikitable" style="margin: 1em auto 1em auto" "text-align:center;font-size:90%;" |
| colspan="13" style="text-align:center;font-size:90%;background:#E5AFAA;"|'''Monthly temperatures for Oklahoma's largest cities'''
|- style="background: #E5AFAA;text-align:center;"
! City
! Jan
! Feb
! Mar
! Apr
! May
! Jun
! Jul
! Aug
! Sep
! Oct
! Nov
! Dec
|- style="background: #F8F3CA;text-align:center;"
! style="background:#f8f3ca; color:#000;"| Oklahoma City
| 47/26
| 54/31
| 62/39
| 71/48
| 79/58
| 87/66
| 93/71
| 92/70
| 84/62
| 73/51
| 60/38
| 50/29
|- style="background: #C5DFE1;text-align:center;"
! style="background:#c5dfe1; color:#000;"| Tulsa
| 46/26
| 53/31
| 62/40
| 72/50
| 80/59
| 88/68
| 94/73
| 93/71
| 84/63
| 74/51
| 60/39
| 50/30
|- style="background: #F8F3CA;text-align:center;"
! style="background:#f8f3ca; color:#000;"| Lawton
| 50/26
| 56/31
| 65/40
| 73/49
| 82/59
| 90/68
| 96/73
| 95/71
| 86/63
| 76/51
| 62/39
| 52/30
|-
| colspan="13" style="text-align:center; font-size:90%; background:#e8eafa; text-align:center; font-size:90%; background:#e8eafa;"| ''Average high/low temperatures in ''°F''<ref>{{cite web |year=2007|publisher=UStravelweather.com | accessdate=2007-08-02 | url=http://www.ustravelweather.com/weather-oklahoma| title=Oklahoma Weather And Climate|archiveurl = http://web.archive.org/web/20070927001532/http://www.ustravelweather.com/weather-oklahoma |archivedate = September 27, 2007|deadurl=yes}}</ref><ref>{{cite web |publisher=MSN Weather| accessdate=2007-08-13 | url=http://weather.msn.com/monthly_averages.aspx?wealocations=wc:USOK0307| title=Weather Averages: Lawton, Oklahoma}}</ref>''
|}
== Οικονομία ==
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