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| | ===Climate=== | | ===Climate=== |
| | {{climate chart | | {{climate chart |
| − | | Philadelphia, Pennsylvania | + | | <!--- India ---> |
| − | |25.6|40.3|3.03 | + | | | | |
| − | |27.7|43.8|2.65 | + | | | | |
| − | |34.4|52.7|3.79 | + | | | | |
| − | |44.1|63.9|3.56 | + | | | | |
| − | |54.0|73.8|3.71 | + | | | | |
| − | |63.8|82.7|3.43 | + | | | | |
| − | |69.2|87.1|4.35 | + | | | | |
| − | |67.9|85.3|3.50 | + | | | | |
| − | |60.3|78.0|3.78 | + | | | | |
| − | |48.4|66.6|3.18 | + | | | | |
| − | |39.2|56.0|2.99 | + | | | | |
| − | |30.1|44.8|3.56 | + | | | | |
| − | |float=right | + | |maxprecip = <!--- supply largest monthly precipitation, in case it's > 750 mm (30 in.) ---> |
| − | |clear=both | + | |float = <!--- left, right, or none ---> |
| − | |units=imperial | + | |clear = <!--- left, right, both, or none ---> |
| | + | |units = <!--- set to "imperial" if the values are in °F and inches ---> |
| | + | |source = <!--- source of the data ---> |
| | }} | | }} |
| − | According to the [[Köppen climate classification]], Philadelphia falls under the northern periphery of the [[humid subtropical climate]] zone (Köppen ''Cfa''),<ref>{{cite web |url=http://www.weatherbase.com/weather/weather-summary.php3?s=80427&cityname=Philadelphia%2C+Pennsylvania%2C+United+States+of+America&units= |title=Climate Summary for Philadelphia, Pennsylvania |work=Weatherbase |accessdate=September 17, 2014}}</ref> whereas according to the [[Trewartha climate classification]], the city has a [[temperate]] [[maritime climate]] (''Do'') limited to the north by the [[continental climate]] (''Dc'').<ref>Trewartha GT, Horn LH (1980) Introduction to climate, 5th edn. McGraw Hill, New York, NY</ref> Summers are typically hot and muggy, fall and spring are generally mild, and winter is moderately cold. The [[plant]] life [[hardiness zone#U.S. cities|hardiness zones]] are 7a and 7b, representing an average annual extreme minimum temperature between {{convert|0|and|10|F|C}}.<ref>[http://planthardiness.ars.usda.gov/PHZMWeb/Images/All_states_halfzones_poster_300dpi.jpg "USDA Plant Hardiness Zone Map"]. ''usda.gov''. [[United States Department of Agriculture]]. Retrieved December 6, 2017. Note: high resolution map, may be slow to download.</ref>
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| − | Snowfall is highly variable with some winters having only light snow while others include major snowstorms. The normal seasonal snowfall averages {{convert|22.4|in|cm|0|abbr=on}}, with rare snowfalls in November or April, and rarely any sustained snow cover.<ref name="PhillyNOAA"/> Seasonal snowfall accumulation has ranged from trace amounts in 1972–73 to {{convert|78.7|in|cm|0}} in the winter of 2009–10.<ref name="PhillyNOAA"/>{{efn|See [[North American blizzard of 2009#Snowfall]] (December 19–20, 2009), [[February 5–6, 2010 North American blizzard#Snowfall]] (February 5–6, 2010), and [[February 9–10, 2010 North American blizzard#Impact]] (February 9–10, 2010). The February 2010 storms contributed to a single month record accumulation of {{convert|51.5|in|cm|0|abbr=on}}. If no snow fell outside of February that season, 2009–10 would still rank as 5th-snowiest. See the [https://web.archive.org/web/20000818012042/http://www.fi.edu/weather/data2/images/wthrsnow.jpg Franklin Institute] for a visual representation of seasonal snowfall.}} The city's [[North American blizzard of 1996#Philadelphia and Pennsylvania|heaviest single-storm snowfall]] was {{convert|30.7|in|cm|0|abbr=on}} which occurred in January 1996.<ref>{{Cite web|url=https://www.washingtonpost.com/blogs/capital-weather-gang/post/one-wild-storm-a-look-back-at-the-blizzard-of-96/2013/01/07/89a1242c-5875-11e2-9fa9-5fbdc9530eb9_blog.html|title=One wild storm: A look back at the ‘Blizzard of ‘96’|last=Lipman|first=Don|date=2013-01-07|website=Washington Post|language=en-US|access-date=2017-12-19}}</ref>
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| − | Precipitation is generally spread throughout the year, with eight to eleven wet days per month,<ref>{{cite web|url=http://www.met.utah.edu/jhorel/html/wx/climate/daysrain.html |title=Average Days of Precipitation, .01 Inches or more |accessdate=July 28, 2006 |deadurl=yes |archiveurl=https://web.archive.org/web/20060620130836/http://www.met.utah.edu/jhorel/html/wx/climate/daysrain.html |archivedate=June 20, 2006 }}</ref> at an average annual rate of {{convert|41.5|in|mm|sigfig=3}}, but historically ranging from {{convert|29.31|in|mm|abbr=on}} in 1922 to {{convert|64.33|in|mm|abbr=on}} in 2011.<ref name="PhillyNOAA"/> The most rain recorded in one day occurred on July 28, 2013 when {{convert|8.02|in|mm|0|abbr=on}} fell at [[Philadelphia International Airport]].<ref name="PhillyNOAA"/> Philadelphia has a moderately sunny climate with an average of 2,500 [[Sunshine duration|hours of sunshine]] annually, and a percentage of sunshine ranging from 47% in December to 61% in June, July, and August.<ref name=noaasun-Phily1961/>
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| − | The January daily average temperature<!--NOT monthly normal high!--> is {{convert|33.0|°F|1}},<ref name = "NOAA-txt-Phily1981" /> though the temperature frequently rises to {{convert|50|°F}} during thaws and dips to {{convert|10|°F}} for 2 or 3 nights in a normal winter.<ref name = "NOAA-txt-Phily1981" /> July averages {{convert|78.1|°F|1}},<ref name = "NOAA-txt-Phily1981" /> although heat waves accompanied by high humidity and [[heat index|heat indices]] are frequent, with highs reaching or exceeding {{convert|90|°F|0}} on 27 days of the year. The average window for freezing temperatures is November 6 thru April 2,<ref name="PhillyNOAA"/> allowing a growing season of 217 days. Early fall and late winter are generally dry with February having the lowest average precipitation at {{convert|2.64|in|0}}. The dewpoint in the summer averages between {{convert|59.1|and|64.5|°F|0}}.<ref name="PhillyNOAA"/>
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| − | The highest recorded temperature was {{convert|106|°F|0}} on August 7, 1918, but temperatures at or above {{convert|100|°F|0}} are not common.<ref name="philadelphia1"/>{{efn|The last occurrence of such a temperature was July 21, 2019.}} The lowest officially recorded temperature was {{convert|-11|°F|0}} on February 9, 1934.<ref name="philadelphia1">{{cite web |url=http://www.stormfax.com/phlminmax2.html |title=Philadelphia Record Highs and Lows |accessdate=April 3, 2007}}</ref> Temperatures at or below {{convert|0|°F|0}} are rare with the last such occurrence being [[1994 North American cold wave|January 19, 1994]].<ref name="PhillyNOAA"/> The record low maximum is {{convert|5|°F|0}} on February 10, 1899, and December 30, 1880, while the record high minimum is {{convert|83|°F|0}} on July 23, 2011, and July 24, 2010.
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| − | {{Philadelphia weatherbox}}
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