Climate Philadelphia

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according köppen climate classification, philadelphia falls under northern periphery of humid subtropical climate zone (köppen cfa), whereas according trewartha climate classification, city has temperate maritime climate (do). summers typically hot , muggy, fall , spring mild, , winter cold.


snowfall highly variable, winters consist of light snow while others consist of major snowstorms, normal seasonal snowfall standing @ 22.4 in (57 cm); snow in november or april rare , sustained snow cover rare. precipitation spread throughout year, 8 twelve wet days per month, @ average annual rate of 41.5 inches (1,050 mm), historically ranging 29.31 in (744 mm) in 1922 64.33 in (1,634 mm) in 2011. rain recorded in 1 day occurred on july 28, 2013, when 8.02 in (204 mm) fell @ philadelphia international airport.


the january daily average temperature 33.0 °f (0.6 °c), though, in normal winter, temperature rises 50 °f (10 °c) during thaws , dips 10 °f (−12 °c) 2 or 3 nights. july averages 78.1 °f (25.6 °c), although heat waves accompanied high humidity , heat indices frequent; highs reach or exceed 90 °f (32 °c) on 27 days of year. average window freezing temperatures november 6 thru april 2, allowing growing season of 217 days. fall , late winter dry; february s average precipitation of 2.64 inches (67 mm) makes area s driest month. dewpoint in summer averages between 59.1 °f (15 °c) 64.5 °f (18 °c).


seasonal snowfall accumulation has ranged trace amounts in 1972–73 78.7 inches (200 cm) in winter of 2009–10. city s heaviest single-storm snowfall, @ 30.7 in (78 cm), occurred in january 1996.


the highest recorded temperature 106 °f (41 °c) on august 7, 1918, temperatures @ or above 100 °f (38 °c) uncommon. lowest officially recorded temperature −11 °f (−24 °c) on february 9, 1934. temperatures @ or below 0 °f (−18 °c) rare last such occurrence being january 19, 1994. record low maximum 5 °f (−15 °c) on february 10, 1899, , december 30, 1880, while record high minimum 83 °f (28 °c) on july 23, 2011, , july 24, 2010.


in american lung association 2015 state of air report, philadelphia county received ozone grade of f , 24-hour particle pollution rating of c.






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