Philadelphia falls in the humid subtropical climate zone. Summers are typically hot and muggy, fall and spring are generally mild, and winter is cold. Snowfall is variable, with some winters bringing moderate snow and others bringing some significant snowstorms. Annual snowfall averages 21 inches (534 mm). Precipitation is generally spread throughout the year, with eight to eleven wet days per month, at an average annual rate of 42 inches (1068 mm).
January lows average −4 °C and highs average 4 °C. The lowest officially recorded temperature was −24 °C on February 9, 1934, but temperatures below −18 °C occur only a few times a decade. July lows average 21 °C and highs average 30 °C, although heat waves accompanied by high humidity are frequent with highs above 35 °C and the heat index running as high as 43 °C. The highest recorded temperature was 41 °C on August 7, 1918. Early fall and late winter are generally driest, with February being the driest month, averaging only 2.74 inches (69.8 mm) of precipitation.
January lows average −4 °C and highs average 4 °C. The lowest officially recorded temperature was −24 °C on February 9, 1934, but temperatures below −18 °C occur only a few times a decade. July lows average 21 °C and highs average 30 °C, although heat waves accompanied by high humidity are frequent with highs above 35 °C and the heat index running as high as 43 °C. The highest recorded temperature was 41 °C on August 7, 1918. Early fall and late winter are generally driest, with February being the driest month, averaging only 2.74 inches (69.8 mm) of precipitation.
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