Climatological Data
Copyright © 1996-2008 STORMFAX, Inc.
Weather in Philadelphia at this hour !
Weather in Philadelphia the past 48 hours !
Philadelphia, PA
NWS/1971-2000 
AVERAGE TEMPERATURE
| Year | Jan | Feb | Mar | Apr | May | June | July | Aug | Sep | Oct | Nov | Dec |
| 55.3 °F | 32.3 | 34.8 | 43.2 | 53.1 | 63.5 | 72.3 | 77.6 | 76.3 | 68.8 | 57.2 | 47.1 | 37.4 |
AVERAGE HIGH TEMPERATURE
| Year | Jan | Feb | Mar | Apr | May | June | July | Aug | Sep | Oct | Nov | Dec |
| 63.2 °F | 39.0 | 42.1 | 51.3 | 62.0 | 72.1 | 80.6 | 85.5 | 84.0 | 76.7 | 65.7 | 54.8 | 44.2 |
AVERAGE LOW TEMPERATURE
| Year | Jan | Feb | Mar | Apr | May | June | July | Aug | Sep | Oct | Nov | Dec |
| 47.4 °F | 25.5 | 27.5 | 35.1 | 44.2 | 54.8 | 64.0 | 69.7 | 68.5 | 60.9 | 48.7 | 39.5 | 30.6 |
HIGHEST RECORDED TEMPERATURE (All-Time)
| Ever | Jan | Feb | Mar | Apr | May | June | July | Aug | Sep | Oct | Nov | Dec |
| 106 °F | 74 | 79 | 87 | 95 | 97 | 102 | 104 | 106 | 102 | 96 | 84 | 73 |
| When | 1950 | 1930 | 1945 | 2002 | 1991 | 1934 | 1966 | 1918 | 1881 | 1941 | 1950 | 1998 |
LOWEST RECORDED TEMPERATURE (All-Time)
| Ever | Jan | Feb | Mar | Apr | May | June | July | Aug | Sep | Oct | Nov | Dec |
| -11 °F | -7 | -11 | 5 | 14 | 28 | 44 | 51 | 44 | 35 | 25 | 8 | -5 |
| When | 1984 | 1934 | 1872 | 1923 | 1966 | 1984 | 1966 | 1986 | 1963 | 1969 | 1875 | 1880 |
MEAN NUMBER OF DAYS Below 32°F
| Total | Jan | Feb | Mar | Apr | May | June | July | Aug | Sep | Oct | Nov | Dec |
| 87 days | 25 | 21 | 13 | 2 | 0 | 0 | 0 | 0 | 0 | 1 | 7 | 19 |
NORMAL HEATING DEGREE DAYS
| Total | Jan | Feb | Mar | Apr | May | June | July | Aug | Sep | Oct | Nov | Dec |
| 4759 | 1020 | 858 | 681 | 362 | 113 | 12 | 1 | 2 | 39 | 269 | 545 | 857 |
NORMAL COOLING DEGREE DAYS
| Total | Jan | Feb | Mar | Apr | May | June | July | Aug | Sep | Oct | Nov | Dec |
| 1235 | 0 | 0 | 2 | 10 | 70 | 234 | 395 | 351 | 152 | 19 | 2 | 0 |
AVERAGE PRECIPITATION (Inches)
| Total | Jan | Feb | Mar | Apr | May | June | July | Aug | Sep | Oct | Nov | Dec |
| 42.05" | 3.52 | 2.74 | 3.81 | 3.49 | 3.89 | 3.29 | 4.39 | 3.82 | 3.88 | 2.75 | 3.16 | 3.31 |
AVERAGE SNOWFALL (Inches)
| Total | Jan | Feb | Mar | Apr | May | June | July | Aug | Sep | Oct | Nov | Dec |
| 19.3" | 6.4 | 6.6 | 3.2 | 0.6 | 0 | 0 | 0 | 0 | 0 | 0.1 | 0.4 | 2.0 |
AVERAGE WIND SPEED
| MPH | Jan | Feb | Mar | Apr | May | June | July | Aug | Sep | Oct | Nov | Dec |
| 9.6 | 10.3 | 10.9 | 11.4 | 10.9 | 9.5 | 8.8 | 8.2 | 7.9 | 8.3 | 8.9 | 9.6 | 10.1 |
AVERAGE DAYS of PRECIPITATION
| Total | Jan | Feb | Mar | Apr | May | June | July | Aug | Sep | Oct | Nov | Dec |
| 117 days | 11 | 9 | 11 | 11 | 11 | 10 | 9 | 9 | 8 | 8 | 9 | 10 |
PERCENT DAYS with SUNSHINE
| Total | Jan | Feb | Mar | Apr | May | June | July | Aug | Sep | Oct | Nov | Dec |
| 56 % | 49 | 53 | 55 | 55 | 56 | 62 | 61 | 62 | 59 | 59 | 52 | 49 |
MEAN NUMBER OF CLEAR DAYS
| Total | Jan | Feb | Mar | Apr | May | June | July | Aug | Sep | Oct | Nov | Dec |
| 93 days | 7 | 7 | 8 | 7 | 6 | 7 | 7 | 8 | 10 | 10 | 7 | 8 |
MEAN NUMBER OF PARTLY CLOUDY DAYS
| Total | Jan | Feb | Mar | Apr | May | June | July | Aug | Sep | Oct | Nov | Dec |
| 112 days | 8 | 7 | 8 | 9 | 11 | 12 | 12 | 11 | 9 | 9 | 9 | 8 |
MEAN NUMBER OF CLOUDY DAYS
| Total | Jan | Feb | Mar | Apr | May | June | July | Aug | Sep | Oct | Nov | Dec |
| 160 days | 16 | 14 | 15 | 14 | 14 | 11 | 12 | 12 | 11 | 12 | 14 | 15 |
AVERAGE MORNING Relative Humidity
| Year | Jan | Feb | Mar | Apr | May | June | July | Aug | Sep | Oct | Nov | Dec |
| 77 % | 74 | 73 | 73 | 71 | 75 | 77 | 78 | 81 | 83 | 83 | 78 | 75 |
AVERAGE AFTERNOON Relative Humidity
| Year | Jan | Feb | Mar | Apr | May | June | July | Aug | Sep | Oct | Nov | Dec |
| 55 % | 60 | 55 | 52 | 50 | 53 | 54 | 54 | 55 | 56 | 55 | 56 | 58 |
Normal/Record Daily Temperatures
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