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Philadelphia Weather Data

 
"Official" weather data for Philadephia (that is, data that the National Weather Service feels is reliable enough to be used in its record-keeping) goes all the way back to 1872. That data is accessible, by year, below. Clicking on the letter "G" under each year accesses a graph of that year's daily high and low temperature data. The data set in its entirety (that is, not broken down by year) is also available.

At the bottom of the page, you'll find charts that show yearly weather data for the Philadelphia region back to the late 1800s.

The data files have seven columns:

  • Columns 1, 2 and 3 contain the month, day, and year.
  • Columns 4 and 5 are the daily high and low temperatures (in oF).
  • Column 6 is the daily precipitation (rain plus melted snow), in hundreths of an inch. For example, 5 is .05 inches, 62 is .62 inches, and 289 is 2.89 inches.
  • Column 7 is the daily snowfall, in tenths of inches. For example, 3 means ..3 inches, 51 means 5.1 inches, and 107 means 10.7 inches. 
In columns 6 and 7, the value -1 sometimes appears. This stands for a "trace" of precipitation, meaning that precipitation fell but it was too little to be measured. For liquid precipitation (column 6), this means less than 0.01 inches, while for snowfall (column 7), it means less than 0.1 inches. The value "-999" appears whenever data was not available or was not observed. 

      1880 data graph
      1881 data graph
1872 data   1882 data graph
1873 data   1883 data graph
1874 data graph 1884 data graph
1875 data graph 1885 data graph
1876 data graph 1886 data graph
1877 data graph 1887 data graph
1878 data graph 1888 data graph
1879 data graph 1889 data graph

1890 data graph 1900 data graph
1891 data graph 1901 data graph
1892 data graph 1902 data graph
1893 data graph 1903 data graph
1894 data graph 1904 data graph
1895 data graph 1905 data graph
1896 data graph 1906 data graph
1897 data graph 1907 data graph
1898 data graph 1908 data graph
1899 data graph 1909 data graph

1910 data graph 1920 data graph
1911 data graph 1921 data graph
1912 data graph 1922 data graph
1913 data graph 1923 data graph
1914 data graph 1924 data graph
1915 data graph 1925 data graph
1916 data graph 1926 data graph
1917 data graph 1927 data graph
1918 data graph 1928 data graph
1919 data graph 1929 data graph

1930 data graph 1940 data graph
1931 data graph 1941 data graph
1932 data graph 1942 data graph
1933 data graph 1943 data graph
1934 data graph 1944 data graph
1935 data graph 1945 data graph
1936 data graph 1946 data graph
1937 data graph 1947 data graph
1938 data graph 1948 data graph
1939 data graph 1949 data graph

1950 data graph 1960 data graph
1951 data graph 1961 data graph
1952 data graph 1962 data graph
1953 data graph 1963 data graph
1954 data graph 1964 data graph
1955 data graph 1965 data graph
1956 data graph 1966 data graph
1957 data graph 1967 data graph
1958 data graph 1968 data graph
1959 data graph 1969 data graph

1970 data graph 1980 data graph
1971 data graph 1981 data graph
1972 data graph 1982 data graph
1973 data graph 1983 data graph
1974 data graph 1984 data graph
1975 data graph 1985 data graph
1976 data graph 1986 data graph
1977 data graph 1987 data graph
1978 data graph 1988 data graph
1979 data graph 1989 data graph

1990 data graph2000datagraph
1991 data graph2001data graph
1992 data graph   
1993 data graph   
1994 data graph   
1995 data graph   
1996 data graph   
1997 data graph   
1998 data graph   
1999 data graph   

The following charts also illustrate weather trends in Philadelphia. The data used to create the charts is also available.

Annual Precipitation: chart | data

Winter Snowfall: chart | data

Annual Temperature: chart | data

Winter Temperature: chart | data

Summer Temperature: chart | data

 
 
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