Standardized Precipitation Index Table

East Central Mountains Climate Division

Pennsylvania, Climate Division 02

Precipitation Data Table

Time Scale in Months (As of the end of Apr. 2026)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 3.11 9.4 10.43 12.91 15.66 17.37 20.97 23.09 25.02 29.36 33.91 44.1 52.45 60 78 107.8 137.48 182.69 235.88 284.7
Accumulated Precipitation Departure from Normal (in.) -0.81 1.71 -0.24 -1.13 -2.16 -4.06 -4.24 -6.37 -8.97 -9.37 -9.15 -3.19 -5.51 -8.81 -16.67 -8.46 -4.69 -6.86 -1.02 0.47
Accumulated Precipitation Percent of Average 79 122 98 92 88 81 83 78 74 76 79 93 90 87 82 93 97 96 100 100
Accumulated Precipitation Percentile (non-exceedance) 34.4 79.2 49.6 38.1 29.4 16.6 19.2 11.2 5.7 6.2 8.4 34.1 24 15.2 6.3 25 38.4 35.4 49.1 51.9
Standardized Precipitation Index -0.4 0.81 -0.01 -0.3 -0.54 -0.97 -0.87 -1.22 -1.58 -1.54 -1.38 -0.41 -0.71 -1.03 -1.53 -0.67 -0.3 -0.37 -0.02 0.05