Standardized Precipitation Index Table

Central Mountains Climate Division

Pennsylvania, Climate Division 07

Precipitation Data Table

Time Scale in Months (As of the end of Jul. 2020)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 2.78 5.88 9.58 13.98 18.69 22.44 24.97 28.67 30.85 36.27 38.71 42.2 60.76 71.07 102.9 134.54 153.48 202.09 238.39 281.11
Accumulated Precipitation Departure from Normal (in.) -1.45 -2.61 -2.99 -2.2 -0.98 0.21 -0.25 0.37 -0.58 1.58 0.48 0.27 6.24 6.91 18.98 28.44 27.68 34.45 28.94 29.77
Accumulated Precipitation Percent of Average 66 69 76 86 95 101 99 101 98 105 101 101 111 111 123 127 122 121 114 112
Accumulated Precipitation Percentile (non-exceedance) 14.8 11.5 15 25.9 40.7 54.4 49.1 55.6 46.3 65 55.6 53.7 84.5 85.5 98.8 99.8 99.5 99.8 98.7 98.4
Standardized Precipitation Index -1.04 -1.2 -1.04 -0.64 -0.23 0.11 -0.02 0.14 -0.09 0.39 0.14 0.09 1.02 1.06 2.26 2.95 2.61 2.85 2.23 2.13