Standardized Precipitation Index Table

Central Mountains Climate Division

Pennsylvania, Climate Division 07

Precipitation Data Table

Time Scale in Months (As of the end of Apr. 2020)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 4.38 9.05 12.8 15.33 19.03 21.21 26.63 29.07 32.56 37.89 44.4 51.12 61.43 74.91 112.83 132.83 160.71 201.45 245.34 287.52
Accumulated Precipitation Departure from Normal (in.) 0.77 1.95 3.14 2.67 3.32 2.37 4.54 3.43 3.22 4.31 6.55 9.19 9.86 14.08 28.95 30.06 35.02 33.98 36.05 36.4
Accumulated Precipitation Percent of Average 121 127 132 121 121 113 121 113 111 113 117 122 119 123 135 129 128 120 117 114
Accumulated Precipitation Percentile (non-exceedance) 73.4 84.1 90.2 85.5 87.9 77.9 89.3 81.5 77.9 81.3 89.6 94.9 94.4 98.1 99.9 99.9 99.9 99.7 99.6 99.4
Standardized Precipitation Index 0.63 1 1.29 1.06 1.17 0.77 1.24 0.9 0.77 0.89 1.26 1.63 1.59 2.08 3.24 3.24 3.19 2.76 2.66 2.53