Standardized Precipitation Index Table

Southeastern Piedmont Climate Division

Pennsylvania, Climate Division 03

Precipitation Data Table

Time Scale in Months (As of the end of May 2025)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 8.26 11.52 14.49 16.68 17.63 21.22 23.65 23.73 25.17 30.81 33.9 36.83 50.72 66.55 91.68 108.93 130.08 179.7 227.92 275.63
Accumulated Precipitation Departure from Normal (in.) 4.33 3.92 3.22 2.52 0.19 0.2 -0.64 -3.97 -6.49 -5.26 -6.68 -7.81 -5.17 0.81 2.26 -1.54 -4.06 0.81 4.35 7.4
Accumulated Precipitation Percent of Average 210 152 129 118 101 101 97 86 79 85 84 82 91 101 103 99 97 100 102 103
Accumulated Precipitation Percentile (non-exceedance) 97.7 95.3 88.9 81.6 54.7 54.5 46.5 20.4 10 18.2 13.3 11.1 24.2 55.7 60.2 45.6 38.3 53.3 60.9 65.4
Standardized Precipitation Index 2 1.67 1.22 0.9 0.12 0.11 -0.09 -0.83 -1.28 -0.91 -1.11 -1.22 -0.7 0.14 0.26 -0.11 -0.3 0.08 0.28 0.4