Standardized Precipitation Index Table

South Central Mountains Climate Division

Pennsylvania, Climate Division 08

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.) 8.3 12.08 13.81 17.05 18.28 21.06 23.94 25.59 27.88 34.28 36.91 39.18 55.1 66.39 87.95 104.74 126.44 172.45 210.01 252.2
Accumulated Precipitation Departure from Normal (in.) 4.3 4.59 2.87 3.61 1.98 1.83 1.85 0.45 -0.66 2.11 0.79 -1.03 3.98 6.88 7.44 4.98 5.69 11.43 8.79 10.71
Accumulated Precipitation Percent of Average 207 161 126 127 112 110 108 102 98 107 102 97 108 112 109 105 105 107 104 104
Accumulated Precipitation Percentile (non-exceedance) 98.1 97.2 86.7 88.6 75.4 72.4 70.4 56.5 46.4 67.8 57.8 44.5 74.4 84.6 81.1 71.5 71.2 82.7 74.5 76.6
Standardized Precipitation Index 2.07 1.92 1.11 1.2 0.69 0.6 0.54 0.16 -0.09 0.46 0.2 -0.14 0.66 1.02 0.88 0.57 0.56 0.94 0.66 0.72