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 Mar. 2024)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 3.4 5.84 11.36 14.65 17.04 19.76 22.83 27.07 32.47 36.21 38.09 41.04 49.35 58.92 84.26 99.7 128.01 165.77 211.26 276.2
Accumulated Precipitation Departure from Normal (in.) -0.06 -0.12 2.54 2.91 2.44 2.1 1.76 2.39 3.83 3.47 1.39 0.88 0.39 1.04 3.87 1.56 7.38 4.93 10.21 34.95
Accumulated Precipitation Percent of Average 98 98 129 125 117 112 108 110 113 111 104 102 101 102 105 102 106 103 105 114
Accumulated Precipitation Percentile (non-exceedance) 53.7 51.4 89.6 88.9 81.1 74.8 69 71.9 79.4 76.3 61.9 58.1 54.2 57.5 68.8 57.8 76.5 66.6 77.6 98.8
Standardized Precipitation Index 0.09 0.03 1.26 1.22 0.88 0.67 0.49 0.58 0.82 0.72 0.3 0.2 0.1 0.19 0.49 0.2 0.72 0.43 0.76 2.27