Standardized Precipitation Index Table

Northwest Plateau Climate Division

Pennsylvania, Climate Division 10

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.) 3.39 5.2 10.18 13.29 15.38 19.09 21.17 25.6 31.59 35.28 37.22 40.03 50.81 60.52 85.22 107.18 135.62 172.61 226.68 280.02
Accumulated Precipitation Departure from Normal (in.) 0.02 -0.72 1.14 1 -0.34 -0.14 -1.75 -1.12 0.48 -0.2 -2.2 -3.02 -1.28 -1.82 -0.97 1.69 6.29 0.21 11.14 21.4
Accumulated Precipitation Percent of Average 100 88 113 108 98 99 92 96 102 99 94 93 98 97 99 102 105 100 105 108
Accumulated Precipitation Percentile (non-exceedance) 55.2 35.4 73.5 69 46.8 50.2 31.7 40.2 56.1 50.2 34.3 29 42.2 39.5 46 59.2 74.9 51.6 79.5 91.6
Standardized Precipitation Index 0.13 -0.37 0.63 0.5 -0.08 0 -0.48 -0.25 0.15 0.01 -0.4 -0.55 -0.2 -0.27 -0.1 0.23 0.67 0.04 0.82 1.38