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. 2019)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 4.75 6.75 10.36 14.65 18.6 23.81 28.7 37.55 42.16 50.88 56.07 61.73 73.8 81.73 109.61 127.48 150.35 194.24 236.42 274.83
Accumulated Precipitation Departure from Normal (in.) 1.15 -0.33 0.72 2.02 2.92 4.99 6.64 11.94 12.84 17.33 18.27 19.87 22.31 21.01 25.97 24.95 24.94 27.05 27.43 24.01
Accumulated Precipitation Percent of Average 132 95 107 116 119 127 130 147 144 152 148 147 143 135 131 124 120 116 113 110
Accumulated Precipitation Percentile (non-exceedance) 80.1 46.9 64.9 79.5 85.2 93.3 96.1 99.7 99.6 99.9 99.9 99.9 100 99.9 99.9 99.8 99.2 98.9 98.3 95.9
Standardized Precipitation Index 0.84 -0.08 0.38 0.83 1.04 1.5 1.76 2.74 2.67 3.1 3.17 3.29 3.35 3.03 3.06 2.85 2.43 2.29 2.11 1.74