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 Jul. 2020)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 3.29 5.9 8.37 13.39 18.03 20.84 24.08 27.65 29.22 33.71 35.47 39.45 54.93 65.85 99.77 132.39 149.27 194.59 228.03 266.24
Accumulated Precipitation Departure from Normal (in.) -0.67 -2.16 -3.64 -2.09 -0.93 -0.61 -0.23 0.41 -0.88 0.54 -1.08 -0.68 2.76 4.26 19.45 30.65 28.9 34.21 27.71 25.9
Accumulated Precipitation Percent of Average 83 73 70 86 95 97 99 102 97 102 97 98 105 107 124 130 124 121 114 111
Accumulated Precipitation Percentile (non-exceedance) 34.5 15.1 8 25.5 41 45.5 49.5 56.1 43.9 56.3 43.5 47 67.6 73.8 98.5 99.9 99.5 99.7 98.2 96.5
Standardized Precipitation Index -0.4 -1.03 -1.41 -0.66 -0.23 -0.11 -0.01 0.15 -0.15 0.16 -0.16 -0.07 0.46 0.64 2.18 3.05 2.58 2.77 2.1 1.81