Standardized Precipitation Index Table

Northwest Plateau Climate Division

Pennsylvania, Climate Division 10

Precipitation Data Table

Time Scale in Months (As of the end of Jul. 2026)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 4.83 8.48 13.03 19.31 24.15 25.09 27.61 31.03 34.16 39 41.4 43.33 57.53 67.63 86.99 109.78 130.21 174.37 221.25 262.35
Accumulated Precipitation Departure from Normal (in.) 0.46 -0.25 0.33 2.93 4.4 2.79 2.21 2.34 2.04 3.38 2.09 0.23 1.73 2.25 0.76 1.29 0.84 1.84 5.56 3.48
Accumulated Precipitation Percent of Average 111 97 103 118 122 113 109 108 106 109 105 101 103 103 101 101 101 101 103 101
Accumulated Precipitation Percentile (non-exceedance) 66 48.8 57.6 83.2 90.7 79.5 74.6 75.2 71.1 79.5 69.6 53.4 63.1 65.5 55.2 57.1 54.5 57.1 66.6 59.7
Standardized Precipitation Index 0.41 -0.03 0.19 0.96 1.32 0.82 0.66 0.68 0.56 0.82 0.51 0.08 0.34 0.4 0.13 0.18 0.11 0.18 0.43 0.25