Standardized Precipitation Index Table

Central Mountains Climate Division

Pennsylvania, Climate Division 07

Precipitation Data Table

Time Scale in Months (As of the end of Jan. 2026)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 1.99 4.41 6.87 10.65 13.49 15.04 18.41 24.44 31.99 35.72 37.71 41.01 47.84 58.74 82.84 106.52 126.64 172.29 218.67 258.78
Accumulated Precipitation Departure from Normal (in.) -0.99 -1.6 -2.25 -1.72 -2.43 -4.62 -5.5 -3.72 -0.27 -0.16 -1.64 -0.92 -3.34 -2.99 -1.13 2.69 0.59 4.15 8.45 6.48
Accumulated Precipitation Percent of Average 67 73 75 86 85 76 77 87 99 100 96 98 93 95 99 103 100 102 104 103
Accumulated Precipitation Percentile (non-exceedance) 23.6 19.9 15.9 27.6 23.6 10.4 9.9 22 49.9 50.6 39.5 45.2 29.8 34.2 45.5 62.5 53.4 64.4 73.9 67.7
Standardized Precipitation Index -0.72 -0.85 -1 -0.6 -0.72 -1.26 -1.29 -0.77 0 0.02 -0.27 -0.12 -0.53 -0.41 -0.11 0.32 0.08 0.37 0.64 0.46