Standardized Precipitation Index Table

Northern Climate Division

Delaware, Climate Division 01

Precipitation Data Table

Time Scale in Months (As of the end of Nov. 2025)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 2.13 4.46 6.57 8.17 14.34 17.27 24.31 28.15 32.08 34.27 35.37 38.69 41.9 54.2 83.61 109.28 126.27 164.85 207.58 259.99
Accumulated Precipitation Departure from Normal (in.) -0.99 -1.85 -3.43 -6.19 -4.44 -5.42 -2.05 -1.81 -1.7 -2.48 -4.71 -5.04 -11.85 -12.26 -3.92 -1.04 -5.08 -10.31 -11.44 -2.92
Accumulated Precipitation Percent of Average 68 71 66 57 76 76 92 94 95 93 88 88 78 82 96 99 96 94 95 99
Accumulated Precipitation Percentile (non-exceedance) 32.2 24.4 14 3.7 15.5 12.7 36.9 39.1 39.9 35.2 22.1 21.7 4.8 7.1 35.2 47.6 34.1 22.2 22.8 44.1
Standardized Precipitation Index -0.46 -0.69 -1.08 -1.79 -1.01 -1.14 -0.33 -0.28 -0.25 -0.38 -0.77 -0.78 -1.67 -1.47 -0.38 -0.06 -0.41 -0.77 -0.74 -0.15