Standardized Precipitation Index Table

Southeast Climate Division

Wisconsin, Climate Division 09

Precipitation Data Table

Time Scale in Months (As of the end of May 2025)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 3.47 6.02 9.6 10.34 10.51 11.47 14.43 15.58 17.82 21.36 26.12 32.39 47.24 52.68 71.22 85.44 106.91 135.92 165.45 209.76
Accumulated Precipitation Departure from Normal (in.) -0.01 -0.54 0.84 0.24 -1.11 -1.89 -1.12 -2.55 -3.82 -3.77 -2.49 -0.03 6.07 6.84 6.33 7.18 9.6 6.18 3.21 14.94
Accumulated Precipitation Percent of Average 100 92 110 102 90 86 93 86 82 85 91 100 115 115 110 109 110 105 102 108
Accumulated Precipitation Percentile (non-exceedance) 55.6 43.8 66.7 57.1 36 27.1 38.2 24.3 19 21.5 32.3 51.9 85.1 86.6 80 80.7 83.8 71.2 60.6 84.3
Standardized Precipitation Index 0.14 -0.15 0.43 0.18 -0.36 -0.61 -0.3 -0.7 -0.88 -0.79 -0.46 0.05 1.04 1.11 0.84 0.87 0.99 0.56 0.27 1.01