Standardized Precipitation Index Table

Southeast Climate Division

Iowa, Climate Division 09

Precipitation Data Table

Time Scale in Months (As of the end of Apr. 2026)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 6.42 8.87 8.96 9.62 11.37 12.54 14.16 15.79 17.49 27.59 32.11 35.03 40.84 46.67 68.09 84.27 99.64 127.53 163.88 200
Accumulated Precipitation Departure from Normal (in.) 3 3.09 1.9 1.22 1.38 0.5 -0.55 -2.68 -4.73 1.33 1.23 -0.07 -1.31 -0.5 -2.15 2 -5.71 -13.02 -11.93 -11.12
Accumulated Precipitation Percent of Average 188 153 127 115 114 104 96 86 79 105 104 100 97 99 97 102 95 91 93 95
Accumulated Precipitation Percentile (non-exceedance) 95.2 92.1 82.3 72.5 73.3 59.8 45.8 26 13.9 62.3 60.6 51.9 44.6 49.3 42.6 59.4 32.3 17.6 22.9 26.5
Standardized Precipitation Index 1.66 1.41 0.93 0.6 0.62 0.25 -0.1 -0.64 -1.09 0.31 0.27 0.05 -0.13 -0.02 -0.19 0.24 -0.46 -0.93 -0.74 -0.63