Standardized Precipitation Index Table

East Central Climate Division

Iowa, Climate Division 06

Precipitation Data Table

Time Scale in Months (As of the end of Jul. 2020)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 3.86 9.46 13.96 16.08 19.42 19.92 21.57 22.86 24.51 28.63 36.06 40.11 54.61 64.14 92.29 112.66 122.35 163.99 205.84 242.6
Accumulated Precipitation Departure from Normal (in.) -0.07 0.9 1.28 0.09 1.18 0.44 0.84 0.55 0.13 1.67 5.37 5.52 7.35 10.07 23.15 24.07 18.76 25.86 33.21 35.5
Accumulated Precipitation Percent of Average 98 110 110 101 106 102 104 102 101 106 117 116 116 119 133 127 118 119 119 117
Accumulated Precipitation Percentile (non-exceedance) 55.1 65.9 67 54.3 63.6 56.9 60.1 57.4 53.7 65.1 82.3 82 84.2 89.3 99.2 98.6 95.2 97.4 98.6 98.5
Standardized Precipitation Index 0.13 0.41 0.44 0.11 0.35 0.17 0.26 0.19 0.09 0.39 0.93 0.91 1 1.24 2.42 2.19 1.66 1.94 2.19 2.18