Standardized Precipitation Index Table

South Central Climate Division

Iowa, Climate Division 08

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.) 3.83 7.65 12.66 15.22 18.03 18.24 20.21 21.34 22.35 26.22 32.51 37.44 54.72 62.18 86.66 103.18 116.49 148.34 186.53 234.11
Accumulated Precipitation Departure from Normal (in.) -0.11 -1.13 -0.5 -1.3 -0.56 -1.51 -0.62 -0.77 -1.62 -0.37 2.01 2.86 6.98 7.85 17.56 14.36 13.02 10.42 14.14 27.22
Accumulated Precipitation Percent of Average 97 87 96 92 97 92 97 97 93 99 107 108 115 114 125 116 113 108 108 113
Accumulated Precipitation Percentile (non-exceedance) 56.1 40.8 49.2 42.2 48.8 41.1 48.3 47.1 41 50.3 64.4 67.9 80 81.4 95.5 89.1 85.7 76.7 80.7 92.8
Standardized Precipitation Index 0.15 -0.23 -0.02 -0.2 -0.03 -0.22 -0.04 -0.07 -0.23 0.01 0.37 0.46 0.84 0.89 1.7 1.23 1.07 0.73 0.87 1.46