Standardized Precipitation Index Table

Southwest Climate Division

Iowa, Climate Division 07

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.) 3.95 6.3 10.94 12.92 15.18 15.27 16.35 17.27 18.02 22.88 29.89 34.36 49.93 56.03 79.17 97.13 111.59 148.32 195.41 240.99
Accumulated Precipitation Departure from Normal (in.) 0.05 -2.43 -2.16 -3.2 -2.83 -3.75 -3.51 -3.66 -4.48 -2.14 1.15 1.46 3.91 4.08 13.4 12.34 13.06 16.98 31.26 44.12
Accumulated Precipitation Percent of Average 101 72 84 80 84 80 82 83 80 91 104 104 108 108 120 115 113 113 119 122
Accumulated Precipitation Percentile (non-exceedance) 58.4 23.3 31.4 24.2 29.1 22.4 24.2 23.8 19.4 37.6 60 61.3 70.4 70 91.9 86.6 86.6 88.6 97.2 99.2
Standardized Precipitation Index 0.21 -0.73 -0.49 -0.7 -0.55 -0.76 -0.7 -0.71 -0.86 -0.32 0.25 0.29 0.54 0.52 1.4 1.11 1.11 1.21 1.91 2.4