Standardized Precipitation Index Table

West Central Climate Division

Iowa, Climate Division 04

Precipitation Data Table

Time Scale in Months (As of the end of Mar. 2024)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 2.67 2.9 4.21 6.1 6.29 9.53 11.89 15.39 18.56 21.17 23.83 25.77 30.82 33.77 50.98 59.48 77.53 100.68 137.03 177.37
Accumulated Precipitation Departure from Normal (in.) 0.92 0.22 0.73 1.65 0.45 1.51 0.53 0.18 -0.29 -2.29 -3.76 -4.67 -3.1 -4.72 -9.98 -9.44 -13.91 -21.32 -15.63 -5.93
Accumulated Precipitation Percent of Average 152 108 121 137 108 119 105 101 98 90 86 85 91 88 84 86 85 83 90 97
Accumulated Precipitation Percentile (non-exceedance) 81.9 62.7 74.3 85.8 62.9 74.6 60 55.1 50.3 33.2 25.1 21.3 32 24.6 12 14.9 8.9 3.8 13.5 36.4
Standardized Precipitation Index 0.91 0.32 0.65 1.07 0.33 0.66 0.25 0.13 0.01 -0.43 -0.67 -0.8 -0.47 -0.69 -1.17 -1.04 -1.35 -1.77 -1.1 -0.35