Standardized Precipitation Index Table

Northwest Climate Division

Iowa, Climate Division 01

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.) 2.48 2.72 3.75 5.65 5.75 11.09 12.76 17.1 19.53 22.92 26.31 27.93 33.1 36.76 51.88 59.71 78.18 98.94 137.72 181.57
Accumulated Precipitation Departure from Normal (in.) 0.89 0.3 0.66 1.7 0.53 3.88 2.38 3.14 2.02 0.99 0.45 -0.6 1.48 1.01 -5.23 -4.55 -7.49 -15.36 -5.3 9.89
Accumulated Precipitation Percent of Average 156 112 121 143 110 154 123 123 112 105 102 98 105 103 91 93 91 87 96 106
Accumulated Precipitation Percentile (non-exceedance) 84.1 66 75.2 89.1 65.7 94.3 79.6 82.2 71.3 61.4 56.1 47.8 62.7 58.8 25.4 29.9 21.5 7.9 34.5 76.8
Standardized Precipitation Index 1 0.41 0.68 1.23 0.4 1.58 0.83 0.92 0.56 0.29 0.15 -0.06 0.32 0.22 -0.66 -0.53 -0.79 -1.41 -0.4 0.73