Standardized Precipitation Index Table

Southeast Climate Division

Iowa, Climate Division 09

Precipitation Data Table

Time Scale in Months (As of the end of Feb. 2024)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 0.16 3.44 6.14 6.67 9.27 10.93 14.27 17.64 19.95 22.04 23.62 26 32.08 40.5 56.58 67.24 92.37 127.54 169.81 211.78
Accumulated Precipitation Departure from Normal (in.) -1.14 0.8 1.93 0.41 0.33 -1.81 -2.24 -2.84 -5.16 -7.3 -9.09 -9.07 -7.23 -7.37 -13.68 -15.78 -13.09 -13.17 -6.15 0.58
Accumulated Precipitation Percent of Average 12 130 146 107 104 86 86 86 79 75 72 74 82 85 81 81 88 91 97 100
Accumulated Precipitation Percentile (non-exceedance) 1.1 78.5 89.8 61.8 58.8 34.2 32 30.7 18.5 11.1 6.8 7.6 14.5 17.4 7.1 5.9 13.2 17.5 35.9 52.4
Standardized Precipitation Index -2.28 0.79 1.27 0.3 0.22 -0.41 -0.47 -0.5 -0.89 -1.22 -1.49 -1.44 -1.06 -0.94 -1.47 -1.56 -1.12 -0.93 -0.36 0.06