Standardized Precipitation Index Table

South Central Climate Division

South Dakota, Climate Division 08

Precipitation Data Table

Time Scale in Months (As of the end of May 2025)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 4.27 6.84 8.3 8.51 8.86 9.3 10.22 10.29 10.52 12.47 14.09 18.93 26.16 28.23 46.57 56.47 65.11 83.71 102.62 129.13
Accumulated Precipitation Departure from Normal (in.) 1.15 1.47 1.79 1.45 1.36 1.3 1.61 0.35 -1 -1.27 -2.26 -0.79 -0.06 0.48 7.08 8.95 5.9 4.76 3.89 10.55
Accumulated Precipitation Percent of Average 137 127 128 121 118 116 119 103 91 91 86 96 100 102 118 119 110 106 104 109
Accumulated Precipitation Percentile (non-exceedance) 78.7 77.5 79.8 75.1 73.9 72.8 75.9 58.5 40.8 38 28.6 44.6 51.9 56.2 88 91.2 79.1 71.2 65.5 81.1
Standardized Precipitation Index 0.8 0.75 0.83 0.68 0.64 0.61 0.7 0.22 -0.23 -0.3 -0.56 -0.14 0.05 0.16 1.18 1.35 0.81 0.56 0.4 0.88