Standardized Precipitation Index Table

Southwest Climate Division

South Dakota, Climate Division 05

Precipitation Data Table

Time Scale in Months (As of the end of Apr. 2026)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 1.33 1.8 1.87 2.11 2.44 2.95 3.94 6.13 8.22 11.25 14.13 17.63 20.7 22.1 30.13 35.84 54.36 69.27 83.98 97.92
Accumulated Precipitation Departure from Normal (in.) -0.56 -1.08 -1.49 -1.67 -1.77 -1.76 -1.95 -1.02 -0.6 0.2 0.05 0.54 0.23 0.26 -4.07 -3.11 3.01 0.78 -1.69 -4.97
Accumulated Precipitation Percent of Average 70 62 56 56 58 63 67 86 93 102 100 103 101 101 88 92 106 101 98 95
Accumulated Precipitation Percentile (non-exceedance) 35.1 17.4 9.7 7.3 5.8 7.3 11.2 31.8 41.7 56.2 53.4 58.7 54.9 55 23 29.6 68.3 55.4 44.2 32.8
Standardized Precipitation Index -0.38 -0.94 -1.3 -1.46 -1.57 -1.45 -1.22 -0.47 -0.21 0.16 0.09 0.22 0.12 0.13 -0.74 -0.54 0.48 0.13 -0.15 -0.45