Standardized Precipitation Index Table

Belle Fourche Drainage Climate Division

Wyoming, Climate Division 06

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.) 0.42 0.85 1.13 1.48 1.67 2.98 5.08 7.3 8.94 13.68 17.56 18.3 20.96 22.96 35.06 39.46 46.88 58.39 81.03 100.81
Accumulated Precipitation Departure from Normal (in.) -0.58 -0.77 -1.08 -1.34 -1.82 -1.67 -0.87 0 -0.19 1.8 2.92 1.91 2.35 1.93 2.32 2.1 -2.2 -7.08 -0.89 2.48
Accumulated Precipitation Percent of Average 42 52 51 53 48 64 85 100 98 115 120 112 113 109 107 106 96 89 99 103
Accumulated Precipitation Percentile (non-exceedance) 9.1 7.5 4.8 2.6 1 7 29.9 53.2 49.4 77.4 83.1 73.4 76.1 71.2 69.9 67.2 37.3 16.2 47 61.6
Standardized Precipitation Index -1.34 -1.44 -1.66 -1.95 -2.33 -1.48 -0.53 0.08 -0.02 0.75 0.96 0.62 0.71 0.56 0.52 0.45 -0.32 -0.99 -0.07 0.29