Standardized Precipitation Index Table

Wind River Climate Division

Wyoming, Climate Division 09

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.) 1.48 3.02 5.3 6.6 7.47 8.08 8.69 9.67 10.07 10.86 11.51 11.91 16.83 19.59 32.53 40.95 47.35 62.95 75.02 87.78
Accumulated Precipitation Departure from Normal (in.) -0.81 -1.12 -0.13 0.3 0.26 0.01 -0.33 -0.58 -1.35 -1.43 -1.77 -2.96 -3.47 -3.34 2.78 3.13 2.75 3.51 0.75 -1.34
Accumulated Precipitation Percent of Average 64 73 98 105 104 100 96 94 88 88 87 80 83 85 109 108 106 106 101 98
Accumulated Precipitation Percentile (non-exceedance) 28 25.2 50.9 60.4 58.8 53.4 46.5 42 29 28.2 25 14.2 15.5 17.8 75.4 75.3 71.4 73.2 55.7 43.7
Standardized Precipitation Index -0.58 -0.67 0.02 0.26 0.22 0.09 -0.09 -0.2 -0.55 -0.58 -0.68 -1.07 -1.02 -0.92 0.69 0.68 0.56 0.62 0.14 -0.16