Standardized Precipitation Index Table

Green and Bear Drainage Climate Division

Wyoming, Climate Division 03

Precipitation Data Table

Time Scale in Months (As of the end of Jan. 2026)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 0.67 2.19 2.92 4.61 5.53 6.3 6.84 7.04 7.89 8.98 10.52 12.03 14.4 17.49 24.37 31.08 39.15 53.06 66.29 75.85
Accumulated Precipitation Departure from Normal (in.) -0.43 0.05 -0.24 0.29 0.1 -0.11 -0.47 -1.36 -2.07 -2.31 -1.95 -1.5 -2.32 -2.48 -2.73 -2.46 -1.53 -1.18 -1.52 -5.52
Accumulated Precipitation Percent of Average 61 102 92 107 102 98 94 84 79 80 84 89 86 88 90 93 96 98 98 93
Accumulated Precipitation Percentile (non-exceedance) 22.5 57.3 44 63 56.2 50.2 41.2 23.7 15.3 14.1 19.9 26.5 18.4 19.7 21.8 27.7 37.9 42.3 40.8 19.5
Standardized Precipitation Index -0.76 0.18 -0.15 0.33 0.16 0 -0.22 -0.72 -1.02 -1.08 -0.84 -0.63 -0.9 -0.85 -0.78 -0.59 -0.31 -0.19 -0.23 -0.86