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 Sep. 2020)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 0.5 0.7 1.09 2.95 3.7 4.63 5.76 6.7 7.84 8.86 9.96 10.63 13.35 18.58 26.15 31.3 36.83 55.7 70.85 85
Accumulated Precipitation Departure from Normal (in.) -0.61 -1.37 -1.89 -1.13 -1.95 -2.37 -2.41 -2.53 -2.5 -2.52 -2.45 -2.94 -3.22 -2.01 -1.01 -2.87 -3.92 1.33 2.92 3.51
Accumulated Precipitation Percent of Average 45 34 37 72 65 66 71 73 76 78 80 78 81 90 96 92 90 102 104 104
Accumulated Precipitation Percentile (non-exceedance) 20.9 3.4 1.7 22.2 11.2 9.2 10.7 10.3 12.4 13.5 14.8 12 10.5 26.2 40.1 24.7 19.6 61 69.6 71.4
Standardized Precipitation Index -0.81 -1.82 -2.12 -0.76 -1.22 -1.33 -1.25 -1.27 -1.15 -1.1 -1.04 -1.18 -1.26 -0.64 -0.25 -0.68 -0.86 0.28 0.51 0.56