Standardized Precipitation Index Table

Snake Drainage Climate Division

Wyoming, Climate Division 02

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.) 5.34 10.54 14 16.5 18.49 21.77 24.38 27.31 28.16 31.96 33.86 36.54 47.58 57.8 72.53 88.68 99.36 128.49 163.34 198.78
Accumulated Precipitation Departure from Normal (in.) 1.86 3.49 2.71 1.52 0.12 1.17 2 3.48 3.05 4.62 3.62 3.45 3.22 4.12 6.37 2.03 0.25 -3.59 -1.78 0.52
Accumulated Precipitation Percent of Average 153 150 124 110 101 106 109 115 112 117 112 110 107 108 110 102 100 97 99 100
Accumulated Precipitation Percentile (non-exceedance) 87.9 91.9 80.1 67.6 54.4 62.4 67.8 76.9 74.1 81.8 75.4 74 71.1 72.4 78.4 59.8 52.4 39.7 46 52.4
Standardized Precipitation Index 1.17 1.4 0.85 0.46 0.11 0.32 0.46 0.73 0.65 0.91 0.69 0.64 0.56 0.6 0.79 0.25 0.06 -0.26 -0.1 0.06