Standardized Precipitation Index Table

Cheyenne & Niobrara Climate Division

Wyoming, Climate Division 07

Precipitation Data Table

Time Scale in Months (As of the end of Feb. 2024)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 0.68 0.92 1.05 1.34 3.19 4.56 6.4 8.31 11.94 14.92 15.97 16.6 18.58 19.91 28.52 33.25 42.6 51.46 69.55 90.03
Accumulated Precipitation Departure from Normal (in.) 0.19 0.01 -0.32 -0.57 0.33 0.58 1.21 1.33 2.7 3.12 2.5 2.33 2.95 1.68 0.02 0.78 -0.15 -5.57 -1.81 4.37
Accumulated Precipitation Percent of Average 139 101 76 70 111 115 123 119 129 126 119 116 119 109 100 102 100 90 97 105
Accumulated Precipitation Percentile (non-exceedance) 79.3 55.9 24.3 14.4 68.7 73.3 84 80.1 90.6 88.9 82.8 80.8 85.1 72.7 52 59.2 50.2 15.5 39.6 74.2
Standardized Precipitation Index 0.82 0.15 -0.7 -1.06 0.49 0.62 0.99 0.85 1.32 1.22 0.94 0.87 1.04 0.6 0.05 0.23 0.01 -1.01 -0.26 0.65