Standardized Precipitation Index Table

Big Horn Climate Division

Wyoming, Climate Division 04

Precipitation Data Table

Time Scale in Months (As of the end of Jul. 2020)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 0.7 2.72 3.89 5.18 5.86 7.34 8.04 8.53 9.57 10.98 14.2 15 22.98 26.27 31.14 41.61 49.29 70.13 82.62 100.23
Accumulated Precipitation Departure from Normal (in.) -0.37 -0.19 -1.29 -1.71 -2.18 -1.5 -1.71 -2.07 -2 -1.78 0.15 0.05 2.84 2.47 1.24 2.88 4.45 10.37 8.02 10.73
Accumulated Precipitation Percent of Average 65 94 75 75 73 83 82 80 83 86 101 100 114 110 104 107 110 117 111 112
Accumulated Precipitation Percentile (non-exceedance) 30 49.9 23.6 17.3 12 23 21.2 16.6 18.2 22.6 54.7 53 81.8 77.5 63.9 75.2 81.9 95.8 88.7 92.3
Standardized Precipitation Index -0.52 0 -0.72 -0.94 -1.18 -0.74 -0.8 -0.97 -0.91 -0.75 0.12 0.07 0.91 0.76 0.36 0.68 0.91 1.72 1.21 1.43