Standardized Precipitation Index Table

Big Horn Climate Division

Wyoming, Climate Division 04

Precipitation Data Table

Time Scale in Months (As of the end of Apr. 2026)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 1.34 2.11 2.7 3.07 4.64 5.06 7.52 8.61 9.08 10.17 11.46 13.7 18.79 20.82 27.96 33.83 48.63 63.52 76.47 88.13
Accumulated Precipitation Departure from Normal (in.) -0.37 -0.75 -0.97 -1.5 -0.78 -1.31 -0.06 -0.26 -0.7 -0.67 -1.21 -1.25 0.17 -0.51 -1.94 -2.44 3.77 3.72 1.78 -1.48
Accumulated Precipitation Percent of Average 78 74 74 67 86 79 99 97 93 94 90 92 101 98 94 93 108 106 102 98
Accumulated Precipitation Percentile (non-exceedance) 36 19.7 16.3 8.5 27.8 16.6 51.1 47 37.7 39.6 32.5 34.2 54.3 45.4 32.2 29.3 78.2 74.6 61.7 43.2
Standardized Precipitation Index -0.36 -0.85 -0.98 -1.37 -0.59 -0.97 0.03 -0.08 -0.31 -0.26 -0.45 -0.41 0.11 -0.12 -0.46 -0.54 0.78 0.66 0.3 -0.17