Standardized Precipitation Index Table

Central Plains Climate Division

Idaho, Climate Division 07

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.) 0.22 1.07 1.89 2.35 3.42 3.65 4.91 5.99 6.25 6.58 7.38 7.63 10.43 14.65 18.92 23.72 28.56 44.28 56.2 67.48
Accumulated Precipitation Departure from Normal (in.) -0.09 -0.03 -0.31 -0.72 -0.63 -1.39 -1.42 -1.6 -2.46 -2.93 -2.63 -2.71 -2.11 -0.74 -1.75 -1.99 -2.45 2.94 4.55 5.52
Accumulated Precipitation Percent of Average 70 97 86 77 84 72 78 79 72 69 74 74 83 95 92 92 92 107 109 109
Accumulated Precipitation Percentile (non-exceedance) 45.9 58.2 45.5 32.8 37.4 19.1 24.3 24.7 14.5 9.7 12.6 11.1 21.6 41.8 32.2 31.9 30.7 72 78.3 80.9
Standardized Precipitation Index -0.1 0.21 -0.11 -0.44 -0.32 -0.87 -0.7 -0.68 -1.06 -1.3 -1.15 -1.22 -0.78 -0.21 -0.46 -0.47 -0.5 0.58 0.78 0.87