Standardized Precipitation Index Table

Central Plains Climate Division

Idaho, Climate Division 07

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.) 1.39 3.05 4.2 4.99 6 7.16 7.86 8.85 8.87 9.97 11.13 11.54 14.33 17.37 21 26.57 28.62 35.39 44.69 54.83
Accumulated Precipitation Departure from Normal (in.) 0.41 1.09 0.96 0.5 0.4 0.75 0.95 1.61 1.32 1.64 1.69 1.25 0.81 0.68 0.43 -0.39 -2.21 -5.73 -6.76 -6.97
Accumulated Precipitation Percent of Average 141 156 130 111 107 112 114 122 117 120 118 112 106 104 102 99 93 86 87 89
Accumulated Precipitation Percentile (non-exceedance) 78.2 88.6 79.6 66.4 62.4 68.6 71.8 81.9 77.6 80.6 79.1 72.6 64.2 60.9 57.1 48.4 32.9 14.3 12.7 13.9
Standardized Precipitation Index 0.78 1.2 0.83 0.42 0.32 0.48 0.58 0.91 0.76 0.86 0.81 0.6 0.36 0.28 0.18 -0.04 -0.44 -1.07 -1.14 -1.09