Standardized Precipitation Index Table

Southwest Valleys Climate Division

Idaho, Climate Division 05

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.) 1.92 3.9 6.17 7.66 8.83 9.78 10.27 11.61 11.63 12.92 14.08 14.98 19.52 24.59 29.95 36.96 40.61 53.89 67.39 81.03
Accumulated Precipitation Departure from Normal (in.) 0.49 1.01 1.49 1.18 0.76 0.74 0.65 1.67 1.39 1.69 1.56 1.27 1.14 1.85 2.54 0.57 -0.43 -0.83 -1.01 -1.05
Accumulated Precipitation Percent of Average 134 135 132 118 109 108 107 117 114 115 112 109 106 108 109 102 99 98 99 99
Accumulated Precipitation Percentile (non-exceedance) 76.3 80.7 83.8 75.4 66.2 65.6 64 78.3 74.5 78.1 74.3 70.5 66.8 71.7 75.7 56.7 47.9 45.4 44.7 44.9
Standardized Precipitation Index 0.72 0.87 0.99 0.69 0.42 0.4 0.36 0.78 0.66 0.77 0.65 0.54 0.43 0.57 0.7 0.17 -0.05 -0.12 -0.13 -0.13