Standardized Precipitation Index Table

Southwest Valleys Climate Division

Idaho, Climate Division 05

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.) 0.15 2.72 4.65 5.37 6.54 7.39 9.97 11.44 11.71 12.38 13.43 13.58 16.7 24.32 29.3 35.15 41.33 58.6 72.13 85.81
Accumulated Precipitation Departure from Normal (in.) -0.16 1.43 2.07 1.6 1.33 0.72 1.5 1.17 -0.16 -0.46 0.01 -0.15 0.4 3.92 1.87 1.08 0.23 3.81 3.67 3.69
Accumulated Precipitation Percent of Average 48 210 180 142 126 111 118 111 99 96 100 99 102 119 107 103 101 107 105 104
Accumulated Precipitation Percentile (non-exceedance) 37.8 94 93.5 86.2 79.9 68.1 76.7 70 50.7 46.3 52.9 50.5 57.7 88.7 69.8 61.6 53.5 75.7 73.1 71.6
Standardized Precipitation Index -0.31 1.55 1.52 1.09 0.84 0.47 0.73 0.52 0.02 -0.09 0.07 0.01 0.19 1.21 0.52 0.29 0.09 0.7 0.62 0.57