Standardized Precipitation Index Table

South Central Lower Climate Division

Michigan, Climate Division 09

Precipitation Data Table

Time Scale in Months (As of the end of Jul. 2026)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 2.33 6.58 8.39 15.78 20.16 21.09 22.5 25.31 27.02 30.37 32.11 33.94 46.51 54.06 66.37 88.93 107.05 141.71 181.94 214.62
Accumulated Precipitation Departure from Normal (in.) -0.88 -0.21 -1.92 2.4 4.41 3.65 3.15 3.74 2.88 3.42 2 0.64 2.88 3.35 -0.2 4.96 7.22 8.65 15.68 15.2
Accumulated Precipitation Percent of Average 73 97 81 118 128 121 116 117 112 113 107 102 107 107 100 106 107 107 109 108
Accumulated Precipitation Percentile (non-exceedance) 28.2 49.6 23.1 80.4 92.3 87.1 82.8 85 78.2 80.1 69.2 57.2 71.7 72.7 50.3 73.6 77.9 77.5 87.1 83
Standardized Precipitation Index -0.58 -0.01 -0.73 0.86 1.42 1.13 0.95 1.04 0.78 0.85 0.5 0.18 0.57 0.6 0.01 0.63 0.77 0.76 1.13 0.95