Standardized Precipitation Index Table

West Upper Climate Division

Michigan, Climate Division 01

Precipitation Data Table

Time Scale in Months (As of the end of Jan. 2026)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 3 5.44 8.18 10.19 14.07 17.15 20.96 25.87 27.23 30.66 34.76 36.17 43.73 50.25 67.93 80.16 97.88 134.34 162 196.95
Accumulated Precipitation Departure from Normal (in.) 1.36 2.01 2.32 1.51 1.84 1.62 1.9 3.18 1.4 2.44 4.75 4.8 6.46 3.3 5.17 1.83 3.76 8.81 5.07 8.62
Accumulated Precipitation Percent of Average 183 158 140 117 115 110 110 114 105 109 116 115 117 107 108 102 104 107 103 105
Accumulated Precipitation Percentile (non-exceedance) 96.3 96.1 91.8 77.9 76.5 71.4 72 81.4 65.7 73.6 87 86.7 92.4 74.5 80.9 61.8 70.2 84.3 70.1 78.5
Standardized Precipitation Index 1.79 1.76 1.39 0.77 0.72 0.56 0.58 0.89 0.4 0.63 1.12 1.11 1.43 0.66 0.87 0.3 0.53 1.01 0.53 0.79