Standardized Precipitation Index Table

Southeast Lower Climate Division

Michigan, Climate Division 10

Precipitation Data Table

Time Scale in Months (As of the end of Apr. 2026)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 5.36 9.26 10.09 11.57 14.43 15.85 18.01 19.34 21.33 25.22 29.43 33.4 40.82 47.03 67.23 82.45 102.99 134.41 175.16 205.28
Accumulated Precipitation Departure from Normal (in.) 2.45 4.1 3.27 2.93 3.69 2.74 2.4 0.8 -0.26 0.53 1.41 2.09 2.71 2.6 4.59 6.73 9.07 9.25 18.74 17.66
Accumulated Precipitation Percent of Average 184 179 148 134 134 121 115 104 99 102 105 107 107 106 107 109 110 107 112 109
Accumulated Precipitation Percentile (non-exceedance) 96.3 98.9 95 90.7 93.2 84.6 80 62 49.3 57.4 64.9 69.5 71.9 69.2 75.9 81.4 85.5 81.4 93.1 88.9
Standardized Precipitation Index 1.79 2.28 1.65 1.32 1.49 1.02 0.84 0.3 -0.02 0.19 0.38 0.51 0.58 0.5 0.7 0.89 1.06 0.89 1.48 1.22