Standardized Precipitation Index Table

Northwest Lower Climate Division

Michigan, Climate Division 03

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.) 2.63 5.3 7.39 10.36 12.17 15.17 18.84 22.79 25.85 27.89 33.33 34.93 42.65 47.95 67.15 82.63 96.99 131.71 165.25 201.34
Accumulated Precipitation Departure from Normal (in.) 0.63 1.14 0.46 0.23 -1.51 -1.58 -0.8 0.09 0.22 -0.29 3.22 3.3 4.02 -0.51 3.85 2.48 2.04 5.09 7 11.45
Accumulated Precipitation Percent of Average 132 128 107 102 89 91 96 100 101 99 111 110 110 99 106 103 102 104 104 106
Accumulated Precipitation Percentile (non-exceedance) 81.4 85.3 63.6 56.9 31.6 32 42 53 54.3 48.6 80.8 81.2 82.5 47.6 74.9 64.2 61.1 70.2 72.8 79.8
Standardized Precipitation Index 0.89 1.05 0.35 0.17 -0.48 -0.47 -0.2 0.07 0.11 -0.04 0.87 0.89 0.93 -0.06 0.67 0.36 0.28 0.53 0.61 0.84