Standardized Precipitation Index Table

Northwest Lower Climate Division

Michigan, Climate Division 03

Precipitation Data Table

Time Scale in Months (As of the end of May 2025)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 3 5.04 10.48 12.08 13.61 16.48 19.8 21.55 22.36 25.1 28.12 33.15 43.23 47.92 64.75 78.09 98.16 135.37 166.46 207.91
Accumulated Precipitation Departure from Normal (in.) 0.07 -0.44 3.08 3.16 2.7 3.38 3.91 2.46 -0.29 -0.62 -0.49 1.49 4.19 3.14 1.4 1.67 3.16 8.72 8.2 18.01
Accumulated Precipitation Percent of Average 102 92 142 135 125 126 125 113 99 98 98 105 111 107 102 102 103 107 105 109
Accumulated Precipitation Percentile (non-exceedance) 57.8 42.7 93.7 93 87.9 90.7 91 78.7 49 45.5 46.9 66 83 75.3 60.3 60.8 66 81 75.8 89.8
Standardized Precipitation Index 0.2 -0.18 1.53 1.47 1.17 1.32 1.34 0.8 -0.03 -0.11 -0.08 0.41 0.95 0.68 0.26 0.27 0.41 0.88 0.7 1.27