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 Mar. 2024)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 2.81 3.36 7.4 9.48 11.16 15.76 17.63 21.47 28.06 29.31 30.62 34.43 44.35 49.36 70.19 87.69 111.34 143.32 188.36 227.32
Accumulated Precipitation Departure from Normal (in.) 0.47 -0.68 1.44 1.36 0.46 2.24 0.93 1.57 4.97 2.67 0.45 1.22 5.2 2.6 3.74 7.76 11.72 10.59 22.5 28.39
Accumulated Precipitation Percent of Average 120 83 124 117 104 117 106 108 122 110 101 104 113 106 106 110 112 108 114 114
Accumulated Precipitation Percentile (non-exceedance) 71.4 34.8 80.4 75.8 60.2 79.1 63.3 68.2 88.4 74.3 55.9 61.9 84.7 68.6 71.5 83.5 89.7 82.5 94.7 96
Standardized Precipitation Index 0.56 -0.39 0.85 0.7 0.26 0.81 0.34 0.47 1.2 0.65 0.15 0.3 1.02 0.48 0.57 0.97 1.27 0.94 1.61 1.76