Standardized Precipitation Index Table

Southwest Lower Climate Division

Michigan, Climate Division 08

Precipitation Data Table

Time Scale in Months (As of the end of Feb. 2024)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 0.73 4.79 7.28 8.7 14.44 16.46 19.68 25.74 27.13 28.54 31.96 36.81 45.32 53.35 74.79 92.25 112.4 146.09 191.97 233.8
Accumulated Precipitation Departure from Normal (in.) -1.06 0.83 0.86 -0.58 1.96 0.53 0.46 3.38 1.28 -0.88 -0.68 1.7 3.75 2.26 4.53 6.04 7.04 5.6 16.3 23.02
Accumulated Precipitation Percent of Average 41 121 113 94 116 103 102 115 105 97 98 105 109 104 106 107 107 104 109 111
Accumulated Precipitation Percentile (non-exceedance) 7.8 74.7 70.6 42.4 77.4 58.9 57.4 80.2 63.4 44.2 46.3 65.4 76.7 65.9 75.4 78.1 78.6 69.9 88.8 93.1
Standardized Precipitation Index -1.42 0.66 0.54 -0.19 0.75 0.23 0.19 0.85 0.34 -0.15 -0.09 0.4 0.73 0.41 0.69 0.78 0.79 0.52 1.22 1.48