Standardized Precipitation Index Table

Northwest Lower Climate Division

Michigan, Climate Division 03

Precipitation Data Table

Time Scale in Months (As of the end of Nov. 2019)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 3 8.35 13.93 15.5 18.84 23.46 27.75 30.88 32.5 35.26 37.91 39.76 50.3 58.66 73.96 97.23 114.22 148.9 178.27 218.21
Accumulated Precipitation Departure from Normal (in.) 0.21 2.39 4.36 2.89 3.38 4.95 6.32 6.91 6.66 7.9 8.54 8.17 9.18 8.6 10.85 15.65 19.59 22.88 20.85 29.41
Accumulated Precipitation Percent of Average 107 140 146 123 122 127 129 129 126 129 129 126 122 117 117 119 121 118 113 116
Accumulated Precipitation Percentile (non-exceedance) 62.2 89.3 94.7 84.9 87.6 94 97 96.8 96.3 98.1 98.5 97.8 96.5 94.6 96.2 98.1 99 98.8 96.3 98.4
Standardized Precipitation Index 0.31 1.24 1.62 1.03 1.16 1.56 1.89 1.85 1.79 2.08 2.16 2.01 1.81 1.61 1.78 2.07 2.35 2.25 1.78 2.15