Standardized Precipitation Index Table

Northwest Lower Climate Division

Michigan, Climate Division 03

Precipitation Data Table

Time Scale in Months (As of the end of Jun. 2020)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 3.36 7.62 11.12 14.1 15.15 17.23 21.09 24.25 29.53 35.12 36.69 40.03 52.07 59.1 78.06 92.76 113.51 150.63 186.27 220.59
Accumulated Precipitation Departure from Normal (in.) 0.31 1.64 2.59 3.7 3.22 3.29 4.95 5.31 7.42 9.41 7.93 8.42 11.95 13.58 14.88 15.71 18.84 24.52 28.76 31.68
Accumulated Precipitation Percent of Average 110 127 130 136 127 124 131 128 134 137 128 127 130 130 124 120 120 119 118 117
Accumulated Precipitation Percentile (non-exceedance) 64.5 82.2 87.7 93.3 90 88.9 95.1 94.6 97.4 98.6 96.5 97.1 99.1 99.5 98.6 98.5 98.6 99 99.1 98.8
Standardized Precipitation Index 0.37 0.92 1.16 1.5 1.28 1.22 1.66 1.6 1.95 2.19 1.82 1.9 2.38 2.55 2.2 2.18 2.19 2.34 2.35 2.26