Standardized Precipitation Index Table

West Central Lower Climate Division

Michigan, Climate Division 05

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.) 2.89 7.35 10.71 13.86 14.79 17.4 20.86 24.31 32.18 37.93 41.07 44.18 56.73 64.75 86.35 103.32 122.72 165.64 201.1 236.49
Accumulated Precipitation Departure from Normal (in.) -0.24 1.08 1.54 2.53 1.8 2.26 3.41 3.98 8.67 11.01 11.05 11.4 14.79 16.85 20.83 22.72 24.56 34.82 37.67 40.43
Accumulated Precipitation Percent of Average 92 117 117 122 114 115 120 120 137 141 137 135 135 135 132 128 125 127 123 121
Accumulated Precipitation Percentile (non-exceedance) 48 72 74.3 82.3 74.6 77.4 84.8 85.6 97.2 98.5 98 98.1 99.2 99.5 99.4 99.4 99 99.7 99.5 99.2
Standardized Precipitation Index -0.05 0.58 0.65 0.93 0.66 0.75 1.03 1.06 1.91 2.17 2.06 2.08 2.4 2.6 2.53 2.54 2.35 2.71 2.57 2.41