Standardized Precipitation Index Table

Eastern Climate Division

Tennessee, Climate Division 01

Precipitation Data Table

Time Scale in Months (As of the end of Jul. 2020)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 3.31 7.2 11.82 19.4 26.77 37.69 44.21 50.24 55.09 61.47 61.88 65.37 82.19 103.29 138.74 171.96 192.88 243.74 296.44 349.95
Accumulated Precipitation Departure from Normal (in.) -1.61 -2.2 -1.69 1.66 3.81 10.2 12.17 13.5 14.66 17.97 15.03 14.49 17.78 25 37.06 42.96 40.62 40.84 42.99 45.91
Accumulated Precipitation Percent of Average 67 77 87 109 117 137 138 137 136 141 132 128 128 132 136 133 127 120 117 115
Accumulated Precipitation Percentile (non-exceedance) 14.1 17.3 29.7 70.4 82.1 97.2 98.2 98.1 98.6 99.4 97.8 97 98.2 99.5 99.9 100 99.8 99.5 99.5 99.5
Standardized Precipitation Index -1.08 -0.94 -0.53 0.54 0.92 1.91 2.1 2.08 2.19 2.49 2.01 1.88 2.1 2.6 3.06 3.33 2.83 2.6 2.56 2.59