Standardized Precipitation Index Table

Cumberland Plateau Climate Division

Tennessee, Climate Division 02

Precipitation Data Table

Time Scale in Months (As of the end of Aug. 2022)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 4.24 11.67 15.43 19.74 24.14 28.71 37.77 43.91 49.31 50.98 57.82 64.03 81.87 99.13 123.75 160.97 200.03 279.34 344.13 404.6
Accumulated Precipitation Departure from Normal (in.) 0.02 2.37 1.58 1.44 1.18 0.02 4.19 5.19 5.18 2.65 6.21 8.67 12.67 15.09 13.06 21.64 34.1 58.28 68.17 73.78
Accumulated Precipitation Percent of Average 100 125 111 108 105 100 112 113 112 105 112 116 118 118 112 116 121 126 125 122
Accumulated Precipitation Percentile (non-exceedance) 55.8 83.1 70.9 67.4 63 52.5 77.4 80.4 77.5 65.7 79.1 85.5 91.3 92.8 84.8 93.6 97.7 99.8 99.9 99.9
Standardized Precipitation Index 0.15 0.96 0.55 0.45 0.33 0.06 0.75 0.86 0.76 0.4 0.81 1.06 1.36 1.46 1.03 1.52 1.99 2.87 3.04 3.03