Standardized Precipitation Index Table

Middle Climate Division

Tennessee, Climate Division 03

Precipitation Data Table

Time Scale in Months (As of the end of Mar. 2024)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 4.34 8.91 15.43 18.02 20.12 21.1 22.8 28.46 34.19 37.18 41.76 45.89 61.85 73.02 95.94 128.99 160.05 220.56 288.4 354.65
Accumulated Precipitation Departure from Normal (in.) -1.22 -1.24 0.35 -2.12 -4.13 -6.33 -8.08 -6.24 -4.84 -6.01 -5.96 -6.48 -5.6 -6.87 -8.89 -3.35 2.75 10.83 26.34 40.27
Accumulated Precipitation Percent of Average 78 88 102 89 83 77 74 82 88 86 88 88 92 91 92 97 102 105 110 113
Accumulated Precipitation Percentile (non-exceedance) 33.7 39.4 56.9 36.3 23.2 13.2 9 17.6 25.3 20.7 21.8 20.7 28 26.6 23.1 41.8 58.6 74.3 91.4 96.8
Standardized Precipitation Index -0.42 -0.27 0.17 -0.35 -0.73 -1.12 -1.34 -0.93 -0.67 -0.82 -0.78 -0.82 -0.58 -0.62 -0.74 -0.21 0.22 0.65 1.37 1.86