Standardized Precipitation Index Table

Western Climate Division

Tennessee, Climate Division 04

Precipitation Data Table

Time Scale in Months (As of the end of Feb. 2024)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 4.12 10.72 12.87 14.83 16.79 18.01 25.5 31.85 34.62 38.98 43.79 51.04 67.32 74.03 100.84 127.76 160.56 215.9 279.41 347.89
Accumulated Precipitation Departure from Normal (in.) -0.23 1.57 -1.21 -3.54 -4.76 -6.91 -2.93 -0.58 -1.77 -2.14 -2.25 -0.37 1.72 -2.45 -2.08 -0.28 6.08 9.91 21.95 38.94
Accumulated Precipitation Percent of Average 95 117 91 81 78 72 90 98 95 95 95 99 103 97 98 100 104 105 109 113
Accumulated Precipitation Percentile (non-exceedance) 52.5 71 42.8 26.5 20.1 11.8 34.4 49.3 42.4 40.6 40.7 50.3 58.8 43.2 44.9 50.8 66.1 71.4 85.4 95.1
Standardized Precipitation Index 0.06 0.55 -0.18 -0.63 -0.84 -1.18 -0.4 -0.02 -0.19 -0.24 -0.24 0.01 0.22 -0.17 -0.13 0.02 0.41 0.56 1.05 1.66