Standardized Precipitation Index Table

Eastern Climate Division

Tennessee, Climate Division 01

Precipitation Data Table

Time Scale in Months (As of the end of May 2025)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 6.93 11.38 15.5 21.35 23.84 28.13 30.67 31.15 38.55 40.94 46.38 48.68 64.1 79.66 100.99 128.27 150.15 206.83 260.65 331.29
Accumulated Precipitation Departure from Normal (in.) 2.78 3.03 1.93 3.21 1.15 0.75 -0.35 -2.93 1.09 -0.61 -0.11 -2.26 -0.4 1.27 -0.99 -1.07 -2.8 2.83 5.72 25.37
Accumulated Precipitation Percent of Average 167 136 114 118 105 103 99 91 103 99 100 96 99 102 99 99 98 101 102 108
Accumulated Precipitation Percentile (non-exceedance) 94.2 91.2 74.6 79.8 62.5 58.2 49.8 32.2 58.9 48.3 51.2 38.8 49.6 56.9 47.8 47.9 43 58.1 63.6 90.8
Standardized Precipitation Index 1.57 1.35 0.66 0.83 0.32 0.21 0 -0.46 0.23 -0.04 0.03 -0.28 -0.01 0.17 -0.06 -0.05 -0.17 0.2 0.35 1.33