Standardized Precipitation Index Table

Piedmont Plateau Climate Division

Alabama, Climate Division 05

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.) 4.48 8.5 12.05 21.09 28.27 39.56 48.04 54.69 58.64 63.83 64.43 68.31 80.4 94.09 132.16 161.33 185.12 240.79 301.61 351.56
Accumulated Precipitation Departure from Normal (in.) -0.76 -0.95 -1.31 2.92 3.93 9.91 13.33 14.83 15.07 17.46 14.63 14.34 13.06 10.55 24.28 23.85 23.34 24.96 31.75 27.74
Accumulated Precipitation Percent of Average 86 90 90 116 116 133 138 137 135 138 129 127 119 113 123 117 114 112 112 109
Accumulated Precipitation Percentile (non-exceedance) 38.4 41.1 39.2 75.3 77.4 93.1 96.6 96.7 96.3 97.6 95.1 94.4 92.3 84.9 97.3 96.1 94.9 94.7 96.6 93.2
Standardized Precipitation Index -0.29 -0.22 -0.27 0.68 0.75 1.48 1.83 1.84 1.79 1.98 1.66 1.59 1.43 1.03 1.93 1.77 1.63 1.61 1.82 1.49