Standardized Precipitation Index Table

Upper Plains Climate Division

Alabama, Climate Division 03

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.) 11.41 17.59 22.88 27.41 30.89 35.4 39.8 39.88 46.5 47.57 54.21 57.52 71.96 89.41 108.43 141.87 165.34 236.04 293.86 370.67
Accumulated Precipitation Departure from Normal (in.) 7.03 8.12 7.32 6.52 4.61 3.75 4.12 1.18 4.37 1.41 2.93 2.04 0.98 2.25 -2.58 -0.9 -1.31 13.61 15.76 36.89
Accumulated Precipitation Percent of Average 261 186 147 131 118 112 112 103 110 103 106 104 101 103 98 99 99 106 106 111
Accumulated Precipitation Percentile (non-exceedance) 99.3 98.2 93.7 88.3 79.4 73.1 73.4 58.8 73 59.3 65.7 61.4 55.7 59.4 43.4 48.8 47.8 78.8 79.6 96
Standardized Precipitation Index 2.47 2.1 1.53 1.19 0.82 0.62 0.63 0.22 0.61 0.23 0.4 0.29 0.14 0.24 -0.17 -0.03 -0.05 0.8 0.83 1.75