Standardized Precipitation Index Table

South Central Climate Division

Oklahoma, Climate Division 08

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.) 7.71 17.89 21.46 22.16 23.71 26.2 34.52 35.23 36.76 38.27 41.09 45.22 62.83 69.97 90.25 108.13 123.71 156.96 195.86 244.07
Accumulated Precipitation Departure from Normal (in.) 2.2 8.44 9.06 7.69 7.39 7.57 13.32 10.35 8.34 7.13 7.08 7.08 12.37 13.24 14.01 13.3 9.38 4.47 5.15 15.12
Accumulated Precipitation Percent of Average 140 189 173 153 145 141 163 142 129 123 121 119 125 123 118 114 108 103 103 107
Accumulated Precipitation Percentile (non-exceedance) 80.6 97.9 97.9 95.4 93.4 93.1 98.5 93.8 89.2 85.8 84.9 83 90.9 90.7 88.9 84.9 75.8 62.2 62.4 78
Standardized Precipitation Index 0.86 2.04 2.03 1.69 1.51 1.48 2.18 1.54 1.23 1.07 1.03 0.95 1.33 1.32 1.22 1.03 0.7 0.31 0.31 0.77