Standardized Precipitation Index Table

East Central Climate Division

Oklahoma, Climate Division 06

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.) 8.73 19.35 21.88 23.29 25.12 28.3 38.25 39.54 41.03 46.33 49.79 54.1 69.6 77.89 100.99 124.09 142.1 189.43 236.31 299.47
Accumulated Precipitation Departure from Normal (in.) 2.91 8.94 7.95 7.07 6.61 7.09 13.86 11.26 8.74 10.75 10.77 10.54 12.17 13.18 13.95 15.85 11.53 15.33 18.7 38.32
Accumulated Precipitation Percent of Average 150 186 157 144 136 133 157 140 127 130 128 124 121 120 116 115 109 109 109 115
Accumulated Precipitation Percentile (non-exceedance) 86.3 98.7 96.1 93 90.2 90.4 98.3 95 88.9 92.5 91.7 90 89 88.8 86.4 86 77 79 80.2 93.4
Standardized Precipitation Index 1.09 2.23 1.77 1.48 1.29 1.31 2.11 1.64 1.22 1.44 1.38 1.28 1.23 1.22 1.1 1.08 0.74 0.81 0.85 1.51