Standardized Precipitation Index Table

East Central Climate Division

Oklahoma, Climate Division 06

Precipitation Data Table

Time Scale in Months (As of the end of Apr. 2026)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 6.6 9.47 10.69 11.85 11.98 14.31 18.4 21.03 26.44 30.35 37.81 46.84 61.41 76.37 98.25 117.74 143.26 188.64 234.91 282.78
Accumulated Precipitation Departure from Normal (in.) 1.99 1.35 0.28 -0.84 -3.37 -4.22 -4.02 -5.39 -3.29 -2.82 0.07 3.28 7.45 14.25 11.16 12.12 12.65 14.47 17.21 21.53
Accumulated Precipitation Percent of Average 143 117 103 93 78 77 82 80 89 91 100 108 114 123 113 111 110 108 108 108
Accumulated Precipitation Percentile (non-exceedance) 83.2 70.9 57.6 45.2 21.8 19.5 24.6 19.9 32.7 36.3 53 67.9 79.3 91.2 81.8 80.9 79.1 77.8 78.4 81
Standardized Precipitation Index 0.96 0.55 0.19 -0.12 -0.78 -0.86 -0.69 -0.85 -0.45 -0.35 0.07 0.47 0.82 1.35 0.91 0.88 0.81 0.76 0.78 0.88