Standardized Precipitation Index Table

North Central Climate Division

Oklahoma, Climate Division 02

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.) 3.66 10.05 10.9 11.18 11.86 12.12 18.83 19.46 21.13 23.01 25.92 29.09 37.22 42.89 63.34 72.89 83.47 108.78 140.26 170.63
Accumulated Precipitation Departure from Normal (in.) -0.63 2.95 1.9 1.06 0.86 -0.03 5.07 3.25 2.08 0.97 0.99 0.22 -0.64 1.83 5.56 2.95 -3.16 -6.79 -4.28 -2.86
Accumulated Precipitation Percent of Average 85 142 121 110 108 100 137 120 111 104 104 101 98 104 110 104 96 94 97 98
Accumulated Precipitation Percentile (non-exceedance) 46.8 86.1 74.2 65.5 63.1 54 87.6 76.5 68.6 60.3 59.8 54.2 48.7 62.2 74.8 63.5 40.1 30.8 39.3 43.9
Standardized Precipitation Index -0.08 1.08 0.65 0.4 0.33 0.1 1.15 0.72 0.48 0.26 0.25 0.11 -0.03 0.31 0.67 0.35 -0.25 -0.5 -0.27 -0.15