Standardized Precipitation Index Table

South Central Climate Division

Oklahoma, Climate Division 08

Precipitation Data Table

Time Scale in Months (As of the end of Jul. 2020)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 3.54 6.13 12.49 15.81 22.89 25.68 30.86 31.84 34.8 40.44 43.28 48.14 64.46 73.22 106.65 128.62 142.25 179.78 229.69 289.13
Accumulated Precipitation Departure from Normal (in.) 0.67 -0.87 0 -0.55 3.6 4.3 7.63 6.33 6.74 8.71 7.96 10.09 13.92 13.83 30.55 31.21 28.25 27.84 39.76 61.31
Accumulated Precipitation Percent of Average 123 88 100 97 119 120 133 125 124 127 123 127 128 123 140 132 125 118 121 127
Accumulated Precipitation Percentile (non-exceedance) 70.4 45 54.6 49.6 76.5 78.9 88.9 84.3 84.3 87.1 84.4 89.1 92.3 90.4 99.2 98.6 97.3 95 98.2 99.8
Standardized Precipitation Index 0.54 -0.13 0.12 -0.01 0.72 0.8 1.22 1.01 1.01 1.13 1.01 1.23 1.43 1.3 2.41 2.19 1.93 1.64 2.09 2.89