Standardized Precipitation Index Table

East Central Climate Division

Oklahoma, Climate Division 06

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.) 4.86 6.54 14.64 19.68 26.87 29.8 35.55 36.8 41.21 50.55 53.94 60.74 79.11 89.91 117.3 144.67 161.91 205.6 258.18 319.71
Accumulated Precipitation Departure from Normal (in.) 1.44 -1.45 0.88 1.4 5.09 5.72 9.17 7.8 9.05 14.52 13.86 17.39 22.01 22.52 30.66 34.03 32.05 32.55 41.95 60.31
Accumulated Precipitation Percent of Average 142 82 106 108 123 124 135 127 128 140 135 140 139 133 135 131 125 119 119 123
Accumulated Precipitation Percentile (non-exceedance) 78.1 37.1 62 64.2 82.1 83.1 91.1 87.2 89.3 96.1 94.2 97.1 98 97 98.5 98.3 96.9 94.6 96.4 99
Standardized Precipitation Index 0.78 -0.33 0.3 0.36 0.92 0.96 1.35 1.14 1.24 1.76 1.57 1.9 2.06 1.89 2.16 2.13 1.87 1.6 1.8 2.31