Standardized Precipitation Index Table

West Central Climate Division

Oklahoma, Climate Division 04

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.) 3.38 5.52 8.07 8.9 11.89 12.83 14.23 15.34 16.65 18.42 21.19 23.95 40.8 47.78 67.28 79.46 92.54 122.06 149.68 185.1
Accumulated Precipitation Departure from Normal (in.) 1.06 -0.35 -1.98 -3.76 -2.45 -2.52 -1.91 -1.85 -1.94 -2.54 -2.51 -2.38 4.4 6.08 14.55 11.43 13.52 16.76 18.11 27.27
Accumulated Precipitation Percent of Average 146 94 80 70 83 84 88 89 90 88 89 91 112 115 128 117 117 116 114 117
Accumulated Precipitation Percentile (non-exceedance) 79.2 50.4 29.8 13.9 28.2 28.7 35.5 36.5 36.4 32.7 33.5 35.4 75.8 81 95.8 89 90.9 91.8 91.3 96.7
Standardized Precipitation Index 0.81 0.01 -0.53 -1.08 -0.58 -0.56 -0.37 -0.34 -0.35 -0.45 -0.43 -0.37 0.7 0.88 1.72 1.23 1.33 1.39 1.36 1.84