Standardized Precipitation Index Table

North Central Climate Division

Oklahoma, Climate Division 02

Precipitation Data Table

Time Scale in Months (As of the end of Jun. 2020)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 2.03 4.67 6.56 9.74 10.91 12.81 14.08 15.07 18.66 21.22 26.81 28 49.75 54.12 74.55 88.2 101.32 135.76 166.42 199.04
Accumulated Precipitation Departure from Normal (in.) -1.91 -3.55 -4.48 -3.21 -3.18 -2.15 -2.01 -2.59 -1.47 -1.79 0.76 -0.88 9.79 10.26 16.74 15.5 14.72 20.36 22.26 26.12
Accumulated Precipitation Percent of Average 51 57 59 75 77 86 88 85 93 92 103 97 125 123 129 121 117 118 115 115
Accumulated Precipitation Percentile (non-exceedance) 16.7 12.3 7.2 21.4 23.3 34 35.8 32.3 42.9 40.4 58 47.4 90.8 90.5 96.2 93.5 90.6 93.9 93.5 95
Standardized Precipitation Index -0.97 -1.16 -1.46 -0.79 -0.73 -0.41 -0.36 -0.46 -0.18 -0.24 0.2 -0.07 1.33 1.31 1.78 1.51 1.32 1.54 1.52 1.64