Standardized Precipitation Index Table

Northeast Climate Division

Oklahoma, Climate Division 03

Precipitation Data Table

Time Scale in Months (As of the end of Jan. 2026)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 1.25 1.28 3.32 7.37 10.84 14.81 18.29 29.63 35.78 45.83 48.34 49.16 60.58 66.28 88.18 105.85 126.28 161.53 199.63 245.48
Accumulated Precipitation Departure from Normal (in.) -0.42 -2.29 -2.88 -2.31 -2.86 -2.26 -2.19 4.31 4.97 11 10.5 9.58 14.78 9.62 9.1 9.64 7.65 3.28 1.8 8.05
Accumulated Precipitation Percent of Average 75 36 54 76 79 87 89 117 116 132 128 124 132 117 112 110 106 102 101 103
Accumulated Precipitation Percentile (non-exceedance) 45.5 4.8 12.9 28.4 28.7 34.7 36.7 77.7 78.2 93.1 91.1 88.6 94.8 83.6 78.6 77 70.7 58.8 54.9 65.4
Standardized Precipitation Index -0.11 -1.67 -1.13 -0.57 -0.56 -0.39 -0.34 0.76 0.78 1.48 1.35 1.2 1.62 0.98 0.79 0.74 0.55 0.22 0.12 0.4