Standardized Precipitation Index Table

Southeast Climate Division

Oregon, Climate Division 09

Precipitation Data Table

Time Scale in Months (As of the end of Aug. 2020)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 0.14 0.3 2.79 4.65 5.29 6.35 7 9.3 10.91 11.38 11.84 13.15 14.16 20.17 28.47 33.31 38.94 54.25 66.84 78.87
Accumulated Precipitation Departure from Normal (in.) -0.24 -0.41 1.02 1.54 1.08 0.93 0.33 1.08 1.17 0.37 -0.08 0.66 -0.09 2.27 3.52 2.96 1.56 4.39 4.53 4.12
Accumulated Precipitation Percent of Average 37 42 157 150 126 117 105 113 112 103 99 105 99 113 114 110 104 109 107 106
Accumulated Precipitation Percentile (non-exceedance) 31.5 22.8 85.4 87.1 77.5 72.8 60.5 71.2 70.2 58.6 52 62.1 51.4 76.9 81.1 76.1 63.4 77 75.2 71.3
Standardized Precipitation Index -0.48 -0.74 1.06 1.13 0.76 0.61 0.27 0.56 0.53 0.22 0.05 0.31 0.03 0.74 0.88 0.71 0.34 0.74 0.68 0.56