Standardized Precipitation Index Table

Northern Cascades (S) Climate Division

Oregon, 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.) 0.36 5.15 10.82 14.57 21 27.91 46.05 52.79 55.5 60.48 66.52 67.52 72.91 102.62 136.47 161.8 208.28 307.2 391.39 458.55
Accumulated Precipitation Departure from Normal (in.) -0.49 1.1 2.03 -0.39 -2.8 -4.95 1.3 -4.41 -13.54 -14.98 -12 -12.14 -15.53 -9.95 -22.9 -30.45 -30.72 -11.51 -6.89 -19.27
Accumulated Precipitation Percent of Average 42 127 123 97 88 85 103 92 80 80 85 85 82 91 86 84 87 96 98 96
Accumulated Precipitation Percentile (non-exceedance) 35.8 74.3 76.8 49.7 33.2 25.3 58.4 35.6 13.7 12.2 18.7 18.1 13 26.1 9.7 5.3 8.3 33.9 41.8 28.5
Standardized Precipitation Index -0.36 0.65 0.73 -0.01 -0.43 -0.66 0.21 -0.37 -1.09 -1.17 -0.89 -0.91 -1.13 -0.64 -1.3 -1.61 -1.38 -0.41 -0.21 -0.57