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 Mar. 2024)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 8.57 17.82 36.72 50.42 58.55 64.71 67.98 68.53 68.56 69.66 71.46 80.86 101.46 130.22 161.01 214.19 225.42 299.87 371.15 433.36
Accumulated Precipitation Departure from Normal (in.) -0.22 -0.01 7.03 8.25 4.57 4.34 4.54 3.98 3.17 1.07 -1.88 1.33 -7.71 -9.65 1.96 -5.06 -12.92 -17.88 -26.09 -43.42
Accumulated Precipitation Percent of Average 97 100 124 120 108 107 107 106 105 102 97 102 93 93 101 98 95 94 93 91
Accumulated Precipitation Percentile (non-exceedance) 53.4 54.1 82.4 80.8 67 65.6 65.9 64.5 62.1 55.8 46.8 56.1 31.8 30.5 55.6 42.3 30.1 26.4 20.3 10.1
Standardized Precipitation Index 0.08 0.1 0.93 0.87 0.44 0.4 0.41 0.37 0.31 0.14 -0.08 0.15 -0.47 -0.51 0.14 -0.19 -0.52 -0.63 -0.83 -1.28