Standardized Precipitation Index Table

North Central Climate Division

Oregon, Climate Division 06

Precipitation Data Table

Time Scale in Months (As of the end of Apr. 2026)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 1.79 3.23 5.48 6.49 10.92 12.85 14.43 15.04 15.32 15.48 15.63 16.57 22.15 31.02 35.5 48.88 53.06 72.18 89.24 105.57
Accumulated Precipitation Departure from Normal (in.) 0.43 0.16 0.49 -1.03 0.72 0.11 0.28 0.1 -0.04 -0.2 -1.09 -1.5 -0.91 0.21 -0.66 0.02 -1.16 -0.1 -1.1 -2.82
Accumulated Precipitation Percent of Average 132 105 110 86 107 101 102 101 100 99 93 92 96 101 98 100 98 100 99 97
Accumulated Precipitation Percentile (non-exceedance) 76.1 60.2 65.9 31.1 64.7 54.5 56.6 54 52 49.7 37.8 33.5 41.2 53.8 45.4 51.5 42.8 50.5 44.8 36.6
Standardized Precipitation Index 0.71 0.26 0.41 -0.49 0.38 0.11 0.16 0.1 0.05 -0.01 -0.31 -0.43 -0.22 0.1 -0.12 0.04 -0.18 0.01 -0.13 -0.34