Standardized Precipitation Index Table

South Central Climate Division

Oregon, Climate Division 07

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.) 1.4 2.17 3.79 4.47 7.58 8.47 9.51 10.31 10.75 11.48 11.71 12.43 17.81 25.41 28.9 39.62 45.31 60.35 71.97 83.08
Accumulated Precipitation Departure from Normal (in.) 0.14 -0.6 -0.58 -1.86 -0.82 -1.79 -1.89 -1.77 -1.78 -1.45 -2.32 -3.05 -2.04 -0.34 -2.08 -1.57 -1.13 -1.56 -5.42 -9.82
Accumulated Precipitation Percent of Average 111 78 87 71 90 83 83 85 86 89 83 80 90 99 93 96 98 97 93 89
Accumulated Precipitation Percentile (non-exceedance) 65 30.7 37.7 14.3 38.6 26.2 25.6 27.5 26.6 31.5 21.3 15.8 28 48.6 33.4 39.7 43.8 42.4 25.2 13
Standardized Precipitation Index 0.38 -0.5 -0.31 -1.07 -0.29 -0.64 -0.65 -0.6 -0.62 -0.48 -0.8 -1 -0.58 -0.04 -0.43 -0.26 -0.15 -0.19 -0.67 -1.12