Standardized Precipitation Index Table

High Plateau (R) Climate Division

Oregon, Climate Division 05

Precipitation Data Table

Time Scale in Months (As of the end of Feb. 2026)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 2.66 4.13 9.73 11 12.79 13.86 14.48 15.26 15.57 16.3 17.32 21.57 36.31 44.18 51.15 67.42 78.91 101.9 119.15 138.23
Accumulated Precipitation Departure from Normal (in.) -0.35 -2.66 -1.13 -3.36 -3.38 -3.21 -3.08 -2.79 -3.68 -4.64 -5.44 -3.94 -0.07 1.58 0.11 -0.61 2.43 -0.01 -8.24 -14.69
Accumulated Precipitation Percent of Average 88 61 90 77 79 81 82 85 81 78 76 85 100 104 100 99 103 100 94 90
Accumulated Precipitation Percentile (non-exceedance) 49.4 14.9 42.2 25.2 26.2 27.2 27.4 29.9 23.6 18.4 13.9 23.8 52 60.7 52.5 49.3 61.2 51.5 28 16.5
Standardized Precipitation Index -0.01 -1.04 -0.2 -0.67 -0.64 -0.61 -0.6 -0.53 -0.72 -0.9 -1.08 -0.71 0.05 0.27 0.06 -0.02 0.28 0.04 -0.58 -0.98