Standardized Precipitation Index Table

North Central Climate Division

Oregon, Climate Division 06

Precipitation Data Table

Time Scale in Months (As of the end of May 2025)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 0.94 1.71 4.05 6.54 8.16 12.59 15.41 16.36 16.75 17.13 17.18 17.78 22.13 31.27 36.49 46.54 53.49 73 87.72 102.59
Accumulated Precipitation Departure from Normal (in.) -0.41 -0.99 -0.37 0.2 -0.72 1.05 1.33 0.87 0.46 0.42 0.15 -0.3 -0.37 1.66 0.33 -1.12 -0.73 0.71 -2.63 -5.83
Accumulated Precipitation Percent of Average 70 63 92 103 92 109 109 106 103 103 101 98 98 106 101 98 99 101 97 95
Accumulated Precipitation Percentile (non-exceedance) 34.7 18.3 43.4 58.1 39 68.7 70.1 63.9 58.4 58 54.3 48.4 47.5 68.9 54.7 42 45.7 55.7 36 22.6
Standardized Precipitation Index -0.39 -0.91 -0.17 0.2 -0.28 0.49 0.53 0.36 0.21 0.2 0.11 -0.04 -0.06 0.49 0.12 -0.2 -0.11 0.14 -0.36 -0.75