Standardized Precipitation Index Table

NE Olympic San Juan Climate Division

Washington, Climate Division 02

Precipitation Data Table

Time Scale in Months (As of the end of Feb. 2024)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 1.81 6.33 11.19 14.22 16.52 17.99 18.66 19.06 19.86 20.68 22.81 24.65 33.26 39.97 50.79 76.03 81.33 113.01 141.02 166.38
Accumulated Precipitation Departure from Normal (in.) -0.86 -0.05 0.7 -0.35 -0.75 -0.88 -1.15 -1.52 -2.13 -2.96 -2.71 -3.37 -5.26 -6.94 -5.29 1.04 -2.81 0.85 0.87 -1.71
Accumulated Precipitation Percent of Average 68 99 107 98 96 95 94 93 90 87 89 88 86 85 91 101 97 101 101 99
Accumulated Precipitation Percentile (non-exceedance) 22.8 52.6 64 48.3 44 42.7 39.8 35.8 30.2 23.1 24.8 20 14.9 11.2 20.1 56.7 37.5 54.6 54.3 45.1
Standardized Precipitation Index -0.75 0.07 0.36 -0.04 -0.15 -0.18 -0.26 -0.36 -0.52 -0.74 -0.68 -0.84 -1.04 -1.22 -0.84 0.17 -0.32 0.12 0.11 -0.12