Standardized Precipitation Index Table

Central Coast Drainage Climate Division

California, Climate Division 04

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.) 2.46 2.51 7.6 10.88 14.73 19.26 21.09 21.42 21.42 21.44 21.45 21.54 30.72 36.34 37.08 61.93 63.17 98.14 112.98 124.28
Accumulated Precipitation Departure from Normal (in.) 0.98 -2.29 -1.09 -2.23 -2.11 0.29 1.22 1.35 1.33 1.33 1.26 0.82 1.31 -3.35 -4.35 1.53 1.02 15.21 9.36 -0.09
Accumulated Precipitation Percent of Average 166 52 88 83 87 102 106 107 107 107 106 104 104 92 90 103 102 118 109 100
Accumulated Precipitation Percentile (non-exceedance) 82 24.7 47.3 41.6 42 56.5 61.3 62 61.9 61.9 61.5 59 59.9 40 36.3 57.5 55.9 85.9 73.8 51.6
Standardized Precipitation Index 0.92 -0.68 -0.07 -0.21 -0.2 0.16 0.29 0.31 0.3 0.3 0.29 0.23 0.25 -0.25 -0.35 0.19 0.15 1.07 0.64 0.04