Standardized Precipitation Index Table

South Coast Drainage Climate Division

California, Climate Division 06

Precipitation Data Table

Time Scale in Months (As of the end of Jan. 2026)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 2.84 7.94 13.45 14.81 15.28 15.37 15.38 15.44 15.73 16.14 19.38 22.82 24.04 24.17 40.3 47.51 61.39 81.08 92.49 107.9
Accumulated Precipitation Departure from Normal (in.) -0.82 1.6 5.6 6.28 6.54 6.51 6.45 6.46 6.33 5.49 5.67 5.45 -1.18 -2.04 5.56 3.87 9.28 11.61 5.62 3.52
Accumulated Precipitation Percent of Average 78 125 171 174 175 174 172 172 167 152 141 131 95 92 116 109 118 117 106 103
Accumulated Precipitation Percentile (non-exceedance) 52.9 71.6 88.5 89.6 90.4 90.3 90.1 90.2 89.9 87.8 86.1 82 48.1 43.6 74.1 66.6 79 80.2 65.8 60
Standardized Precipitation Index 0.07 0.57 1.2 1.26 1.3 1.3 1.29 1.29 1.28 1.17 1.09 0.92 -0.05 -0.16 0.65 0.43 0.81 0.85 0.41 0.25