Standardized Precipitation Index Table

North Coast Drainage Climate Division

California, Climate Division 01

Precipitation Data Table

Time Scale in Months (As of the end of Mar. 2024)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 8.19 19.24 32.64 41.98 45.45 47 48.41 48.83 48.85 49.25 51.12 53.17 83.5 100.2 109.52 134.36 137.22 168.52 200.95 253.6
Accumulated Precipitation Departure from Normal (in.) 1.92 5.56 10.08 10.76 7.84 6.41 6.98 7.14 6.98 6.57 6.49 5.15 12.99 11.61 13.48 -2.06 -6.63 -23.43 -39.28 -35.01
Accumulated Precipitation Percent of Average 131 141 145 134 121 116 117 117 117 115 115 111 118 113 114 98 95 88 84 88
Accumulated Precipitation Percentile (non-exceedance) 74.5 81.5 87 85.5 76.6 72.6 74 74.5 74.1 73 72.4 68.6 80.2 75.2 77.6 48.8 41.1 20.4 9.8 14.9
Standardized Precipitation Index 0.66 0.9 1.13 1.06 0.73 0.6 0.64 0.66 0.64 0.61 0.59 0.48 0.85 0.68 0.76 -0.03 -0.23 -0.83 -1.29 -1.04