Standardized Precipitation Index Table

Coastal Climate Division

Connecticut, Climate Division 03

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.) 8.96 10.91 18.01 26.33 28.79 32.17 40.33 44.95 52.66 54.66 57.68 62.61 73.18 85.18 105.24 124.55 153.03 194.6 247.25 306.28
Accumulated Precipitation Departure from Normal (in.) 4.7 3.3 6.7 10.89 9.32 8.85 13.08 13.66 17.59 16 15.12 15.89 15.2 15.22 11.94 7.94 13.05 8.02 14.17 26.73
Accumulated Precipitation Percent of Average 210 143 159 171 148 138 148 144 150 141 136 134 126 122 113 107 109 104 106 110
Accumulated Precipitation Percentile (non-exceedance) 97.5 91 98.4 99.7 98.5 96.8 99.2 98.8 99.6 99.1 98.5 98.4 97.3 95.2 87 75.3 83.7 70.2 78.8 90.7
Standardized Precipitation Index 1.97 1.34 2.15 2.79 2.18 1.85 2.4 2.27 2.69 2.37 2.17 2.14 1.93 1.67 1.13 0.68 0.98 0.53 0.8 1.32