Standardized Precipitation Index Table

Central Climate Division

Connecticut, Climate Division 02

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.) 8.73 10.58 18.01 26.78 28.78 32.03 42.79 47.77 58.42 60.95 64.08 68.91 79.8 92.34 114.27 133.76 167.29 209.71 261.41 322.79
Accumulated Precipitation Departure from Normal (in.) 4.57 3.12 6.88 11.55 9.51 8.85 15.58 16.37 22.97 21.75 21.04 21.77 21.58 22.12 20.19 16.54 26.2 21.73 26.61 41.2
Accumulated Precipitation Percent of Average 210 142 162 176 149 138 157 152 165 155 149 146 137 131 121 114 119 112 111 115
Accumulated Precipitation Percentile (non-exceedance) 97.5 90.4 98.7 99.9 98.9 97.1 99.7 99.6 99.9 99.9 99.8 99.7 99.5 98.9 96.4 90.5 96.5 90.1 91.3 96.7
Standardized Precipitation Index 1.96 1.3 2.23 3.01 2.3 1.9 2.78 2.62 3.27 3 2.83 2.8 2.6 2.29 1.79 1.31 1.81 1.29 1.36 1.84