Standardized Precipitation Index Table

Northwest Climate Division

Connecticut, 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.) 7.58 9.49 17.26 25.74 27.86 31.42 43.34 47.72 60.61 63.5 66.93 71.53 82.86 96.04 119.11 139.45 176.25 217.61 266.99 329.89
Accumulated Precipitation Departure from Normal (in.) 3.45 2.04 6.16 10.58 8.6 8.1 15.57 15.49 23.96 22.71 22 22.52 22.8 23.78 21.28 18.32 29.53 22.14 22.82 36.99
Accumulated Precipitation Percent of Average 183 127 156 170 145 135 156 148 165 156 149 146 138 133 122 115 120 111 109 113
Accumulated Precipitation Percentile (non-exceedance) 94.5 81.9 97.8 99.8 98.4 96 99.7 99.3 99.9 99.9 99.8 99.7 99.6 99.1 96.9 92.3 97.9 91 88.5 95.6
Standardized Precipitation Index 1.6 0.91 2.02 2.82 2.14 1.76 2.8 2.44 3.27 2.98 2.82 2.77 2.63 2.36 1.86 1.42 2.04 1.34 1.2 1.71