Standardized Precipitation Index Table

Northwest Climate Division

Connecticut, Climate Division 01

Precipitation Data Table

Time Scale in Months (As of the end of Nov. 2019)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 3.03 9.98 12.11 15.48 18.73 21.49 26.37 33.65 35.87 38.86 44.69 49.47 70.94 88.67 111.69 134.88 157.2 194.09 235.04 282.5
Accumulated Precipitation Departure from Normal (in.) -1.11 1.8 -0.42 -1.53 -2.6 -4.03 -3.3 -0.09 -2 -2.35 -0.16 0.62 9.56 14.26 13.99 11.73 10.79 -0.96 -8.78 -10.17
Accumulated Precipitation Percent of Average 73 122 97 91 88 84 89 100 95 94 100 101 116 119 114 110 107 100 96 97
Accumulated Precipitation Percentile (non-exceedance) 33.3 74.9 49.8 40.3 32.2 23.7 29.9 51.8 39.6 37.5 51 55.4 86.9 92.7 89.7 82.7 78.5 48.8 32.8 32.2
Standardized Precipitation Index -0.43 0.67 -0.01 -0.24 -0.46 -0.72 -0.53 0.05 -0.26 -0.32 0.03 0.14 1.12 1.45 1.26 0.94 0.79 -0.03 -0.44 -0.46