Standardized Precipitation Index Table

Coastal Climate Division

Connecticut, Climate Division 03

Precipitation Data Table

Time Scale in Months (As of the end of Sep. 2020)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 1.92 4.2 8.01 10.54 13.05 18.29 22.26 25.61 27.63 34.16 36.47 44.29 54.74 70.92 100.81 129.95 153.92 196.47 231.28 269.19
Accumulated Precipitation Departure from Normal (in.) -1.93 -3.71 -3.63 -4.72 -6.12 -5.04 -5.32 -5.35 -7 -4.6 -6.35 -2.35 -3.57 0.91 7.51 13.31 14.06 10.18 -1.4 -10.02
Accumulated Precipitation Percent of Average 50 53 69 69 68 78 81 83 80 88 85 95 94 101 108 111 110 105 99 96
Accumulated Precipitation Percentile (non-exceedance) 17.6 8.9 12.5 9.8 6.8 13.8 14.7 15.1 9.1 21.6 15.3 38.6 34.5 55.7 76.5 85.7 84.6 73.9 48 31.9
Standardized Precipitation Index -0.93 -1.35 -1.15 -1.3 -1.49 -1.09 -1.05 -1.03 -1.33 -0.79 -1.02 -0.29 -0.4 0.14 0.72 1.07 1.02 0.64 -0.05 -0.47