Standardized Precipitation Index Table

Central Climate Division

Connecticut, Climate Division 02

Precipitation Data Table

Time Scale in Months (As of the end of Apr. 2026)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 2.3 7.05 8.76 11.01 14.54 16.75 22.24 25.44 28.18 32.39 34.59 42.51 52.37 61.33 83.36 116.51 151.96 197.73 252.23 292.36
Accumulated Precipitation Departure from Normal (in.) -1.78 -1.19 -2.77 -4.16 -4.73 -6.53 -4.93 -5.74 -7.19 -7.04 -8.58 -4.54 -6.23 -9.06 -10.79 -1.05 10.63 9.47 17.12 10.45
Accumulated Precipitation Percent of Average 56 86 76 73 75 72 82 82 80 82 80 90 89 87 89 99 108 105 107 104
Accumulated Precipitation Percentile (non-exceedance) 14.8 35.9 16.6 9.6 10 5.4 15.9 14.9 11.6 14 10.3 27.2 21.6 15.2 16.9 47.9 78 72.2 81.5 69.2
Standardized Precipitation Index -1.05 -0.36 -0.97 -1.3 -1.28 -1.61 -1 -1.04 -1.19 -1.08 -1.26 -0.61 -0.78 -1.03 -0.96 -0.05 0.77 0.59 0.9 0.5