Standardized Precipitation Index Table

Northwest Climate Division

Connecticut, Climate Division 01

Precipitation Data Table

Time Scale in Months (As of the end of Jun. 2020)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 1.95 4.41 9.2 12.65 15.85 17.91 24.58 27.96 34.88 37.04 40.42 43.65 58.59 69.62 109.07 134.14 156.01 197.79 234.4 280.82
Accumulated Precipitation Departure from Normal (in.) -2.23 -3.9 -3.18 -3.86 -4 -5.56 -2.92 -3.68 -0.8 -2.99 -4.08 -5.18 -2.65 -2.73 11.36 12.94 9.54 2.63 -9.44 -11.83
Accumulated Precipitation Percent of Average 47 53 74 77 80 76 89 88 98 93 91 89 96 96 112 111 107 101 96 96
Accumulated Precipitation Percentile (non-exceedance) 11.5 4.9 15.6 15.3 15.1 8.4 27.3 24.1 46.6 32.6 28.5 24.1 38.6 39.2 85 85.6 76 57.5 31.4 29
Standardized Precipitation Index -1.2 -1.65 -1.01 -1.02 -1.03 -1.38 -0.6 -0.7 -0.08 -0.45 -0.57 -0.7 -0.29 -0.27 1.03 1.06 0.71 0.19 -0.49 -0.55