Standardized Precipitation Index Table

Central Climate Division

Connecticut, Climate Division 02

Precipitation Data Table

Time Scale in Months (As of the end of Aug. 2020)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 2.18 4.97 7.64 10.52 15.86 19.83 23.06 25.12 31.73 34.62 41.69 43.58 55.38 70.46 106.44 132.45 156.38 198.59 236.31 275.37
Accumulated Precipitation Departure from Normal (in.) -2 -3.18 -4.29 -5.25 -4 -4.18 -4.28 -5.86 -3.32 -4.5 -1.31 -3.37 -3.53 -0.54 12.5 14.49 15.65 11.15 2.15 -5.61
Accumulated Precipitation Percent of Average 52 61 64 67 80 83 84 81 91 88 97 93 94 99 113 112 111 106 101 98
Accumulated Precipitation Percentile (non-exceedance) 14.1 9.1 8.3 7.7 17.2 18.4 18.3 11.2 27.7 23.1 44.1 33.3 34.8 49.3 87.2 87.3 86.5 75 55.5 40.7
Standardized Precipitation Index -1.08 -1.34 -1.39 -1.43 -0.94 -0.9 -0.9 -1.21 -0.59 -0.73 -0.15 -0.43 -0.39 -0.02 1.14 1.14 1.11 0.68 0.14 -0.24