Standardized Precipitation Index Table

Central Climate Division

Massachusetts, Climate Division 02

Precipitation Data Table

Time Scale in Months (As of the end of Mar. 2024)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 8.61 9.8 16.89 24.19 26.13 29.29 36.73 42.14 52.5 57.04 60.45 64.14 76.19 89.31 109.17 131.64 167.06 208.91 259.28 318.82
Accumulated Precipitation Departure from Normal (in.) 4.68 2.65 6.2 9.57 7.61 7.01 10.58 12.1 18.51 19.22 19.06 18.91 20.32 21.89 18.9 19.15 31.69 28.6 34.09 48.78
Accumulated Precipitation Percent of Average 219 137 158 165 141 131 140 140 154 151 146 142 136 132 121 117 123 116 115 118
Accumulated Precipitation Percentile (non-exceedance) 97.9 88.5 98.5 99.8 98.2 95.3 98.6 98.6 99.8 99.8 99.7 99.6 99.6 99.2 96.1 94 98.6 95.4 95.6 98.3
Standardized Precipitation Index 2.03 1.2 2.16 2.85 2.1 1.67 2.19 2.19 2.92 2.86 2.74 2.61 2.64 2.4 1.76 1.55 2.2 1.68 1.71 2.13