Standardized Precipitation Index Table

St. Lawrence Valley Climate Division

New York, Climate Division 08

Precipitation Data Table

Time Scale in Months (As of the end of May 2025)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 3.55 6.67 9.37 12.35 14.1 17.34 20.05 22.06 23.52 31.31 37.58 43.46 53.49 62.39 86.65 106.15 128.4 173.06 206.59 245.86
Accumulated Precipitation Departure from Normal (in.) 0.31 0.46 0.52 1.14 0.3 0.53 0.03 -1.46 -3.62 0.52 3.04 5.28 6.47 7.44 10.37 13.09 14.04 20.64 16.17 17.38
Accumulated Precipitation Percent of Average 110 107 106 110 102 103 100 94 87 102 109 114 114 114 114 114 112 114 108 108
Accumulated Precipitation Percentile (non-exceedance) 63.9 63.1 62.5 70.3 57.1 59.5 52.5 36.4 19.2 56.6 75.8 86.8 89.5 90.6 92.3 94.9 93.4 96.3 88.9 87.3
Standardized Precipitation Index 0.36 0.33 0.32 0.53 0.18 0.24 0.06 -0.35 -0.87 0.17 0.7 1.12 1.25 1.32 1.43 1.64 1.51 1.79 1.22 1.14