Standardized Precipitation Index Table

Northern Climate Division

Virginia, Climate Division 04

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.) 8.56 10.89 12.12 15.34 16.73 19.16 20.65 21.74 26.84 33.68 35.95 37 47.28 59.35 78.07 92.99 114.64 154.8 201.77 239.66
Accumulated Precipitation Departure from Normal (in.) 4.6 3.69 1.73 2.47 1.04 0.59 -0.73 -2.89 -1.3 1.51 -0.16 -3.11 -3.2 0.6 -2.24 -5.93 -5.86 -5.91 0.9 -1.35
Accumulated Precipitation Percent of Average 216 151 117 119 107 103 97 88 95 105 100 92 94 101 97 94 95 96 100 99
Accumulated Precipitation Percentile (non-exceedance) 98.3 93.9 76.6 81.3 65.1 58.8 45.8 27.4 42.2 63.1 50.9 31.2 32.6 54.9 41.1 26.9 29.5 32.6 53.4 47.5
Standardized Precipitation Index 2.12 1.54 0.73 0.89 0.39 0.22 -0.11 -0.6 -0.2 0.33 0.02 -0.49 -0.45 0.12 -0.23 -0.61 -0.54 -0.45 0.09 -0.06