Standardized Precipitation Index Table

Tidewater Climate Division

Virginia, Climate Division 01

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.) 7.74 10.43 15.33 21.83 24.37 25.66 30.51 34.61 39.68 44 47.04 52.09 59.2 69.47 91.03 108.01 134.43 200.06 247.75 309.06
Accumulated Precipitation Departure from Normal (in.) 3.91 3.41 4.91 8.09 7.79 5.87 6.82 6.1 6.06 6.25 5.5 7.23 3.96 4.84 1.34 -1.49 -0.16 20.51 23.46 40.01
Accumulated Precipitation Percent of Average 202 149 147 159 147 130 129 121 118 117 113 116 107 107 101 99 100 111 110 115
Accumulated Precipitation Percentile (non-exceedance) 98.5 93.3 96 98.9 97.4 92.4 92.1 88.5 87.1 86.3 82.4 87.4 72.8 74.3 57.2 45.3 50.5 93.5 93.4 98.9
Standardized Precipitation Index 2.17 1.5 1.75 2.28 1.94 1.43 1.41 1.2 1.13 1.09 0.93 1.15 0.61 0.65 0.18 -0.12 0.01 1.52 1.51 2.28