Standardized Precipitation Index Table

Northwestern Climate Division

West Virginia, Climate Division 01

Precipitation Data Table

Time Scale in Months (As of the end of Sep. 2020)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 2.13 6.02 9.03 13.56 19.42 25.18 30 34.34 38.25 43.54 46.39 52.44 63.4 76.71 101.66 138.81 163.8 212.05 253.78 300.16
Accumulated Precipitation Departure from Normal (in.) -1.09 -1.12 -2.69 -2.47 -0.65 1.49 2.48 3.9 4.42 6.35 6.18 9.35 8.57 9.94 15.57 29.04 34.75 40.24 39.3 42.94
Accumulated Precipitation Percent of Average 66 84 77 85 97 106 109 113 113 117 115 122 116 115 118 126 127 123 118 117
Accumulated Precipitation Percentile (non-exceedance) 27.7 33.7 16 23.5 45.8 65.8 72.2 79.6 81.5 88.7 87 94.1 90 91.3 96.5 99.7 99.9 99.9 99.8 99.8
Standardized Precipitation Index -0.59 -0.42 -1 -0.72 -0.11 0.41 0.59 0.83 0.9 1.21 1.13 1.57 1.28 1.36 1.81 2.74 3.09 3.23 2.9 2.88