Standardized Precipitation Index Table

Southwestern Climate Division

West Virginia, Climate Division 03

Precipitation Data Table

Time Scale in Months (As of the end of May 2020)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 6.55 12.69 17.12 22.73 26.43 32.31 35.56 40.96 41.26 45.08 48.84 53.99 65.46 80.6 113.33 139.15 162.45 209.72 256.25 303.09
Accumulated Precipitation Departure from Normal (in.) 2.37 4.74 5 7.37 7.47 9.83 9.96 12.52 9.67 9.47 8.32 9.23 8.62 13.36 23.81 27.19 28.29 30.94 32.9 35.11
Accumulated Precipitation Percent of Average 157 160 141 148 139 144 139 144 131 127 121 121 115 120 127 124 121 117 115 113
Accumulated Precipitation Percentile (non-exceedance) 90.9 97.7 95.8 98 97.4 98.6 98.1 99.1 96.2 95.2 92.6 93.6 90.2 95.6 99.4 99.5 99.4 99.4 99.3 99.2
Standardized Precipitation Index 1.34 2 1.72 2.06 1.95 2.19 2.07 2.39 1.78 1.66 1.45 1.52 1.3 1.71 2.51 2.61 2.53 2.52 2.46 2.4