Standardized Precipitation Index Table

Central Eastern Shore Climate Division

Maryland, Climate Division 02

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.) 5.86 9.66 13.98 17.13 18.46 20.8 22.77 22.88 24.98 27.7 32.91 34.95 47.35 63.25 83.34 100.32 121.84 164.88 226.01 262.76
Accumulated Precipitation Departure from Normal (in.) 2.18 2.57 3.02 3.15 1.1 0.05 -1.02 -4.2 -5.7 -7.73 -6.93 -8.71 -7.24 -1.21 -4.09 -7.9 -9.38 -10.16 7.14 0.17
Accumulated Precipitation Percent of Average 159 136 128 122 106 100 96 84 81 78 83 80 87 98 95 93 93 94 103 100
Accumulated Precipitation Percentile (non-exceedance) 88.2 87.7 86.3 84.5 64.9 53 43.4 19 13.4 7.9 12.5 8.2 15.9 45.4 33.5 20.9 18.2 20.1 70.4 51.2
Standardized Precipitation Index 1.18 1.16 1.1 1.02 0.38 0.07 -0.17 -0.88 -1.11 -1.41 -1.15 -1.39 -1 -0.12 -0.42 -0.81 -0.91 -0.84 0.54 0.03