Standardized Precipitation Index Table

Lower Southern Climate Division

Maryland, Climate Division 03

Precipitation Data Table

Time Scale in Months (As of the end of Apr. 2026)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 1.07 2.77 5.19 7.97 10.04 11.31 13.03 16.78 18.06 25.01 28.67 35.37 45.68 51.53 66.91 92.05 109.92 151.29 193.39 254
Accumulated Precipitation Departure from Normal (in.) -2.26 -4.2 -4.64 -5.08 -6.24 -7.85 -9.35 -9.24 -12.32 -9.83 -10.07 -7.19 -6.75 -10.33 -18.34 -12.58 -18.16 -19.62 -20.35 -2.59
Accumulated Precipitation Percent of Average 32 40 53 61 62 59 58 64 59 72 74 83 87 83 78 88 86 89 90 99
Accumulated Precipitation Percentile (non-exceedance) 2.2 0.7 1.7 2.9 2.4 1.6 0.8 2.1 0.6 4.1 4.7 13.9 18.3 9.8 2.6 11.3 6.2 8.4 10.7 45.3
Standardized Precipitation Index -2.02 -2.45 -2.13 -1.9 -1.97 -2.15 -2.4 -2.02 -2.51 -1.74 -1.67 -1.08 -0.9 -1.3 -1.95 -1.21 -1.54 -1.38 -1.24 -0.12