Standardized Precipitation Index Table

Northeastern Shore Climate Division

Maryland, Climate Division 05

Precipitation Data Table

Time Scale in Months (As of the end of Jan. 2026)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 2.65 4.47 5.8 7.7 10.22 12.07 19.06 22.12 29.41 32.81 36.1 38.03 43.71 49.19 70.86 94.72 112.57 156.13 199.26 249.6
Accumulated Precipitation Departure from Normal (in.) -0.64 -2.28 -3.97 -5.22 -6.4 -9.03 -6.37 -7.09 -3.49 -3.56 -4.03 -5.03 -9.19 -15.08 -15.34 -12.8 -16.88 -16.55 -16.66 -9.58
Accumulated Precipitation Percent of Average 81 66 59 60 61 57 75 76 89 90 90 88 83 77 82 88 87 90 92 96
Accumulated Precipitation Percentile (non-exceedance) 35.9 15.1 7.6 4.7 4.1 1.2 8.9 8.5 28.7 29.2 26.7 22.5 9.7 2.5 4.3 10.1 5.9 8.9 11.1 26.5
Standardized Precipitation Index -0.36 -1.03 -1.43 -1.67 -1.74 -2.25 -1.35 -1.37 -0.56 -0.55 -0.62 -0.76 -1.3 -1.97 -1.71 -1.28 -1.56 -1.35 -1.22 -0.63