Standardized Precipitation Index Table

Northern Central Climate Division

Maryland, Climate Division 06

Precipitation Data Table

Time Scale in Months (As of the end of Feb. 2026)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 1.96 4.5 6.35 7.83 10.25 12.7 14.44 19.62 23.84 32.79 35.77 37.94 44.39 49.77 75.07 98.74 116.77 160.35 203.25 251.84
Accumulated Precipitation Departure from Normal (in.) -0.86 -1.5 -3.03 -4.62 -5.53 -6.88 -9.35 -8.36 -8.16 -3.16 -3.72 -5.15 -8.14 -12.99 -11.19 -7.32 -12.77 -12.47 -12.85 -7.55
Accumulated Precipitation Percent of Average 70 75 68 63 65 65 61 70 75 91 91 88 85 79 87 93 90 93 94 97
Accumulated Precipitation Percentile (non-exceedance) 28.7 21.4 10.5 6.6 5.9 4.3 1.5 4.4 6.4 31.7 28.9 21.7 12.5 4.7 12 25.4 13.9 18.5 21.2 34.2
Standardized Precipitation Index -0.56 -0.79 -1.26 -1.51 -1.57 -1.72 -2.18 -1.7 -1.52 -0.48 -0.56 -0.78 -1.15 -1.67 -1.18 -0.66 -1.09 -0.9 -0.8 -0.41