Standardized Precipitation Index Table

Lower Southern Climate Division

Maryland, Climate Division 03

Precipitation Data Table

Time Scale in Months (As of the end of Mar. 2024)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 6.12 7.74 13.62 20.4 22.94 24.21 28.98 31.8 36.64 39.08 40.81 45.39 50.59 61.14 85.43 100.89 127.18 189.8 228.52 296.01
Accumulated Precipitation Departure from Normal (in.) 2.45 1.21 3.87 7.38 7.01 5.03 6.16 4.59 4.98 3.5 1.43 2.66 -1.87 -0.77 -0.06 -3.86 -1.14 18.63 14.68 39.45
Accumulated Precipitation Percent of Average 167 119 140 157 144 126 127 117 116 110 104 106 96 99 100 96 99 111 107 115
Accumulated Precipitation Percentile (non-exceedance) 90.7 73.8 92 97.9 95.2 88.2 89.6 81.2 80.8 72.9 60.7 67 41.7 48 51.3 37 47.4 90 81.5 98.1
Standardized Precipitation Index 1.32 0.64 1.41 2.04 1.67 1.18 1.26 0.88 0.87 0.61 0.27 0.44 -0.21 -0.05 0.03 -0.33 -0.06 1.28 0.9 2.08