Maryland Annual Rainfall and Climate Data, see below for individual cities 

 Maryland Average Annual Precipitation

Maryland city precipitation totals

City

Avg Annual Precip

Avg Annual Snow

 Avg # days of Precip

Avg # thunderstorm days

Avg # hail days

 Avg # severe thunderstorm watches per year Avg # tornado watches per year # of tornadoes reported in county, 1960-2010
Baltimore 41.94 21.5 113 27 1 3 12 2
Hagerstown 44.10 28.2 115 35 1 2 12 13
  • Maryland Annual Precipitation Average - 44.64 inches, 18th wettest state in the U.S.
  • Maryland Tornado Average -  3.2  per year -  34th most in the U.S.
  • Largest reported Tornado in Maryland from 1950-2011, 5/10/2008 - 880 yards / .50 miles wide
  • Date with highest number of reported Tornadoes in Maryland from 1950-2011, July 27th - 16 tornadoes
  • Average time of occurrence of reported Tornadoes in Maryland from 1950-2011 - 3:56 pm
  • Maryland Annual Lightning Density - 9.0 flashes per square mile - 19th highest in U.S.
  • Record Driest year in Maryland from 1895-2012 - 1930, avg precipitation 23.77 inches 
  • Record Wettest year in Maryland from 1895-2012 - 2003, avg precipitation 62.74 inches    

Maryland Precipitation Records

  • Driest location ranked by lowest annual average precipitation: Cumberland, central Maryland, 37.21"
  • Wettest location ranked by highest annual average precipitation: Benson, northeastern Maryland, 49.77"
  • Snowiest location ranked by highest annual average snowfall: Oakland, western Maryland, 95.9"
  • State precipitation maximum for 24 hours - Jewell, central Maryland, 7/26/1897, 14.75"
  • State precipitation maximum for 1 year - Salisbury, southeastern Maryland, 1948, 72.59"
  • State snow maximum for 24 hours - Clear Spring, northwestern Maryland, 3/29/1942, 31.0"
  • State snow maximum for 1 season - Deer Park, western Maryland, 1902-1902, 174.9"
  • Since 1870, Baltimore has encountered 20 snowstorms of 12 inches or greater
  • During the 1949-1950 winter season, Baltimore experienced only .7 inches of snow, the lowest total for 1 season in history. In contrast, Baltimore endured its highest month of snowfall ever with 40.5" during February 2003.
  • The winter of 2009-2010 was the snowiest season ever in Baltimore, with the city receiving 77.0 inches. This broke the previous record of 62.95 inches set in 1995-1996

Data sources: National Climatic Data Center, Severe thunderstorm / tornado watch data period is 1999 - 2008, NOAA Storm Prediction Center, Tornado climate data - NOAA Storm Prediction Center, State lightning flash density average - 1997-2011, Vaisala