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


 

Delaware city precipitation totals

City

Avg Annual Precip

Avg Snow Annual

 Avg. days of Precip Avg # thunderstorm days Avg # hail days Avg wind / record high wind
Dover 44.66 15.0 114 28 1 8.6 / 51 mph
Wilmington 42.81 21.4 116 29 1 9.0 / 58 mph
Delaware Annual  Precipitation Average - 45.68 inches, 16th wettest in U.S.
Delaware Tornado Average - 1.2 per year, 44th most in the U.S.

Delaware Precipitation Data 

  • Driest location ranked by lowest annual precipitation: Middletown, northern Delaware, 41.58"
  • Wettest location ranked by highest annual precipitation: Wilmington Reservoir, northern Delaware, 49.02"
  • Snowiest location ranked by highest annual snowfall: Wilmington, northern Delaware, 21.4"
  • State precipitation record for 24 hours - Vernon, central Delaware, 9/15-16/1999, 12.36" 
  • State precipitation record for 1 year - Lewes, southern Delaware, 1948, 72.75"
  • State snowfall record for 24 hours - Dover, central Delaware, 2/18-19/1979, 25.0"
  • State snow record for 1 season - Wilmington, northern Delaware, 1995-1996, 59.4"
  • August 1, 2009 through January 31, 2010 was the wettest period since record-keeping began for the state 
115 years ago. Delaware received 34.65 inches of precipitation, more than a foot above the average of 22.04"

Precipitation data for other U.S. states
Data source: National Climatic Data Center