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

 

Ohio 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
Akron 38.47 47.1 155 38 2 1 11 11
Cleveland 38.71 58.6 156 34 1 1 10 11
Columbus 38.52 28.1 137 40 2 3 15 24
Dayton 39.58 27.5 132 38 1 4 13 8
Mansfield 43.24 43.6 143 35 1 2 12 26
Toledo 33.21 37.1 136 37 1 3 12 7
Youngstown 38.02 56.8 160 33 1 1 11 12
  • Ohio Annual Precipitation Average - 39.16", 28th wettest in the U.S.
  • Ohio Tornado Average - 14.7 per year - 21st most in the U.S.
  • Largest reported Tornado in Ohio from 1950-2011, 6/2/1990 - 1,350 yards / .76 miles wide
  • Date with highest number of reported Tornadoes in Ohio from 1950-2011, July 12th - 36 tornadoes
  • Average time of occurrence of reported Tornadoes in Ohio from 1950-2011 - 4:36 pm
  • Ohio Annual Lightning Density - 11.2 flashes per square mile - 16th highest in U.S.
  • Record Driest year in Ohio from 1895-2012 - 1930, avg precipitation 26.59 inches 
  • Record Wettest year in Ohio from 1895-2012 - 2011, avg precipitation 55.88 inches


Ohio Precipitation Records 

  • Driest location ranked by lowest annual average precipitation: Middlebourne, west-central Ohio, 30.44"
  • Wettest location ranked by highest annual average precipitation: Cincinnati, southwestern Ohio, 47.54"
  • Snowiest location ranked by highest annual average snowfall: Chardon, northeastern Ohio, 97.0"
  • State precipitation record for 24 hours - Lockington Dam, western Ohio, 8/7-8/1995, 10.75"
  • State precipitation record for 1 year - Little Mountain, northeast Ohio, 1870, 70.82"
  • State snowfall record for 24 hours - Kings Mills, southwestern Ohio, 11/22-23/2004, 26.5"" 
  • State snow record for 1 season - Chardon, northeastern Ohio, 1959-1960, 161.5"
  • Ohio is one of the cloudiest places on Earth during the winter months. The cloudiest month is December when 
    sunshine is received only about 30% of the time, with only three to six clear days. This compares to the 
    well-known cloudy city of Seattle, Washington which also experiences only three to five clear days during December
  • Ohio winter snowfall ranges from under 16 inches in the southern counties to around 35 inches at Toledo in the 
    northwest, to over 90 inches in the extreme northeastern counties where lake effect snowfall dominates
  • Ohio temperature averages and extremes, Columbus climate extremes/averages, precipitation and temperature
    data for all U.S. states and interesting Top 10 U.S. climate extremes

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