Tri-Cities Climate Normals and Records
(records began in 1937)

Note: The following monthly climatological data is not considered official. For copies of official data, contact the National Climatic Data Center.

Daily and Monthly Climate Normals and Records
('Normals' are thirty year averages based on the period 1981-2010)
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec


Tri-Cities Annual Averages
Precipitation.....41.01 inches Days with 0.01" or more of precipitation.....134.4
Snowfall.....13.3 inches Days with 1.0" or more of snowfall.....3.9
Days with thunderstorms.....42.3 Days at or above 90 F.....14.4
Days with dense fog.....47.6 Days at or below 32 F.....97.2
Average first freeze.....October 20 Average last freeze.....April 18
Average first frost.....October 10 Average last frost.....April 30


Tri-Cities All-Time Records
All Time Highest Temperature 102.5 F June 30, 2012
All Time Lowest Temperature -21 F January 21, 1985
Most Rain in One Hour 2.83" September 2, 1978
Most Rain in 24 Hours 3.65" October 16, 1964
Most Rain in One Month 12.70" July 2012
Most Rain in One Year 65.65" 2003
Most Snow in 24 Hours 16.2" November 21, 1952
Most Snow in One Season 51" 1959-60
Snowfall on Christmas 1.2" 2010
  Trace 2003
  0.5" 2002
  Trace 1999
  Trace 1995
  0.2" 1993
  2.1" 1992
  0.9" 1985
  3.0" 1981
  Trace 1980
  Trace 1977
  0.8" 1976
  1.0" 1970
  10.0" 1969
Strongest Wind Gust 66 MPH May 9, 2003


Warmest/Coldest Monthly Average Temperatures
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Warmest 50.1 47.7 56.9 61.8 71.2 77.9 79.6 79.0 72.9 63.6 55.3 47.5
  1950 1938 2012 1954 1962 1952 1993 2007 1970 1984 1985 1971
Coldest 22.1 28.1 33.5 50.5 58.3 67.4 69.8 69.5 62.6 50.2 38.8 27.8
  1977 1958 1960 1983 1997 1972 1967 1946 1967 1988 1976 1963


Wettest/Driest Monthly Precipitation Totals
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Wettest 9.99 7.75 9.56 7.03 9.71 7.37 12.70 11.34 7.09 5.65 6.74 6.75
  2013 1994 1955 1998 1950 1998 2012 2003 1972 1959 2003 1961
Driest 1.06 0.75 1.31 0.21 0.76 0.75 0.67 0.37 0.50 0.02 0.50 0.21
  1940 1968 1985 1976 2007 1986 1995 2007 1985 2000 2001 1965

 


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