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 103 F June 30, 2012
All Time Lowest Temperature -21 F January 21, 1985
Most Rain in One Day 3.65" October 16, 1964
Most Rain in One Month 12.70" July 2012
Most Rain in One Year 65.64" 2003
Most Snow in One Day 16.2" November 21, 1952
Most Snow in One Season 51" 1959-60
Snowfall on Christmas 1.2" 2010
  0.2" 1993
  2.1" 1992
  0.9" 1985
  3.0" 1981
  0.4" 1979
  0.8" 1976
  0.9" 1970
  8.7" 1969
  0.2" 1962

 For additional information via a searchable database:

www.nws.noaa.gov/climate/xmacis.php


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