National Weather Service United States Department of Commerce

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. Additional normals data can be found at: https://www.ncdc.noaa.gov/cdo-web/datatools/normals.

 

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

(1981-2010 unless otherwise noted; POR is "Period of Record")

Average Rainfall..... 41.01"                                   

Avg number of days >= 90 F° (POR).....19 days

Average Snowfall..... 13.3"  

Avg number of days <= 32 F° (POR)..... 94 days

Median first frost..... October 11th

Median last frost..... May 1st

Median first freeze..... October 20th

Median last freeze..... April 19th

Thanksgiving avg temp..... 43.9 F

Thanksgiving avg rainfall..... 0.1"

Easter avg temp..... 54.6"

Easter avg rainfall.....0.08"

 

 
Tri-Cities Records

Highest Temperature

   103 F    June 30, 2012

Lowest Temperature

     -21 F     January 21, 1985

Highest rainfall total in one day

3.65" October 16, 1964

Highest rainfall total in one month

12.70" July 2012

Highest rainfall total in one year

65.64" 2003

Most snow in one day

16.2" November 21, 1952

Most snow in one month

27.9" March 1960

Most Snow in one season (Dec - Feb)

32.8" 1963 - 1964

Most snow in one year

51.0" 1959 - 1960

Easter highest rainfall total

    0.66"     March 30, 1975

Easter highest snowfall total

0.3" March 29, 1964

Easter warmest temperature

85 F

  April 24, 2011  &  April 16, 2006  &  

April 21, 1957

Easter coldest temperature

21 F April 8, 2007  &  March 24, 1940

Thanksgiving highest rainfall total

1.49" November 25, 1999

Thanksgiving highest snowfall total

0.4" November 26, 1953

Thanksgiving warmest temperature

    73 F     November 22, 1979

Thanksgiving coldest temperature

15 F November 28, 2013

Measurable snowfall on Christmas Day

8.7" 1969

 

3.0" 1981

 

2.1" 1992

 

1.2" 2010

 

0.9" 1985

 

0.9" 1970

 

0.8" 1976

 

0.4" 1979
 

0.2"

1993
 

0.2"

1962
 
 
Last updated on 10/16/2018

 

 

 

For climate data queries, please visit NOWData at:   
http://w2.weather.gov/climate/xmacis.php?wfo=mrx
 
 
 
Helpful Information:
Frost data - search for temperatures at or below 36 degrees
Freeze data - search for temperatures at or below 32 degrees
 
 
Warmest/Coldest Monthly Average Temperatures
  JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Warmest 50.0 49.4 56.9 61.8 71.2 77.8 79.6 79.0 75.4 63.6 55.3 50.5
  1950 2018 2012 1954 1962 1952 1993 2007 2018 1984 1985 2015

Coldest 22.1 28.1 33.5 50.4 58.2 67.3 69.8 69.5 62.6 50.1 38.8 27.7
  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 8.37 12.70 11.34 7.09 6.20 6.74 6.75
  2013 1994 1955 1998 1950 2013 2012 2003 1972 2014 2003 1961

Driest 1.06 0.75 0.94 0.21 0.70 0.75 0.67 0.37 0.50 0.02 0.50 0.21
  1940 1968 2016 1976 2015 1986 1995 2007 1985 2000 2001 1965

 

 For additional information via a searchable database:

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