Tri-Cities climate normals and records

(records began in 1934)

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 1971-2000)
Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec

Tri-Cities Annual Averages
Precipitation.....41.3 inches	Days with 0.01" or more of precipitation.....135
Snowfall.....15.0 inches	Days with 1.0" or more of snowfall.....5
Days with thunderstorms.....42	Days at or above 90 F.....13
Days with dense fog.....45	Days at or below 32 F.....94
Average first freeze.....October 21	Average last freeze.....April 17
Average first frost.....October 13	Average last frost.....April 30

Tri-Cities All-Time Records
All Time Highest Temperature	102 F	July 29, 1952
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	11.34"	August 2003
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	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
	0.5"	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	56.0	61.8	71.2	77.9	79.6	79.0	72.9	63.6	55.3	47.5
	1950	1938	1945	1954	1962	1952	1993	2007	1970	1984	1985	1956
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	9.18	7.75	9.56	7.03	9.71	7.37	9.73	11.34	7.09	5.65	6.74	6.75
	1957	1994	1955	1998	1950	1998	1949	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

National Weather Service Weather Forecast Office