Severe Thunderstorms in the Northeast and Northern Plains; Critical Fire Weather in the West

Scattered severe thunderstorms capable of damaging wind gusts and hail are forecast across the Northeast U.S. and North Dakota today. Heavy to excessive rainfall is possible over eastern New Mexico into western Texas and over the western Florida peninsula today. Critical fire weather conditions will persist today over parts of the interior Northwest and Great Basin. Read More >

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 1991-2020)
Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec

**Tri-Cities Climatological Data**

(1991-2020 normals unless otherwise noted; POR is "Period of Record")
Average Rainfall..... 43.97"	Avg number of days >= 90 F° (POR).....19 days
Average Snowfall..... 9.2"	Avg number of days <= 32 F° (POR)..... 94 days
Median first frost..... October 15th	Median last frost..... April 29th
Median first freeze..... October 24th	Median last freeze..... April 16th
Thanksgiving average temp (POR)..... 43.7 F	Thanksgiving average rainfall (POR)..... 0.09"
Easter average temp (POR)..... 54.3 F	Easter average rainfall (POR).....0.09"

**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	1.83"	April 12, 2020
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
	0.7"	2020
	0.4"	1979
	0.2"	1993
	0.2"	1962

Last updated on 6/25/2022

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
10.47
9.56
7.55
9.71
8.37
12.70
11.34
7.66
6.60
6.74
6.75


 
2013
2019
1955
2020
1950
2013
2012
2003
2024
2019
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

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	10.47	9.56	7.55	9.71	8.37	12.70	11.34	7.66	6.60	6.74	6.75
	2013	2019	1955	2020	1950	2013	2012	2003	2024	2019	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