Tri-Cities, WA: December

31 December 2025: December 2025 averaged 43°F in Tri-Cities, WA, the warmest December since 1917 (1923 excluded: 4 of 31 days missing; 1926 excluded: 5 of 31 days missing; 1928 excluded: 4 of 31 days missing; 4 more years excluded for missing days), 2nd warmest of 118.

December 2025

Mean temperature: 43°F; Warmest since 1917; 2nd warmest of 118
Precipitation: 1.76 in; Wettest since 2024; 18th wettest of 120

A normal December in Tri-Cities, WA (1991 to 2020): a mean temperature of 35.9°F, between 28.3°F and 38.6°F in eight years of ten and 0.88 in of precipitation, between 0.31 in and 1.97 in in eight years of ten.

The mean temperature of every December in Tri-Cities, WA since 1894: 43°F in 2025; the highest is 43.7°F, in 1917.

Normal range, 28.3 to 38.6°F

Every year, ranked, as a table

Every December in Tri-Cities, WA from 1894 to 2025, ranked: the mean temperature, the mean high and the mean low from the warmest, the precipitation from the wettest; a year missing more than a tenth of its days is not ranked.

Year	Mean, °F	Rank	High, °F	Rank	Low, °F	Rank	Precipitation, in	Rank	Days missing
2025	43	2	51.1	3	34.8	4	1.76	18	0
2024	38.4	20	44.2	35	32.6	18	2.16	6	0
2023	38.2	21	43.3	47	33.1	12	1.44	35	0
2022	25.7	114	32.2	123	19.3	114	0.59	96	0
2021	35.9	57	43.2	49	28.5	65	1.00	61	0
2020	36.1	53	42.1	67	30	47	0.63	90	0
2019	36.5	46	42.5	60	30.5	40	0.47	102	0
2018	37.5	29	44	37	31	32	0.88	65	0
2017	31.8	93	37.1	104	26.6	87	0.88	65	0
2016	27.9	108	36.6	108	19.1	115	0.65	88	0
2015	36.2	52	43	52	29.5	50	1.73	20	0
2014	36.5	46	43.9	40	29.1	58	1.15	47	0
2013	27.6	111	37	105	18.1	121	0.14	119	0
2012	38.6	16	44.7	26	32.5	19	1.21	43	0
2011	32.1	89	40.1	79	24.2	99	0.13	120	0
2010	34.1	74	40.4	78	27.7	75	1.83	14	0
2009	26.3	113	34.1	116	18.5	118	0.77	74	0
2008	28.4	107	37.4	102	18.8	116	0.86	68	1
2007	35.8	58	43.2	49	28.5	65	0.70	82	0
2006	32	90	37.6	101	26.4	88	1.66	22	0
2005	30.3	99	35.9	112	24.6	98	2.08	8	0
2004	37.4	32	45.3	21	29.5	50	0.68	86	0
2003	34.6	67	41.2	73	28.1	72	1.64	23	0
2002	39.3	10	44.7	26	33.8	10	2.11	7	0
2001	36.3	51	43.4	46	29.1	58	0.70	82	0
2000	31.7	96	36.2	110	27.2	79	0.60	94	0
1999	38.9	13	45.7	15	32.1	22	0.28	114	0
1998	35	63	44	37	25.9	92	0.90	64	0
1997	37	39	42.8	57	31.2	29	0.31	111	0
1996	32.3	86	38.8	90	25.7	95	3.20	2	0
1995	36	55	40.8	75	31.2	29	1.96	10	0
1994	37.9	23	44.8	24	31	32	1.08	54	0
1993	37.5	29	41.8	69	33.1	12	0.93	63	0
1992	33.4	81	39.8	82	27	83	1.11	52	0
1991	39.1	11	44.3	33	34	8	0.69	85	0
1990	27.9	108	34.1	116	22	108	0.63	90	3
1989	35.3	62	39.7	83	30.9	34	0.38	105	0
1988	34.2	72	39.7	83	28.7	62	0.38	105	0
1987	34.6	67	39.6	85	29.5	50	1.14	48	0
1986	34.1	74	37.9	96	30.3	43	0.88	65	0
1985	23	117	27.7	125	18.1	121	0.65	88	1
1984	28.6	106	36.9	107	20.3	113	0.79	72	0
1983			32.5	121			2.22	5	4
1982			43	52			1.53	30	6
1981	34.7	66	43.8	43	26	90	1.47	34	1
1980	37.8	25	45	23	30.6	37	1.64	23	1
1979	38.5	18	45.9	14	31.8	24	0.46	104	3
1978	31.2	97	40.1	79	22.2	106	0.82	70	0
1977	37.2	35	43.3	47	31.2	29	1.27	40	0
1976	33.5	80	39.9	81	27.1	80	0.38	105	0
1975	36.8	43	44.4	32	29.2	55	1.27	40	0
1974	39.8	6	48	6	31.6	26	1.03	57	1
1973	39.8	6	46.4	11	33.2	11	3.47	1	0
1972	30.1	102	37.7	99	22.5	105	1.31	37	0
1971	35	63	42.3	63	27.8	73	1.94	11	0
1970	34.6	67	41.8	69	27.4	77	0.29	112	1
1969	35.7	59	40.7	76	30.6	37	1.41	36	0
1968	34.1	74	39	87	28.2	70	1.28	39	1
1967	36.4	49	43.5	45	29.3	53	0.71	81	0
1966	41	4	47.2	7	34.5	5	0.77	74	1
1965	35.7	59	42.4	62	29.1	58	0.25	115	0
1964	31.9	92	37.8	98	26	90	2.75	3	0
1963	33.6	78	38.4	94	28.7	62	1.56	27	0
1962	39.6	9	44.7	26	34.5	5	1.09	53	0
1961	36.9	40	42.9	55	30.9	34	0.85	69	0
1960	31.8	93	35.9	112	27.7	75	0.79	72	0
1959	34.4	71	40.6	77	28.2	70	0.47	102	0
1958	37.4	32	42.7	59	32.1	22	1.81	15	0
1957	41	4	49.2	4	32.8	15	0.50	100	0
1956	37.8	25	43.9	40	31.7	25	0.76	76	0
1955	32.2	87	38.7	92	25.8	93	2.72	4	0
1954	36	55	42	68	30.1	45	0.52	99	0
1953	42.1	3	48.1	5	36.1	2	0.76	76	0
1952	37.5	29	42.3	63	32.8	15	1.63	25	0
1951	30.3	99	37	105	23.6	102	0.76	76	0
1950			45.7	15			1.48	33	13
1949	37.2	35	45.7	15	28.7	62	0.35	109	0
1948	30.5	98	37.2	103	23.8	101	1.16	46	0
1947	36.9	40	42.5	60	31.3	28	1.14	48	0
1946	37.1	37	44.5	31	29.6	49	0.25	115	1
1945	36.9	40	46	13	27.1	80	1.61	26	2
1944	32	90	36.6	108	27.1	80	0.80	71	1
1943	33.6	78	38.8	90	28.4	68	0.70	82	0
1942	36.6	45	42.8	57	30.3	43	1.87	12	0
1941	38.5	18	45.4	19	31.5	27	0.60	94	0
1940	35	63	42.2	65	27.8	73	1.81	15	0
1939	38.6	16	44.6	29	32.7	17	1.50	31	0
1938	37.8	25	45.4	19	30.4	41	0.37	108	1
1937	38.1	22	43.6	44	32.5	19	1.29	38	0
1936	37.1	37	44	37	29.7	48	1.13	50	1
1935	32.2	87	35.6	115	28.8	61			0
1934	39.1	11	44.1	36	34.1	7	0.72	80	1
1933			52.9	1	37.6	1	1.55	28	4
1932	32.5	84	41	74	23.6	102	0.49	101	1
1931	30	103	35.9	112	24.1	100	2.07	9	0
1930	33.8	77	38.4	94	29.2	55	0.53	98	0
1929	36.5	46	42.9	55	30.1	45	1.74	19	0
1928			39.3	86	26.7	86	0.94	62	4
1927	28.8	105	37.7	99	20.7	112	0.34	110	2
1926					25.2	97			5
1925	39.7	8	45.3	21	33.9	9	1.01	60	2
1924	25.7	114	32.7	120	18.4	119	1.19	45	1
1923			46.7	9	29.3	53	1.13	50	4
1922	26.4	112	33.6	119	18.3	120	1.71	21	1
1921	32.5	84	38.7	92	26.2	89	0.74	79	0
1920	37.4	32	46.1	12	28.5	65	1.25	42	2
1919	20.4	118	29.3	124	11.4	123			1
1918	37.7	28	44.8	24	30.7	36	0.62	92	0
1917	43.7	1	51.6	2	35.9	3	1.87	12	1
1916	29.1	104	36.1	111	22.2	106	1.54	29	0
1915	36.1	53	43.9	40	28.4	68	1.06	55	0
1914	25.7	114	32.5	121	18.8	116	0.62	92	1
1913	31.8	93	37.9	96	25.7	95			3
1912	34.2	72	47.1	8	21.2	111	0.29	112	1
1911	32.9	83	43.2	49	22.9	104	1.02	58	3
1910	38.9	13	45.6	18	32.3	21	0.68	86	0
1909	27.7	110	33.7	118	21.7	110			1
1908	35.5	61	44.3	33	26.8	84	0.25	115	0
1907	38.8	15	44.6	29	33	14	1.06	55	0
1906	36.4	49	41.8	69	30.6	37	1.78	17	2
1905	33.3	82	39	87	27.4	77			3
1899	37.9	23	46.6	10	29.2	55	1.02	58	0
1898	30.3	99	38.9	89	21.8	109	0.23	118	0
1897			41.3	72	25.8	93	1.21	43	4
1896	36.7	44	43	52	30.4	41	1.50	31	0
1894	34.5	70	42.2	65	26.8	84	0.55	97	0

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
1917	43.7
2025	43
1953	42.1
1966	41
1957	41
1974	39.8
1973	39.8
1925	39.7
1962	39.6
2002	39.3

Coldest
Year	Mean, °F
1919	20.4
1985	23
2022	25.7
1924	25.7
1914	25.7
2009	26.3
1922	26.4
2013	27.6
1909	27.7
2016	27.9
More years share the last value

Wettest
Year	Precipitation, in
1973	3.47
1996	3.20
1964	2.75
1955	2.72
1983	2.22
2024	2.16
2002	2.11
2005	2.08
1931	2.07
1995	1.96

Driest
Year	Precipitation, in
2011	0.13
2013	0.14
1898	0.23
1965	0.25
1946	0.25
1908	0.25
1999	0.28
1970	0.29
1912	0.29
1997	0.31

The hottest, coldest and wettest days

Hottest day: 69°F; 15 December 2025
Coldest night: 19°F; 31 December 2025
Wettest day: 0.38 in; 26 December 2025

Every month, season and year

Months

Seasons

Years

Tri-Cities, WA the day's answers

All-time records

Every answer in words

December 2025 brought 1.76 in of precipitation in Tri-Cities, WA, the wettest December since 2024, 18th wettest of 120.
The hottest day of December 2025 in Tri-Cities, WA: 69°F on Monday 15 December 2025.
The coldest night of December 2025 in Tri-Cities, WA: a low of 19°F on Wednesday 31 December 2025.
The wettest day of December 2025 in Tri-Cities, WA: 0.38 in on Friday 26 December 2025.