Hillsboro, OR: December

31 December 2025: December 2025 averaged 45.5°F in Hillsboro, OR (1 day missing), the warmest December since 1950 (1956 excluded: 6 of 31 days missing; 1958 excluded: 5 of 31 days missing), 2nd warmest of 93.

December 2025

Mean temperature: 45.5°F; Warmest since 1950; 2nd warmest of 93
Precipitation: 7.05 in; Wettest since 2023; 44th wettest of 96

A normal December in Hillsboro, OR (1991 to 2020): a mean temperature of 40.7°F, between 35.2°F and 41.8°F in eight years of ten and 5.94 in of precipitation, between 2.91 in and 9.17 in in eight years of ten.

The mean temperature of every December in Hillsboro, OR since 1929: 45.5°F in 2025; the highest is 46.4°F, in 1950.

Normal range, 35.2 to 41.8°F

Every year, ranked, as a table

Every December in Hillsboro, OR from 1929 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	45.5	2	51.5	2	39.5	3	7.05	44	1
2024	42.7	15	49.7	7	35.6	33	6.29	53	0
2023	43.9	6	50	6	37.7	9	7.68	33	0
2022	38.1	75	44.4	74	31.8	76	7.45	38	0
2021	38.3	71	43.7	80	33	61	6.82	47	0
2020	41.8	23	49.3	11	34.4	47	5.27	62	0
2019	41.5	27	47	36	36	25	5.22	63	0
2018	41.1	36	47.6	28	34.6	43	4.74	70	0
2017	37.9	76	45.4	63	30.4	82	2.92	85	0
2016	34.8	89	40.3	92	29.2	88	4.77	68	0
2015	41.7	24	46.4	51	37.1	15	14.60	2	0
2014	43.3	10	49.4	10	37.3	14	5.88	57	0
2013	33.7	92	39.9	93	27.5	93	1.08	96	0
2012	40.6	46	45.6	61	35.5	35	7.50	36	0
2011	36.9	82	44.3	76	29.4	87	2.33	93	0
2010	42.4	18	47.3	33	37.5	10	8.16	28	0
2009	34.7	90	42.8	85	26.6	94	3.96	73	1
2008	35.2	85	41.5	90	29	90	2.77	87	0
2007	38.9	63	44.4	74	33.3	55	8.94	19	0
2006	38.7	66	45.1	66	32.3	71	7.49	37	0
2005	38.8	65	44.9	69	32.7	66	9.09	18	0
2004	41.5	27	47.8	26	35.3	37	3.72	76	0
2003	41.2	34	46.4	51	36	25	7.93	30	0
2002	41.9	21	48.2	23	35.6	33	9.88	11	0
2001	40.5	47	46	59	35	38	6.98	45	0
2000	39.7	54	46.6	45	32.8	63	3.24	79	2
1999	41.4	29	48.4	21	34.5	45	3.91	74	0
1998	38.4	68	44.5	72	32.2	72	7.07	43	0
1997	41.2	34	46.6	45	35.8	28	3.34	78	0
1996	41.3	31	46.4	51	36.2	20	14.83	1	1
1995	41.6	26	47.3	33	36	25	7.82	31	0
1994	41.1	36	46.9	39	35.7	32	6.00	56	1
1993	39.8	53	46.5	48	33.1	59	7.54	35	0
1992	38.4	68	44	78	32.8	63	6.44	52	0
1991	40.7	43	46.5	48	35	38	4.76	69	1
1990	32.7	93	39.2	95	26.6	94	2.91	86	1
1989	39.2	60	45.2	65	33.2	58	2.94	84	0
1988	39.4	57	46.4	51	32.4	70	2.65	88	3
1987	37.8	78	43	83	32.5	68	9.33	16	0
1986	39.4	57	46.3	56	32.6	67	4.56	71	0
1985	33.8	91	42.5	86	25	96	2.37	92	0
1984	36.2	83	42.5	86	29.9	86	3.16	81	1
1983	35	88	39.5	94	30.4	82			0
1982	40.3	50	46.9	39	33.8	54	10.64	8	0
1981	42.6	17	48.6	19	36.5	18	10.00	10	0
1980	42.9	14	49.6	8	36.2	20	9.43	14	0
1979	44.1	4	50.7	3	37.5	10	6.18	54	0
1978	35.1	87	41.8	89	28.5	91	2.51	89	0
1977	43.1	12	48.2	23	38	8	8.89	22	0
1976	38.7	66	44.8	71	32.5	68	1.54	95	0
1975	42.7	15	48.5	20	36.9	16	6.49	51	0
1974	43.2	11	48.9	14	37.4	13	7.26	41	0
1973	44	5	49	12	38.9	5	9.68	12	0
1972	35.2	85	42.1	88	28.3	92	8.68	25	0
1971	39.2	60	44.1	77	34.3	49	8.93	20	0
1970	39.7	54	44.5	72	34.9	40	8.90	21	0
1969	41.9	21	47	36	36.9	16	8.76	23	0
1968	38.2	72	43.2	82	33.3	55	11.01	5	0
1967	41.3	31	46.8	42	35.8	28	4.88	67	0
1966	43.6	8	48.8	16	38.4	7	8.60	26	0
1965	37.5	79	43.8	79	31.3	79	7.14	42	0
1964	38.9	63	45	68	32.8	63	10.87	6	0
1963	40.4	48	48.9	14	31.8	76	4.05	72	0
1962	41.1	36	47.9	25	34.4	47	2.24	94	1
1961	40.9	40	46.2	57	35.8	28	6.54	50	2
1960	39.3	59	46.5	48	32	74	2.98	83	0
1959	38.2	72	44.9	69	31.9	75	3.88	75	1
1958			50.2	4	38.6	6	5.64	58	5
1957	43.4	9	49	12	37.5	10	7.63	34	1
1956			46.1	58	34.5	45	2.42	90	6
1955	39	62	45.1	66	32.9	62	10.13	9	0
1954	40.3	50	46.6	45	34	52	5.05	65	0
1953	42.3	19	48.4	21	36.2	20	6.16	55	2
1952	40.7	43	47.5	30	34.3	49	6.90	46	1
1951	37.5	79	43.3	81	31.6	78	6.70	48	0
1950	46.4	1	52.1	1	40.5	1	6.69	49	1
1949	40.4	48	46.8	42	34	52	5.40	61	0
1948	36.1	84	41.4	91	30.7	81	8.50	27	1
1947	40.9	40	47.5	30	34.2	51	5.16	64	1
1946	41.3	31	47.7	27	34.9	40	4.99	66	0
1945	39.9	52	46.7	44	33.1	59	7.35	40	0
1944	37.3	81	45.5	62	29.1	89	2.40	91	0
1943	38.2	72	46.4	51	30.2	84	3.05	82	1
1942	41.7	24	47.3	33	36.1	24	9.14	17	0
1941	40.9	40	46.9	39	34.9	40	10.72	7	0
1940	41.4	29	47	36	35.8	28	5.47	60	0
1939	43.8	7	48.7	18	39	4	9.61	13	1
1938	39.7	54	47.6	28	32.1	73	3.59	77	1
1937	42.2	20	48.8	16	35.5	35	13.33	4	0
1936	40.7	43	45.4	63	36.3	19	7.75	32	1
1935	38.4	68	45.9	60	30.9	80	5.63	59	1
1934	41	39	47.5	30	34.6	43	8.74	24	0
1933	45	3	50.2	4	39.6	2	13.95	3	3
1932					30.1	85	7.41	39	5
1931	37.9	76	43	83	33.3	55	9.41	15	2
1930							3.19	80	7
1929	43.1	12	49.5	9	36.2	20	8.16	28	1

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
1950	46.4
2025	45.5
1933	45
1979	44.1
1973	44
2023	43.9
1939	43.8
1966	43.6
1957	43.4
2014	43.3

Coldest
Year	Mean, °F
1990	32.7
2013	33.7
1985	33.8
2009	34.7
2016	34.8
1983	35
1978	35.1
2008	35.2
1972	35.2
1948	36.1

Wettest
Year	Precipitation, in
1996	14.83
2015	14.60
1933	13.95
1937	13.33
1968	11.01
1964	10.87
1941	10.72
1982	10.64
1955	10.13
1981	10.00

Driest
Year	Precipitation, in
2013	1.08
1976	1.54
1962	2.24
2011	2.33
1985	2.37
1944	2.40
1956	2.42
1978	2.51
1988	2.65
2008	2.77

The hottest, coldest and wettest days

Hottest day: 63°F; 15 December 2025
Coldest night: 26°F; 31 December 2025
Wettest day: 1.97 in; 18 December 2025

Every month, season and year

Months

Seasons

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2025

Hillsboro, OR the day's answers

All-time records

Every answer in words

December 2025 brought 7.05 in of precipitation in Hillsboro, OR, the wettest December since 2023, 44th wettest of 96.
The hottest day of December 2025 in Hillsboro, OR: 63°F on Monday 15 December 2025.
The coldest night of December 2025 in Hillsboro, OR: a low of 26°F on Wednesday 31 December 2025.
The wettest day of December 2025 in Hillsboro, OR: 1.97 in on Thursday 18 December 2025.