Flagstaff, AZ: December

31 December 2025: December 2025 averaged 39°F in Flagstaff, AZ, the warmest December since 1980, 2nd warmest of 128.

December 2025

Mean temperature: 39°F; Warmest since 1980; 2nd warmest of 128
Precipitation: 0.73 in; Driest since 2024; 40th driest of 128

A normal December in Flagstaff, AZ (1991 to 2020): a mean temperature of 30.1°F, between 26.3°F and 33.6°F in eight years of ten and 1.26 in of precipitation, between 0.19 in and 4.34 in in eight years of ten.

The mean temperature of every December in Flagstaff, AZ since 1898: 39°F in 2025; the highest is 39.8°F, in 1980.

Normal range, 26.3 to 33.6°F

Every year, ranked, as a table

Every December in Flagstaff, AZ from 1898 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	39	2	53.3	6	24.6	2	0.73	88	0
2024	36.7	5	53.9	3	19.5	34	0.00	127	0
2023	34.4	21	48.7	19	20.1	26	0.54	101	0
2022	31.9	44	43.5	60	20.4	25	2.33	40	0
2021	32.3	40	43.4	64	21.1	17	4.54	12	0
2020	29.8	69	44.1	49	15.5	71	0.36	109	0
2019	29.4	74	40.9	94	18	51	3.14	27	0
2018	30	67	43.5	60	16.6	63	0.95	79	0
2017	35.3	13	51.3	9	19.4	36	trace	124	0
2016	32.4	38	43.9	54	20.9	19	4.42	13	0
2015	27.9	89	41.6	84	14.2	85	1.03	76	0
2014	33.2	26	43.6	57	22.7	10	3.44	23	0
2013	27.5	92	40.7	96	14.3	83	1.35	66	0
2012	28.3	82	41.3	87	15.4	72	2.08	45	0
2011	26.2	104	39.2	105	13.3	99	2.16	42	0
2010	34.5	20	45.7	36	23.4	7	3.40	24	0
2009	24.5	117	37.2	115	11.7	112	2.85	31	0
2008	30.6	56	43.2	67	17.9	52	4.17	17	0
2007	26	105	39.5	103	12.5	106	4.33	14	0
2006	29.9	68	44.3	46	15.6	70	0.61	94	0
2005	32	43	47.9	21	16.2	65	0.01	122	0
2004	31.4	50	42.7	72	20.1	26	4.67	11	0
2003	30.1	65	42.9	69	17.4	57	0.92	81	0
2002	28.2	86	41.1	89	15.4	72	0.69	90	0
2001	27	98	41	90	12.9	103	1.16	70	0
2000	34.6	19	48.8	16	20.5	22	0.21	112	0
1999	29.3	75	44.2	47	14.3	83	trace	124	0
1998	31	54	43.7	56	18.4	46	0.42	105	0
1997	26.6	101	38.7	107	14.5	82	1.85	50	0
1996	33.5	24	45.9	34	21	18	0.64	92	0
1995	31.9	44	46.2	31	17.6	55	0.35	111	0
1994	32.1	41	43.3	65	20.8	20	1.43	61	0
1993	30.1	65	44.2	47	16	68	0.76	87	0
1992	26.3	102	39.5	103	13.1	101	6.78	2	0
1991	30.2	61	41.5	86	18.9	42	2.73	35	0
1990	25.1	111	40.1	99	10.1	122	1.68	56	0
1989	31.6	46	49.2	15	14	87	1.05	75	0
1988	27.9	89	42.1	79	13.7	92	1.00	77	0
1987	27.1	96	40.7	96	13.4	97	1.37	64	0
1986	30.2	61	43.6	57	16.8	62	1.43	61	0
1985	32.4	38	47	24	17.7	54	0.15	115	0
1984	29	79	39.6	102	18.3	48	5.00	9	0
1983	34	22	44.6	44	23.3	8	2.52	37	0
1982	28.1	87	41	90	15.2	76	3.67	22	0
1981	36.4	7	50.2	12	22.6	11	0.17	113	0
1980	39.8	1	52.8	8	26.9	1	1.15	71	0
1979	31.1	53	46.2	31	16.1	67	1.50	58	0
1978	24.3	118	37.7	113	10.9	120	5.39	7	0
1977	37.6	3	51.3	9	23.9	5	1.18	68	0
1976	31.6	46	49.4	14	13.8	89	0.80	86	0
1975	29.2	76	43.2	67	15.1	78	1.95	47	0
1974	26.8	99	41.3	87	12.3	110	1.18	68	0
1973	33	29	46.7	28	19.3	37	0.12	117	0
1972	21.9	127	34.2	127	9.6	123	4.13	18	0
1971	22.5	123	33.5	128	11.4	115	4.18	16	0
1970	28.5	81	42.4	74	14.6	81	2.12	43	0
1969	33.2	26	46.7	28	19.8	30	0.46	104	0
1968	25	112	38.7	107	11.2	116	2.71	36	0
1967	23.1	121	36	125	10.2	121	7.30	1	0
1966	29.7	71	42.3	76	17.1	59	6.17	4	0
1965	30.2	61	42.2	78	18.2	49	6.63	3	0
1964	30.3	60	41.7	83	18.8	43	2.74	34	0
1963	30.4	58	46.9	25	13.8	89	0.36	109	0
1962	31.5	48	46.9	25	16.2	65	0.85	84	0
1961	26	105	41	90	11	119	3.15	26	0
1960	28.7	80	42.1	79	15.2	76	0.39	107	0
1959	31.4	50	43.8	55	19	40	3.68	20	0
1958	36.5	6	53.7	4	19.3	37	trace	124	0
1957	35.1	14	48.8	16	21.4	16	0.59	97	0
1956	30.2	61	45.2	41	15.3	74	0.39	107	0
1955	33.8	23	47.1	23	20.5	22	0.88	83	0
1954	29.5	73	43.6	57	15.3	74	0.61	94	0
1953	28.3	82	42.3	76	14.2	85	0.53	102	0
1952	26.3	102	40.1	99	12.5	106	1.06	74	0
1951	26.7	100	38.5	109	14.8	80	5.45	6	0
1950	35.7	10	53.3	6	18.2	49	0.16	114	0
1949	27.1	96	41.8	81	12.4	109	1.49	60	0
1948	30.7	55	44	51	17.4	57	3.38	25	0
1947	28.1	87	42.5	73	13.7	92	2.02	46	0
1946	35.9	9	51.2	11	20.7	21	1.15	71	0
1945	28.3	82	42.9	69	13.6	94	2.27	41	0
1944	32.8	32	45.8	35	19.7	31	1.82	52	0
1943	29.1	77	39.2	105	19	40	2.38	39	0
1942	36.2	8	48.8	16	23.5	6	1.38	63	1
1941	30.4	58	42.4	74	18.4	46	2.11	44	0
1940	33.5	24	44.8	43	22.3	12	3.14	27	0
1939	37	4	53.5	5	20.5	22	0.03	121	0
1938	32.1	41	45.7	36	18.5	45	2.84	32	0
1937	34.7	18	45.2	41	24.2	4	1.91	48	0
1936	31.5	48	43.3	65	19.7	31	3.00	29	0
1935	31.2	52	44.5	45	17.8	53	0.56	99	0
1934	32.5	35	45.4	40	19.6	33	1.27	67	0
1933	34.9	15	49.8	13	20	28	0.62	93	0
1932	21.9	127	36.5	122	7.2	127	1.78	54	0
1931	22.8	122	36.9	118	8.8	124	2.39	38	0
1930	28.3	82	43.5	60	13.1	101	0.11	118	0
1929	35.5	12	54	1	17.1	59	0.01	122	0
1928	26	105	40.5	98	11.5	114	1.65	57	0
1927	25	112	37.1	117	12.9	103	1.85	50	0
1926	24.9	115	37.2	115	12.5	106	2.83	33	0
1925	32.8	32	44.1	49	21.5	15	0.59	97	0
1924	25	112	38.3	111	11.7	112	3.68	20	0
1923	29.1	77	38.4	110	19.9	29	3.89	19	0
1922	33	29	44	51	22.1	13	1.50	58	0
1921	34.8	17	46.7	28	22.9	9	4.32	15	0
1920	27.5	92	41.8	81	13.2	100	0.68	91	0
1919	29.6	72	42.8	71	16.4	64	0.73	88	0
1918	25.2	110	36.8	120	13.6	94	1.81	53	0
1917	34.9	15	54	1	15.8	69	0.00	127	0
1916	26	105	39.8	101	12.1	111	1.11	73	0
1915	27.4	94	41	90	13.8	89	5.03	8	0
1914	23.6	120	36.1	124	11.2	116	1.88	49	0
1913	26	105	36.9	118	15	79	0.90	82	0
1912	24.6	116	36.4	123	12.9	103	0.56	99	0
1911	22	126	37.8	112	6.2	128	0.61	94	0
1910	35.7	10	46.8	27	24.5	3	0.95	79	0
1909	22.1	125	35.5	126	8.7	125	2.98	30	0
1908	27.2	95	40.8	95	13.6	94	5.74	5	0
1907	32.5	35	45.6	38	19.3	37	0.47	103	0
1906	32.9	31	44	51	21.8	14	4.77	10	0
1905	22.2	124	36.6	121	7.8	126	0.81	85	0
1904	30.5	57	43.5	60	17.5	56	0.42	105	0
1903	29.8	69	46.2	31	13.4	97	0.10	119	0
1902	27.8	91	41.6	84	13.9	88	1.74	55	0
1901	32.8	32	48.6	20	17	61	0.14	116	0
1900	33.1	28	47.5	22	18.7	44	0.04	120	0
1899	32.5	35	45.5	39	19.5	34	0.99	78	0
1898	24.2	119	37.3	114	11.2	116	1.37	64	0

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
1980	39.8
2025	39
1977	37.6
1939	37
2024	36.7
1958	36.5
1981	36.4
1942	36.2
1946	35.9
1950	35.7
More years share the last value

Coldest
Year	Mean, °F
1972	21.9
1932	21.9
1911	22
1909	22.1
1905	22.2
1971	22.5
1931	22.8
1967	23.1
1914	23.6
1898	24.2

Wettest
Year	Precipitation, in
1967	7.30
1992	6.78
1965	6.63
1966	6.17
1908	5.74
1951	5.45
1978	5.39
1915	5.03
1984	5.00
1906	4.77

Driest
Year	Precipitation, in
2024	0.00
1917	0.00
2017	trace
1999	trace
1958	trace
2005	0.01
1929	0.01
1939	0.03
1900	0.04
1903	0.10

The hottest, coldest and wettest days

Hottest day: 68°F; 11 December 2025
Coldest night: 16°F; 5 December 2025, 2 December 2025
Wettest day: 0.35 in; 25 December 2025

Every month, season and year

Months

Seasons

Years

Flagstaff, AZ the day's answers

All-time records

Every answer in words

December 2025 brought 0.73 in of precipitation in Flagstaff, AZ, the driest December since 2024, tied 40th driest of 128 (with 1919).
The hottest day of December 2025 in Flagstaff, AZ: 68°F on Thursday 11 December 2025.
The coldest night of December 2025 in Flagstaff, AZ: a low of 16°F on Friday 5 December 2025 and Tuesday 2 December 2025.
The wettest day of December 2025 in Flagstaff, AZ: 0.35 in on Thursday 25 December 2025.