Casper, WY: December

31 December 2025: December 2025 averaged 36.9°F in Casper, WY, the warmest December on record, in 87 years since 1939; provisional.

December 2025

Mean temperature: 36.9°F; Warmest on record; Warmest of 87, provisional
Precipitation: 0.36 in; Driest since 2024; 25th driest of 87

A normal December in Casper, WY (1991 to 2020): a mean temperature of 25.7°F, between 20.3°F and 29.1°F in eight years of ten and 0.52 in of precipitation, between 0.13 in and 1.26 in in eight years of ten.

The mean temperature of every December in Casper, WY since 1939: 36.9°F in 2025, the highest of them all.

Normal range, 20.3 to 29.1°F

Every year, ranked, as a table

Every December in Casper, WY from 1939 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	36.9	1	48.1	1	25.6	1	0.36	60	0
2024	33.4	4	45.3	4	21.6	7	0.16	80	0
2023	32	6	42.6	5	21.5	8	0.06	86	0
2022	22.8	68	33.2	62	12.3	69	0.74	19	0
2021	30.1	12	41.7	9	18.5	30	0.63	29	0
2020	26.3	42	35.7	45	16.8	38	0.68	27	0
2019	26.7	38	33.8	59	19.6	19	0.60	33	0
2018	25.3	48	35.6	48	15	56	0.40	49	0
2017	22.5	70	33	65	12.1	71	1.37	2	0
2016	17.8	81	29.4	81	6.2	83	1.31	4	0
2015	24.8	53	33.2	62	16.4	43	1.06	8	0
2014	28.5	24	38.2	25	18.7	28	1.25	5	0
2013	20.3	78	30.3	77	10.4	75	1.20	6	0
2012	26.4	41	37.2	33	15.6	49	0.39	52	0
2011	24	61	33.1	64	14.9	57	0.71	24	0
2010	27	37	37.2	33	16.7	40	1.36	3	0
2009	15.6	85	26.4	85	4.9	84	0.97	11	0
2008	20.4	76	33.6	60	7.2	82	0.38	56	0
2007	20.9	75	29.5	80	12.3	69	0.74	19	0
2006	27.5	34	38.1	27	16.8	38	0.57	35	0
2005	24.6	56	34.8	55	14.5	59	0.29	72	0
2004	29.8	14	39.4	16	20.2	14	0.07	85	0
2003	29	19	38	29	20	18	0.39	52	0
2002	28.5	24	38.4	23	18.6	29	0.19	79	0
2001	25.3	48	35.4	51	15.1	52	0.13	82	0
2000	19.9	79	31.1	76	8.7	79	0.36	60	0
1999	29.9	13	39.7	14	20.1	16	0.10	83	0
1998	24.5	57	35.9	43	13	65	0.10	83	0
1997	22.8	68	31.5	73	14	60	0.53	38	0
1996	26	45	36	40	15.9	45	0.51	39	0
1995	28.3	28	40.1	13	16.6	41	0.34	65	0
1994	31.8	7	41.1	11	22.4	5	0.37	58	0
1993	28.9	22	37.7	30	20.1	16	0.68	27	0
1992	21.9	71	32	70	11.8	73	0.88	13	0
1991	27.9	32	37.2	33	18.5	30	0.34	65	0
1990	15.8	84	26.8	83	4.8	85	0.61	32	0
1989	25.4	47	35.7	45	13.7	62	0.31	69	1
1988	26.3	42	35.5	49	17.1	37	0.50	41	0
1987	23.7	64	34.8	55	12.7	66	0.63	29	0
1986	26.2	44	35.7	45	16.6	41	0.27	73	0
1985	21.3	73	30.2	78	12.4	68	1.05	9	0
1984	22.9	67	34.8	55	11	74	0.78	17	0
1983	10.9	87	22.1	87	-0.3	87	0.75	18	0
1982	23.3	66	31.4	74	15.1	52	3.71	1	0
1981	27.3	35	38.9	19	15.7	48	0.43	45	0
1980	34.3	2	46	2	22.6	4	0.37	58	0
1979	28.7	23	38.5	21	18.9	24	0.36	60	0
1978	13.2	86	23.8	86	2.5	86	1.20	6	0
1977	24.8	53	36.3	37	13.4	63	0.71	24	0
1976	28.3	28	38.4	23	18.1	33	0.38	56	0
1975	28.4	27	37.7	30	19.1	22	0.72	23	0
1974	24.3	60	32.7	68	15.9	45	0.22	78	0
1973	26.7	38	36	40	17.4	34	0.55	37	0
1972	17.7	82	26.5	84	8.8	78	0.41	48	0
1971	23.9	63	32.7	68	15.1	52	0.34	65	0
1970	25.2	51	35.2	52	15.2	50	0.89	12	0
1969	28.5	24	39.6	15	17.4	34	0.16	80	0
1968	18.8	80	29.6	79	8	80	0.71	24	0
1967	17.3	83	27.4	82	7.3	81	0.82	15	0
1966	25.3	48	35.5	49	15.1	52	0.57	35	0
1965	29	19	39	18	19.1	22	0.87	14	0
1964	23.4	65	33	65	13.8	61	0.47	43	0
1963	24.9	52	35.1	53	14.6	58	0.31	69	0
1962	30.4	10	41.2	10	19.5	20	0.23	76	0
1961	21.6	72	31.3	75	11.9	72	0.62	31	0
1960	25.5	46	35.9	43	15.2	50	0.47	43	0
1959	30.3	11	41.9	7	18.8	27	0.25	75	0
1958	29	19	39.1	17	18.9	24	0.23	76	0
1957	31.8	7	40.8	12	22.8	3	0.43	45	0
1956	28.3	28	37.4	32	19.3	21	0.59	34	0
1955	27.2	36	37.1	36	17.3	36	1.04	10	0
1954	29.8	14	38.2	25	21.4	9	0.32	68	0
1953	24.7	55	33.6	60	15.8	47	0.74	19	0
1952	28.2	31	36.3	37	20.2	14	0.03	87	0
1951	20.4	76	31.8	71	8.9	77	0.42	47	0
1950	31.1	9	41.9	7	20.4	12	0.26	74	0
1949	24.4	59	36	40	12.7	66	0.48	42	0
1948	21.1	74	31.8	71	10.3	76	0.39	52	0
1947	26.5	40	34.8	55	18.3	32	0.39	52	0
1946	33.1	5	42.1	6	24	2	0.40	49	0
1945	24.5	57	32.9	67	16.1	44	0.79	16	0
1944	24	61	35	54	13.1	64	0.30	71	0
1943	27.6	33	36.3	37	18.9	24	0.51	39	0
1942	29.6	17	38.7	20	20.5	11	0.35	64	0
1941	29.2	18	38.1	27	20.4	12	0.73	22	0
1940	29.8	14	38.5	21	21.2	10	0.36	60	0
1939	33.8	3	45.5	3	22	6	0.40	49	0

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
2025	36.9
1980	34.3
1939	33.8
2024	33.4
1946	33.1
2023	32
1994	31.8
1957	31.8
1950	31.1
1962	30.4

Coldest
Year	Mean, °F
1983	10.9
1978	13.2
2009	15.6
1990	15.8
1967	17.3
1972	17.7
2016	17.8
1968	18.8
2000	19.9
2013	20.3

Wettest
Year	Precipitation, in
1982	3.71
2017	1.37
2010	1.36
2016	1.31
2014	1.25
2013	1.20
1978	1.20
2015	1.06
1985	1.05
1955	1.04

Driest
Year	Precipitation, in
1952	0.03
2023	0.06
2004	0.07
1999	0.10
1998	0.10
2001	0.13
2024	0.16
1969	0.16
2002	0.19
1974	0.22

The hottest, coldest and wettest days

Hottest day: 63°F; 24 December 2025, 23 December 2025
Coldest night: -10°F; 28 December 2025
Wettest day: 0.13 in; 27 December 2025

Every month, season and year

Months

Seasons

Years

Casper, WY the day's answers

All-time records

Every answer in words

December 2025 brought 0.36 in of precipitation in Casper, WY, the driest December since 2024, tied 25th driest of 87 (with 2000, 1979 and 1940).
The hottest day of December 2025 in Casper, WY: 63°F on Wednesday 24 December 2025 and Tuesday 23 December 2025.
The coldest night of December 2025 in Casper, WY: a low of -10°F on Sunday 28 December 2025.
The wettest day of December 2025 in Casper, WY: 0.13 in on Saturday 27 December 2025.