Casper, WY: Summer

31 August 2026: Summer 2026 averaged 70.1°F in Casper, WY, the warmest summer since 2012, tied 7th warmest of 87 (with 1940).

Summer 2026

Mean temperature: 70.1°F; Warmest since 2012; 7th warmest of 87
Precipitation: 2.69 in; Driest since 2025; 37th driest of 87

A normal summer in Casper, WY (1991 to 2020): a mean temperature of 67.8°F, between 65.9°F and 70.4°F in eight years of ten and 3.20 in of precipitation, between 1.86 in and 5.40 in in eight years of ten.

The mean temperature of every summer in Casper, WY since 1940: 70.1°F in 2026; the highest is 71.9°F, in 1988.

Normal range, 65.9 to 70.4°F

Every year, ranked, as a table

Every summer in Casper, WY from 1940 to 2026, 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
2026	70.1	7	88.2	5	52.1	25	2.69	51	0
2025	68.5	28	87.1	15	49.9	67	2.39	60	0
2024	68.8	22	88	8	49.7	75	1.72	75	0
2023	66.1	75	82	72	50.2	61	5.58	8	0
2022	68.6	26	87.2	13	49.9	67	2.51	54	0
2021	69.9	9	88.2	5	51.7	31	4.74	14	0
2020	69.1	15	88.1	7	50	64	0.37	87	0
2019	67	60	85.6	24	48.5	83	1.87	71	0
2018	67.8	38	85.8	23	49.8	70	3.58	29	0
2017	67.8	38	85.9	22	49.8	70	2.32	62	0
2016	68.3	33	87.2	13	49.4	77	2.71	50	0
2015	67.7	42	85.1	33	50.3	57	2.90	49	0
2014	66	76	83.4	57	48.7	82	3.62	28	0
2013	69.8	11	87.8	10	51.7	31	3.23	40	0
2012	71.3	2	89.7	2	52.9	17	1.49	81	0
2011	68.5	28	86.3	20	50.7	48	3.30	36	0
2010	66.9	63	83.3	60	50.4	54	3.79	26	0
2009	63.9	87	80.7	78	47.2	87	7.02	2	0
2008	66.5	70	84.6	39	48.3	84	1.95	70	0
2007	69.8	11	87.6	12	52.1	25	6.83	4	0
2006	71	4	88.9	3	53	16	2.95	47	0
2005	67	60	85.2	31	48.8	81	3.97	22	0
2004	64.3	86	81.2	76	47.4	86	3.56	31	0
2003	68.5	28	85.3	30	51.6	33	6.77	5	0
2002	68.5	28	87.1	15	50	64	2.11	67	0
2001	70.3	5	87.9	9	52.8	19	1.79	73	0
2000	68.8	22	87.8	10	49.8	70	2.03	68	0
1999	67.6	46	84.6	39	50.6	51	2.13	66	0
1998	66.3	72	82.2	71	50.4	54	5.25	9	0
1997	66.9	63	83.1	61	50.7	48	3.43	34	0
1996	67.4	51	86.6	17	48.2	85	2.41	55	0
1995	67.1	56	83.8	50	50.4	54	4.09	20	0
1994	71.1	3	88.5	4	53.7	9	3.73	27	0
1993	65	82	80.4	81	49.7	75	4.79	13	0
1992	66.5	70	81.8	74	51.2	39	3.16	42	0
1991	69.5	13	86	21	53.1	12	2.40	58	0
1990	67.7	42	84.4	42	50.9	44	4.70	15	0
1989	67.9	37	84.8	38	51.1	40	3.23	40	0
1988	71.9	1	89.8	1	54.1	4	0.99	83	0
1987	67.2	55	84.2	46	50.3	57	4.43	17	0
1986	68.6	26	84.9	35	52.3	22	5.21	10	0
1985	66.6	69	83.7	52	49.4	77	2.98	46	0
1984	67.8	38	84.5	41	51	42	3.85	24	0
1983	68.9	20	84.9	35	52.9	17	7.12	1	0
1982	68.3	33	84.4	42	52.2	23	6.95	3	0
1981	68.5	28	85.4	27	51.6	33	2.14	65	0
1980	67.7	42	85.5	26	49.9	67	1.60	78	0
1979	66.8	66	83.4	57	50.2	61	5.19	11	0
1978	66.7	67	82.6	67	50.8	47	4.95	12	0
1977	69	17	85	34	53.1	12	2.41	55	0
1976	67.3	53	82.9	63	51.8	30	3.04	45	0
1975	66.7	67	82.5	68	50.9	44	1.69	76	0
1974	67.3	53	83.5	54	51.1	40	2.35	61	0
1973	67.4	51	83.8	50	50.9	44	3.26	38	0
1972	66.3	72	82.8	64	49.8	70	3.39	35	0
1971	67.6	46	85.2	31	50	64	0.39	86	0
1970	68.7	24	85.6	24	51.9	29	2.92	48	0
1969	66.9	63	83.5	54	50.3	57	3.87	23	0
1968	64.8	83	80.6	79	49.1	80	3.49	32	0
1967	65.8	77	81.3	75	50.3	57	5.62	7	0
1966	67.8	38	84.9	35	50.6	51	2.61	52	0
1965	65.3	80	80.3	82	50.2	61	3.84	25	0
1964	67.1	56	82	72	52.2	23	1.79	73	0
1963	69.1	15	84.2	46	54.1	4	2.53	53	0
1962	65.7	78	80.3	82	51	42	3.24	39	0
1961	69.5	13	84.2	46	54.9	1	1.83	72	0
1960	67.5	49	83.5	54	51.4	36	1.56	79	0
1959	69	17	85.4	27	52.7	20	2.29	63	0
1958	67.1	56	82.5	68	51.6	33	3.28	37	0
1957	68.2	35	82.7	66	53.7	9	4.06	21	0
1956	68.7	24	84.3	45	53.1	12	1.56	79	0
1955	69	17	83.7	52	54.3	3	3.15	43	0
1954	70.2	6	86.4	19	53.9	6	1.29	82	0
1953	69.9	9	85.4	27	54.5	2	3.57	30	0
1952	68.9	20	84.4	42	53.3	11	2.25	64	0
1951	64.8	83	79.1	86	50.5	53	4.68	16	0
1950	64.6	85	79.9	85	49.4	77	2.40	58	0
1949	67	60	84.2	46	49.8	70	1.97	69	0
1948	67.7	42	82.4	70	53.1	12	3.46	33	1
1947	66.3	72	80.5	80	52.1	25	5.75	6	0
1946	67.6	46	83.1	61	52.1	25	3.06	44	0
1945	65.2	81	79	87	51.4	36	4.23	19	0
1944	65.4	79	80.2	84	50.7	48	2.41	55	0
1943	68	36	83.4	57	52.7	20	0.94	84	0
1942	67.1	56	82.8	64	51.4	36	0.78	85	0
1941	67.5	49	81.2	76	53.9	6	4.32	18	0
1940	70.1	7	86.5	18	53.8	8	1.62	77	0

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
1988	71.9
2012	71.3
1994	71.1
2006	71
2001	70.3
1954	70.2
2026	70.1
1940	70.1
2021	69.9
1953	69.9

Coldest
Year	Mean, °F
2009	63.9
2004	64.3
1950	64.6
1968	64.8
1951	64.8
1993	65
1945	65.2
1965	65.3
1944	65.4
1962	65.7

Wettest
Year	Precipitation, in
1983	7.12
2009	7.02
1982	6.95
2007	6.83
2003	6.77
1947	5.75
1967	5.62
2023	5.58
1998	5.25
1986	5.21

Driest
Year	Precipitation, in
2020	0.37
1971	0.39
1942	0.78
1943	0.94
1988	0.99
1954	1.29
2012	1.49
1960	1.56
1956	1.56
1980	1.60

The hottest, coldest and wettest days

Hottest day: 103°F; 2 August 2026, 12 July 2026
Coldest night: 30°F; 15 June 2026
Wettest day: 1.26 in; 13 August 2026

Every month, season and year

Months

Seasons

Years

Casper, WY the day's answers

All-time records

Every answer in words

Summer 2026 brought 2.69 in of precipitation in Casper, WY, the driest summer since 2025, 37th driest of 87.
The hottest day of summer 2026 in Casper, WY: 103°F on Sunday 2 August 2026 and Sunday 12 July 2026.
The coldest night of summer 2026 in Casper, WY: a low of 30°F on Monday 15 June 2026.
The wettest day of summer 2026 in Casper, WY: 1.26 in on Thursday 13 August 2026.