Casper, WY: May

31 May 2026: May 2026 averaged 53°F in Casper, WY, the warmest May since 2025, tied 40th warmest of 87 (with 2025, 2020 and 1951).

May 2026

Mean temperature: 53°F; Warmest since 2025; 40th warmest of 87
Precipitation: 1.67 in; Driest since 2025; 39th driest of 87

A normal May in Casper, WY (1991 to 2020): a mean temperature of 52.8°F, between 48.2°F and 55.7°F in eight years of ten and 2.15 in of precipitation, between 0.48 in and 3.93 in in eight years of ten.

The mean temperature of every May in Casper, WY since 1940: 53°F in 2026; the highest is 61°F, in 1994.

Normal range, 48.2 to 55.7°F

Every year, ranked, as a table

Every May 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
2026	53	40	69.2	27	36.9	59	1.67	49
2025	53	40	67.8	36	38.3	39	1.28	61
2024	49.8	67	64.6	58	35	78	2.44	32
2023	55.2	13	70.3	13	40.1	21	2.03	39
2022	48.3	79	63.4	65	33.2	86	2.61	29
2021	51.3	54	66.7	43	35.9	73	0.60	80
2020	53	40	69.8	17	36.3	64	0.30	86
2019	46.1	87	58.7	85	33.5	85	3.62	12
2018	55.7	9	70.8	10	40.5	17	2.86	19
2017	52	48	66.4	47	37.6	47	2.25	34
2016	49.8	67	63.4	65	36.1	69	3.01	17
2015	49.1	74	61.1	77	37.2	56	3.89	7
2014	52.8	46	68.4	34	37.3	55	0.49	83
2013	54.2	26	69.5	21	39	30	1.81	46
2012	53.9	30	70.4	12	37.4	51	1.75	48
2011	47.6	83	59.7	83	35.4	77	3.37	14
2010	46.5	85	60.3	81	32.6	87	2.48	31
2009	52.9	44	69.1	28	36.7	60	0.43	84
2008	49.7	70	63.4	65	36	71	4.26	5
2007	54.2	26	69.9	16	38.5	36	2.86	19
2006	54.4	21	71.4	6	37.4	51	0.94	69
2005	50.7	60	65.8	55	35.5	76	2.63	28
2004	53.3	35	69	30	37.5	49	1.07	66
2003	53.3	35	69.5	21	37.1	57	0.51	82
2002	50.2	64	66.1	51	34.4	82	1.15	63
2001	54.9	16	71.3	8	38.4	37	0.63	78
2000	54.9	16	69.7	19	40.1	21	3.32	16
1999	49.9	66	63.8	63	36	71	2.29	33
1998	54.4	21	70.7	11	38.1	41	0.73	74
1997	51.6	50	67.2	42	35.9	73	1.99	41
1996	50.3	63	64	61	36.6	61	1.29	60
1995	48.3	79	59.1	84	37.6	47	6.31	2
1994	61	1	78	1	44	2	0.37	85
1993	56.1	5	69.3	24	43	4	2.85	21
1992	56.2	4	71.7	5	40.6	14	2.05	38
1991	51.8	49	64.1	60	39.5	26	4.75	4
1990	50.5	62	66	53	35	78	1.09	65
1989	53.9	30	69.3	24	38.6	35	2.77	24
1988	54.1	28	69.6	20	38.7	33	1.24	62
1987	57.4	3	71.4	6	43.5	3	1.40	53
1986	50.9	59	66.7	43	35	78	1.33	57
1985	55.3	11	71	9	39.6	25	1.37	55
1984	54.5	20	70.3	13	38.7	33	1.33	57
1983	48.4	78	62	72	34.7	81	1.40	53
1982	51.1	56	64.4	59	37.8	45	2.10	37
1981	51.3	54	63.4	65	39.3	27	3.51	13
1980	51.6	50	65.6	56	37.5	49	2.82	22
1979	49.3	72	62.7	70	35.8	75	2.25	34
1978	49.6	71	61.1	77	38	43	6.46	1
1977	55.1	14	69.8	17	40.4	19	1.93	45
1976	53.6	33	68.3	35	38.9	31	2.69	26
1975	48.8	76	61.4	75	36.3	64	3.88	8
1974	51.4	53	66.3	49	36.5	63	0.62	79
1973	51.1	56	65.9	54	36.3	64	1.02	68
1972	52.1	47	66.1	51	38.1	41	0.76	73
1971	50.1	65	63.5	64	36.6	61	5.59	3
1970	53.3	35	67.5	38	39.1	29	2.03	39
1969	55.3	11	71.8	4	38.9	31	0.85	70
1968	48	82	61.7	73	34.4	82	3.35	15
1967	49.1	74	61.1	77	37.1	57	1.62	50
1966	55.8	8	74.1	2	37.4	51	0.30	86
1965	49.8	67	61.7	73	38	43	2.64	27
1964	54.1	28	67.6	37	40.6	14	2.17	36
1963	55.1	14	69.3	24	41	11	0.80	71
1962	54.4	21	67.5	38	41.4	8	3.80	10
1961	54.4	21	67.3	41	41.4	8	0.71	76
1960	53.5	34	68.7	32	38.4	37	0.56	81
1959	50.6	61	63.4	65	37.7	46	1.99	41
1958	59	2	73.5	3	44.5	1	0.78	72
1957	51.5	52	62.2	71	40.9	12	3.85	9
1956	55.9	7	68.8	31	43	4	1.97	43
1955	54.8	18	69.1	28	40.5	17	0.73	74
1954	53.2	39	66.7	43	39.7	24	0.70	77
1953	48.6	77	61.1	77	36.1	69	1.60	51
1952	53.7	32	66.2	50	41.2	10	3.93	6
1951	53	40	65.3	57	40.6	14	1.45	52
1950	46.2	86	58.6	86	33.8	84	1.97	43
1949	53.3	35	66.5	46	40.1	21	2.53	30
1948	54.4	21	68.5	33	40.3	20	1.30	59
1947	52.9	44	66.4	47	39.3	27	2.97	18
1946	47.2	84	58.1	87	36.2	68	3.73	11
1945	51.1	56	63.9	62	38.3	39	1.07	66
1944	54.6	19	67.4	40	41.9	7	2.78	23
1943	48.2	81	60.1	82	36.3	64	1.79	47
1942	49.3	72	61.3	76	37.4	51	2.74	25
1941	56	6	69.4	23	42.5	6	1.35	56
1940	55.5	10	70.1	15	40.8	13	1.11	64

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
1994	61
1958	59
1987	57.4
1992	56.2
1993	56.1
1941	56
1956	55.9
1966	55.8
2018	55.7
1940	55.5

Coldest
Year	Mean, °F
2019	46.1
1950	46.2
2010	46.5
1946	47.2
2011	47.6
1968	48
1943	48.2
2022	48.3
1995	48.3
1983	48.4

Wettest
Year	Precipitation, in
1978	6.46
1995	6.31
1971	5.59
1991	4.75
2008	4.26
1952	3.93
2015	3.89
1975	3.88
1957	3.85
1962	3.80

Driest
Year	Precipitation, in
2020	0.30
1966	0.30
1994	0.37
2009	0.43
2014	0.49
2003	0.51
1960	0.56
2021	0.60
1974	0.62
2001	0.63

The hottest, coldest and wettest days

Hottest day: 92°F; 13 May 2026
Coldest night: 18°F; 6 May 2026
Wettest day: 0.62 in; 18 May 2026

Every month, season and year

Months

Seasons

Years

Casper, WY the day's answers

All-time records

Every answer in words

May 2026 brought 1.67 in of precipitation in Casper, WY, the driest May since 2025, 39th driest of 87.
The hottest day of May 2026 in Casper, WY: 92°F on Wednesday 13 May 2026.
The coldest night of May 2026 in Casper, WY: a low of 18°F on Wednesday 6 May 2026.
The wettest day of May 2026 in Casper, WY: 0.62 in on Monday 18 May 2026.