Great Falls, MT: May

31 May 2026: May 2026 averaged 54.7°F in Great Falls, MT, the warmest May since 2025, tied 41st warmest of 133 (with 1994 and 1952).

May 2026

Mean temperature: 54.7°F; Warmest since 2025; 41st warmest of 133
Precipitation: 3.43 in; Wettest since 2021; 24th wettest of 135

A normal May in Great Falls, MT (1991 to 2020): a mean temperature of 51.3°F, between 49.2°F and 55.3°F in eight years of ten and 2.43 in of precipitation, between 1.49 in and 3.43 in in eight years of ten.

The mean temperature of every May in Great Falls, MT since 1894: 54.7°F in 2026; the highest is 63°F, in 1936.

Normal range, 49.2 to 55.3°F

Every year, ranked, as a table

Every May in Great Falls, MT from 1892 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	54.7	41	69.1	30	40.3	70	3.43	24	0
2025	55.3	34	69.5	27	41.1	54	2.54	56	0
2024	49.7	115	62.5	99	37	128	2.22	65	0
2023	57.5	11	70.3	19	44.7	11	2.60	54	0
2022	50.2	109	63.2	90	37.2	125	1.24	105	0
2021	48.6	127	60.7	116	36.6	131	4.30	10	0
2020	51.3	87	64.5	75	38.2	112	3.34	28	0
2019	49.7	115	61.2	111	38.2	112	2.19	66	0
2018	57.6	10	69.4	29	45.8	5	3.52	21	0
2017	54.4	46	68.8	35	39.9	78	2.01	76	0
2016	51.2	92	63.7	82	38.7	106	2.04	75	0
2015	50.7	102	62.5	99	38.9	100	3.42	26	0
2014	51.7	82	65	69	38.5	109	1.62	89	0
2013	52.5	71	66	56	39	98	2.79	46	0
2012	50.6	104	64.3	79	36.9	130	2.27	62	0
2011	49.8	112	60.3	121	39.3	90	4.12	13	0
2010	47.5	132	59.1	131	35.8	133	2.75	48	0
2009	51.3	87	65.1	67	37.5	119	0.95	122	0
2008	52	78	63.4	85	40.5	63	3.82	16	0
2007	53.8	55	66.9	48	40.7	59	2.81	45	0
2006	54.3	47	68.9	33	39.7	80	2.64	51	0
2005	50.3	108	63.6	84	37	128	1.07	117	0
2004	48	130	60.1	123	35.8	133	2.91	41	0
2003	51.1	96	63	94	39.2	94	2.11	70	0
2002	49.8	112	62.3	102	37.3	121	1.61	90	0
2001	55.3	34	71.2	13	39.3	90	0.51	132	0
2000	53	65	66.8	50	39.3	90	2.10	72	0
1999	49.6	119	62.2	103	37.1	126	2.29	61	0
1998	54.1	51	68.8	35	39.3	90	3.08	37	0
1997	51.8	81	64.8	74	38.7	106	2.89	42	0
1996	46.8	133	57.8	132	35.8	133	2.57	55	0
1995	49.3	124	61.4	110	37.3	121	3.11	36	0
1994	54.7	41	67.4	43	42	43	1.81	80	0
1993	55.5	31	67.8	41	43.1	24	2.74	49	0
1992	55.3	34	69.9	23	40.6	60	2.14	68	0
1991	51.2	92	62.4	101	40	77	1.54	94	0
1990	49.8	112	61.9	107	37.7	118	3.97	14	0
1989	50.9	99	62.1	105	39.7	80	2.41	58	0
1988	56.4	25	70.6	16	42.2	41	1.60	91	0
1987	57.8	7	70.2	20	45.4	9	2.63	53	0
1986	53.2	62	65	69	41.4	48	1.74	83	0
1985	57.3	15	72.5	8	42.1	42	3.28	30	0
1984	51.7	82	64.4	76	39	98	1.34	101	0
1983	50.7	102	63.4	85	38	116	1.34	101	0
1982	48.4	129	59.5	128	37.3	121	3.63	19	0
1981	52.8	68	62.6	98	43	27	5.20	4	0
1980	57.1	17	69.8	24	44.3	14	5.12	6	0
1979	51.4	86	64	80	38.9	100	0.69	128	0
1978	51.3	87	62.1	105	40.4	65	3.20	33	0
1977	51.2	92	63.3	87	39.2	94	2.11	70	0
1976	56.9	20	70.9	14	42.9	30	0.88	125	0
1975	50	111	60.7	116	39.2	94	3.89	15	0
1974	49.4	123	60.3	121	38.6	108	3.16	34	0
1973	55.4	33	68.9	33	41.8	46	0.95	122	0
1972	53.5	60	65.6	61	41.4	48	1.59	92	0
1971	54.6	44	66.5	53	42.7	35	3.03	39	0
1970	53.8	55	65.3	65	42.3	39	3.16	34	0
1969	55.7	30	69.5	27	42	43	1.14	114	0
1968	49.5	121	61	115	38	116	2.64	51	0
1967	52.5	71	64.4	76	40.6	60	2.17	67	0
1966	55.8	28	69.1	30	42.4	38	1.54	94	0
1965	51.5	85	62.8	97	40.2	73	1.47	99	0
1964	54.8	39	65.7	60	43.8	18	3.36	27	0
1963	52.8	68	65.9	58	39.8	79	1.27	104	0
1962	50.8	100	61.1	114	40.5	63	5.18	5	0
1961	54.8	39	66.8	50	42.8	33	1.80	81	0
1960	52.2	75	63.3	87	41.2	52	1.71	86	0
1959	48.5	128	59.5	128	37.4	120	2.94	40	0
1958	61.8	3	75.4	5	48.3	1	1.09	116	0
1957	56.4	25	67.3	45	45.5	8	2.82	44	0
1956	54.3	47	65	69	43.6	20	1.33	103	0
1955	49.5	121	59.6	127	39.4	89	4.26	11	0
1954	53.5	60	65.1	67	41.9	45	1.17	110	0
1953	49.1	125	60	124	38.2	112	8.13	1	0
1952	54.7	41	65.5	62	44	15	1.57	93	0
1951	53.1	63	64.9	72	41.3	50	2.23	64	0
1950	50.8	100	61.2	111	40.4	65	0.67	131	0
1949	56.8	22	69	32	44.7	11	3.21	32	0
1948	53	65	63.1	92	43	27	3.43	24	0
1947	55.1	38	67	47	43.2	22	0.68	130	0
1946	51.1	96	61.9	107	40.2	73	1.70	87	0
1945	51.1	96	61.9	107	40.3	70	1.49	98	0
1944	57.1	17	68.7	37	45.6	7	1.15	113	0
1943	50.4	105	60.7	116	40.1	75	1.03	120	0
1942	50.4	105	60.6	120	40.1	75	4.64	8	0
1941	55.5	31	68.1	40	42.9	30	2.07	74	0
1940	57.4	13	71.6	11	43.1	24	2.10	72	0
1939	57.7	9	71.5	12	43.9	17	1.52	96	0
1938	52.1	77	62.9	96	41.3	50	3.72	17	0
1937	57.4	13	72.5	8	42.3	39	0.27	134	0
1936	63	1	79.2	1	46.9	2	1.18	109	0
1935	52.5	71	65.9	58	39.1	97	0.87	126	0
1934	62.1	2	77.6	2	46.5	3	1.06	119	0
1933	52.9	67	66.1	55	39.7	80	2.13	69	0
1932	56.8	22	70.7	15	42.8	33	1.19	108	0
1931	57	19	72.8	7	41.2	52	1.51	97	0
1930	54.3	47	67.6	42	41	57	1.63	88	0
1929	52.7	70	67.1	46	38.4	111	1.00	121	0
1928	59.8	5	76.4	4	43.2	22	1.11	115	0
1927	47.8	131	57	133	38.5	109	7.74	2	0
1926	56.9	20	70	21	43.8	18	1.37	100	0
1925	57.5	11	72.5	8	42.6	36	0.69	128	0
1924	55.2	37	70.4	18	40.3	70	1.07	117	1
1923	54.5	45	68.7	37	40.4	65	2.34	60	0
1922	53.6	58	66.9	48	40.4	65	3.05	38	0
1921	53.7	57	66.4	54	41.1	54	2.26	63	0
1920	52	78	65.3	65	38.8	104	1.22	106	0
1919	57.3	15	73.5	6	41.1	54	1.16	111	0
1918	51.2	92	66	56	36.4	132	0.86	127	0
1917	52.2	75	65.5	62	38.9	100	4.20	12	0
1916	49.7	115	62.2	103	37.1	126	3.67	18	0
1915	53.1	63	63.7	82	42.6	36	1.20	107	0
1914	55.8	28	70	21	41.5	47	3.55	20	0
1913	52.5	71	63.9	81	41	57	1.77	82	0
1912	53.9	54	64.9	72	43	27	2.39	59	0
1911	51.3	87	63	94	39.7	80	2.83	43	0
1910	56.5	24	69.8	24	43.1	24	1.84	78	0
1909	51.3	87	63.1	92	39.5	85	1.73	85	0
1908	54	53	64.4	76	43.5	21	4.62	9	0
1907	49.7	115	60.7	116	38.8	104	1.74	83	0
1906	50.1	110	59.8	125	40.4	65	5.03	7	0
1905	50.4	105	61.2	111	39.7	80	1.99	77	1
1904	54.2	50	65.5	62	42.9	30	1.16	111	0
1903	51.6	84	63.3	87	39.5	85	1.84	78	1
1902	56.2	27	67.4	43	45	10	5.93	3	0
1901	58.4	6	70.6	16	46.2	4	3.48	23	0
1900	57.8	7	69.7	26	45.8	5	2.73	50	0
1899	49.6	119	59.8	125	39.5	85	2.44	57	0
1898	53.6	58	63.2	90	44	15	3.22	31	0
1897	61	4	77.5	3	44.6	13	0.95	122	3
1896	48.9	126	59.5	128	38.2	112	3.29	29	1
1895	52	78	66.6	52	37.3	121	0.21	135	0
1894	54.1	51	68.7	37	39.5	85	2.76	47	0
1893					40.6	60	3.49	22	21
1892					38.9	100	0.29	133	22

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
1936	63
1934	62.1
1958	61.8
1897	61
1928	59.8
1901	58.4
1987	57.8
1900	57.8
1939	57.7
2018	57.6

Coldest
Year	Mean, °F
1996	46.8
2010	47.5
1927	47.8
2004	48
1982	48.4
1959	48.5
2021	48.6
1896	48.9
1953	49.1
1995	49.3

Wettest
Year	Precipitation, in
1953	8.13
1927	7.74
1902	5.93
1981	5.20
1962	5.18
1980	5.12
1906	5.03
1942	4.64
1908	4.62
2021	4.30

Driest
Year	Precipitation, in
1895	0.21
1937	0.27
1892	0.29
2001	0.51
1950	0.67
1947	0.68
1979	0.69
1925	0.69
1918	0.86
1935	0.87

The hottest, coldest and wettest days

Hottest day: 89°F; 13 May 2026
Coldest night: 23°F; 6 May 2026
Wettest day: 1.26 in; 30 May 2026

Every month, season and year

Months

Seasons

Years

Great Falls, MT the day's answers

All-time records

Every answer in words

May 2026 brought 3.43 in of precipitation in Great Falls, MT, the wettest May since 2021, tied 24th wettest of 135 (with 1948).
The hottest day of May 2026 in Great Falls, MT: 89°F on Wednesday 13 May 2026.
The coldest night of May 2026 in Great Falls, MT: a low of 23°F on Wednesday 6 May 2026.
The wettest day of May 2026 in Great Falls, MT: 1.26 in on Saturday 30 May 2026.