Lewistown Threshold Days by Year

18 fixed thresholds counted per year at Lewistown (USC00364992): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Lewistown Thresholds

Lewistown: days with 10 mm (0.39 in) or more of precipitation in 84 years, most in 2003 with 51.
Lewistown: days with 25 mm (0.98 in) or more of precipitation in 84 years, most in 1998 with 14.
Lewistown: days with a maximum temperature at or above 30 C (86 F) in 80 years, most in 2016 with 78.
Lewistown: days with a maximum temperature at or above 90 F (32.2 C) in 80 years, most in 1943 with 53.
18 fixed thresholds have at least one qualifying day at Lewistown.

Days at or above 30 C (86 F)

80 years with a qualifying day

Days per year at Lewistown with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 78 in 2016.

Days at or above 30 C (86 F) per year at Lewistown
Year	Days	Decade average
1939	75	75
1940	45	60.5
1941	72	60.5
1942	58	60.5
1943	77	60.5
1944	56	60.5
1946	49	60.5
1947	60	60.5
1949	67	60.5
1950	31	53.9
1951	58	53.9
1952	59	53.9
1953	59	53.9
1954	53	53.9
1955	67	53.9
1956	46	53.9
1957	60	53.9
1958	39	53.9
1959	67	53.9
1960	49	51.3
1961	55	51.3
1962	57	51.3
1963	45	51.3
1964	57	51.3
1965	55	51.3
1966	63	51.3
1967	29	51.3
1968	50	51.3
1969	53	51.3
1971	38	40.1
1973	44	40.1
1974	35	40.1
1975	31	40.1
1976	31	40.1
1977	57	40.1
1978	45	40.1
1981	25	39.9
1984	38	39.9
1985	47	39.9
1986	39	39.9
1987	47	39.9
1988	57	39.9
1989	26	39.9
1990	28	35.4
1991	63	35.4
1992	13	35.4
1993	44	35.4
1994	33	35.4
1995	45	35.4
1996	12	35.4
1997	29	35.4
1998	44	35.4
1999	43	35.4
2000	27	40.4
2001	47	40.4
2002	63	40.4
2003	28	40.4
2004	24	40.4
2005	61	40.4
2006	40	40.4
2007	51	40.4
2008	43	40.4
2009	20	40.4
2010	58	51.6
2011	50	51.6
2012	52	51.6
2013	47	51.6
2014	28	51.6
2015	54	51.6
2016	78	51.6
2017	43	51.6
2018	49	51.6
2019	57	51.6
2020	54	46.3
2021	49	46.3
2022	49	46.3
2023	40	46.3
2024	51	46.3
2025	46	46.3
2026	35	46.3

For each year, a bar from the first to the last day at Lewistown meeting 30 C (86 F).

First to last qualifying date each year at Lewistown
Year	First date	Last date
1939	1939-05-06	1939-10-10
1940	1940-05-13	1940-09-21
1941	1941-04-14	1941-10-08
1942	1942-05-13	1942-09-20
1943	1943-05-06	1943-09-06
1944	1944-05-04	1944-09-03
1946	1946-04-22	1946-10-06
1947	1947-05-19	1947-10-23
1949	1949-05-05	1949-10-13
1950	1950-05-06	1950-09-01
1951	1951-04-30	1951-10-06
1952	1952-04-23	1952-09-15
1953	1953-05-11	1953-10-01
1954	1954-04-21	1954-10-13
1955	1955-05-05	1955-09-19
1956	1956-04-29	1956-09-24
1957	1957-04-27	1957-09-23
1958	1958-05-19	1958-09-27
1959	1959-05-07	1959-10-07
1960	1960-04-24	1960-09-10
1961	1961-06-02	1961-09-26
1962	1962-04-27	1962-09-14
1963	1963-04-03	1963-10-28
1964	1964-04-18	1964-09-19
1965	1965-05-04	1965-09-24
1966	1966-06-05	1966-09-04
1967	1967-06-04	1967-09-20
1968	1968-06-06	1968-09-25
1969	1969-04-28	1969-09-18
1971	1971-05-18	1971-09-11
1973	1973-06-04	1973-09-05
1974	1974-04-28	1974-09-13
1975	1975-05-19	1975-07-31
1976	1976-04-17	1976-09-09
1977	1977-03-30	1977-09-18
1978	1978-05-20	1978-09-21
1981	1981-05-24	1981-09-15
1984	1984-05-22	1984-09-11
1985	1985-04-18	1985-09-21
1986	1986-03-30	1986-09-30
1987	1987-05-10	1987-08-21
1988	1988-05-29	1988-08-28
1989	1989-05-18	1989-09-11
1990	1990-04-25	1990-09-02
1991	1991-05-12	1991-09-17
1992	1992-05-02	1992-07-20
1993	1993-05-10	1993-09-15
1994	1994-04-25	1994-08-28
1995	1995-05-25	1995-09-08
1996	1996-05-19	1996-09-03
1997	1997-05-20	1997-09-03
1998	1998-03-30	1998-09-28
1999	1999-05-30	1999-09-03
2000	2000-05-06	2000-09-11
2001	2001-04-24	2001-09-14
2002	2002-04-17	2002-09-15
2003	2003-05-12	2003-08-30
2004	2004-04-19	2004-08-31
2005	2005-05-12	2005-09-23
2006	2006-05-29	2006-08-30
2007	2007-05-16	2007-10-10
2008	2008-05-31	2008-09-15
2009	2009-04-26	2009-08-27
2010	2010-04-07	2010-09-25
2011	2011-05-27	2011-09-05
2012	2012-04-17	2012-09-07
2013	2013-04-11	2013-10-07
2014	2014-05-09	2014-09-07
2015	2015-05-05	2015-09-20
2016	2016-05-26	2016-09-24
2017	2017-05-18	2017-09-28
2018	2018-04-14	2018-10-08
2019	2019-05-29	2019-10-03
2020	2020-05-16	2020-09-10
2021	2021-05-03	2021-09-19
2022	2022-05-22	2022-09-05
2023	2023-04-14	2023-09-08
2024	2024-04-30	2024-09-02
2025	2025-04-20	2025-09-29
2026	2026-04-16	2026-09-17

Every Fixed Threshold

Fixed thresholds at Lewistown
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	80	78	2016	35
35 C (95 F): Days	62	18	1953	4
40 C (104 F): Days	1	2	2011	2
90 F (32.2 C): Days	80	53	1943	12
100 F (37.8 C): Days	9	3	1953	1
0 C (32 F): Ice days (max	80	44	1978	23
0 C (32 F): Frost days (min	80	160	1981	78
-10 C (14 F): Days with min	80	44	1963	21
-20 C (-4 F): Days with min	26	6	1961	1
20 C (68 F): Tropical nights (min	78	34	2018	20
25 C (77 F): Days with min	5	1	1941	1
10 mm (0.39 in): Days with 10 mm or more rain	84	51	2003	35
25 mm (0.98 in): Days with 25 mm or more rain	84	14	1998	8
50 mm (1.97 in): Days with 50 mm or more rain	54	4	1967	4
100 mm (3.94 in): Days with 100 mm or more rain	3	1	2004	1
10 cm (3.9 in): Days with 10 cm or more snowfall	51	7	1994	1
25 cm (9.8 in): Days with 25 cm or more snowfall	12	2	1994	1
50 cm (19.7 in): Days with 50 cm or more snowfall	1	1	1993	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1939.

Download the Data

Data for Lewistown threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-15 (15 October 2026). Threshold counts are computed by this site.

Data as of 2026-10-15. Last revised 15 October 2026 (2026-10-15).

Lewistown Threshold Days by Year

Key Facts for Lewistown Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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