Westby Threshold Days by Year (USC00248777)

19 fixed thresholds counted per year at Westby (USC00248777): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Westby Thresholds

Westby: days with 10 mm (0.39 in) or more of precipitation in 72 years, most in 1953 with 20.
Westby: days with a maximum temperature at or above 30 C (86 F) in 70 years, most in 1961 with 64.
Westby: days with a maximum temperature at or above 90 F (32.2 C) in 70 years, most in 1961 with 49.
Westby: days with a maximum temperature at or below 0 C (32 F) in 70 years, most in 1951 with 125.
19 fixed thresholds have at least one qualifying day at Westby.

Days at or above 30 C (86 F)

70 years with a qualifying day

Days per year at Westby with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 64 in 1961.

Days at or above 30 C (86 F) per year at Westby
Year	Days	Decade average
1937	60	46.7
1938	33	46.7
1939	47	46.7
1940	43	33.4
1941	36	33.4
1942	26	33.4
1943	31	33.4
1944	18	33.4
1945	33	33.4
1947	32	33.4
1948	35	33.4
1949	47	33.4
1950	23	23.2
1951	23	23.2
1952	24	23.2
1953	23	23.2
1954	23	23.2
1960	43	37.7
1961	64	37.7
1962	24	37.7
1963	35	37.7
1964	38	37.7
1965	23	37.7
1966	38	37.7
1967	49	37.7
1968	25	37.7
1969	38	37.7
1970	51	35.3
1971	38	35.3
1972	25	35.3
1973	39	35.3
1974	36	35.3
1975	29	35.3
1976	31	35.3
1977	34	35.3
1978	35	35.3
1979	35	35.3
1980	41	41.8
1981	41	41.8
1982	33	41.8
1983	51	41.8
1988	46	41.8
1989	39	41.8
1990	25	18.5
1991	23	18.5
1992	17	18.5
1993	5	18.5
1994	14	18.5
1995	17	18.5
1996	19	18.5
1997	26	18.5
1998	22	18.5
1999	17	18.5
2000	19	25.9
2001	27	25.9
2002	22	25.9
2003	41	25.9
2005	27	25.9
2007	33	25.9
2008	20	25.9
2009	18	25.9
2010	21	20
2011	17	20
2016	22	20
2020	30	28.2
2021	36	28.2
2023	32	28.2
2024	31	28.2
2025	14	28.2
2026	26	28.2

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

First to last qualifying date each year at Westby
Year	First date	Last date
1937	1937-05-28	1937-09-19
1938	1938-06-17	1938-09-25
1939	1939-04-29	1939-09-21
1940	1940-05-11	1940-09-16
1941	1941-05-24	1941-09-18
1942	1942-04-22	1942-10-10
1943	1943-07-03	1943-10-04
1944	1944-05-29	1944-09-07
1945	1945-06-21	1945-09-06
1947	1947-07-02	1947-09-04
1948	1948-05-18	1948-09-15
1949	1949-04-28	1949-09-24
1950	1950-06-04	1950-09-06
1951	1951-05-23	1951-08-22
1952	1952-04-26	1952-09-26
1953	1953-06-11	1953-10-01
1954	1954-06-23	1954-08-31
1960	1960-05-12	1960-09-04
1961	1961-05-27	1961-08-31
1962	1962-04-24	1962-09-06
1963	1963-05-30	1963-09-30
1964	1964-05-17	1964-09-17
1965	1965-07-03	1965-08-23
1966	1966-05-26	1966-09-20
1967	1967-06-27	1967-09-29
1968	1968-04-30	1968-09-11
1969	1969-05-26	1969-09-13
1970	1970-05-17	1970-09-18
1971	1971-06-03	1971-09-12
1972	1972-05-16	1972-09-09
1973	1973-05-31	1973-08-30
1974	1974-06-13	1974-08-07
1975	1975-06-24	1975-09-16
1976	1976-06-02	1976-09-18
1977	1977-04-26	1977-08-25
1978	1978-05-24	1978-09-10
1979	1979-06-11	1979-09-16
1980	1980-04-20	1980-09-07
1981	1981-05-20	1981-09-20
1982	1982-06-22	1982-09-10
1983	1983-05-26	1983-09-26
1988	1988-05-17	1988-09-06
1989	1989-04-22	1989-09-30
1990	1990-06-10	1990-09-13
1991	1991-06-12	1991-09-02
1992	1992-05-07	1992-10-01
1993	1993-05-13	1993-08-10
1994	1994-07-10	1994-09-09
1995	1995-05-31	1995-09-03
1996	1996-06-09	1996-09-01
1997	1997-06-01	1997-10-03
1998	1998-07-11	1998-09-17
1999	1999-05-29	1999-08-31
2000	2000-05-03	2000-09-18
2001	2001-04-29	2001-09-29
2002	2002-06-27	2002-09-17
2003	2003-05-30	2003-09-09
2005	2005-06-18	2005-09-11
2007	2007-06-12	2007-09-17
2008	2008-07-01	2008-08-31
2009	2009-06-21	2009-09-25
2010	2010-06-26	2010-09-28
2011	2011-06-30	2011-09-27
2016	2016-05-06	2016-09-03
2020	2020-05-31	2020-09-06
2021	2021-05-19	2021-10-07
2023	2023-05-23	2023-09-17
2024	2024-07-10	2024-09-30
2025	2025-05-05	2025-09-02
2026	2026-05-26	2026-09-05

Every Fixed Threshold

Fixed thresholds at Westby
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	70	64	1961	26
35 C (95 F): Days	64	25	1961	4
40 C (104 F): Days	11	4	1983	1
90 F (32.2 C): Days	70	49	1961	17
100 F (37.8 C): Days	37	10	1983	2
110 F (43.3 C): Days	1	1	1937	1
0 C (32 F): Ice days (max	70	125	1951	44
0 C (32 F): Frost days (min	65	227	2002	118
-10 C (14 F): Days with min	65	128	1951	47
-20 C (-4 F): Days with min	65	74	1951	14
-30 C (-22 F): Days with min	65	27	1996	4
-40 C (-40 F): Days with min	10	6	1943	1
20 C (68 F): Tropical nights (min	27	3	1937	1
10 mm (0.39 in): Days with 10 mm or more rain	72	20	1953	7
25 mm (0.98 in): Days with 25 mm or more rain	62	6	1953	2
50 mm (1.97 in): Days with 50 mm or more rain	11	2	1965	1
100 mm (3.94 in): Days with 100 mm or more rain	1	1	1990	1
10 cm (3.9 in): Days with 10 cm or more snowfall	48	6	1948	1
25 cm (9.8 in): Days with 25 cm or more snowfall	7	2	1943	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1937.

Download the Data

Data for Westby 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 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

Data as of 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Westby Threshold Days by Year (USC00248777)

Key Facts for Westby Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

Related