Louisa Threshold Days by Year (USC00445050)

18 fixed thresholds counted per year at Louisa (USC00445050): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Louisa Thresholds

Louisa: nights with a minimum temperature at or below 0 C (32 F) in 107 years, most in 1924 with 136.
Louisa: nights with a minimum temperature at or below -10 C (14 F) in 107 years, most in 2000 with 28.
Louisa: nights with a minimum temperature at or above 20 C (68 F) in 107 years, most in 1943 with 52.
Louisa: days with a maximum temperature at or above 30 C (86 F) in 103 years, most in 2010 with 114.
18 fixed thresholds have at least one qualifying day at Louisa.

Days at or above 30 C (86 F)

103 years with a qualifying day

Days per year at Louisa with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 114 in 2010.

Days at or above 30 C (86 F) per year at Louisa
Year	Days	Decade average
1918	41	41
1921	74	57.1
1923	42	57.1
1924	37	57.1
1925	78	57.1
1926	54	57.1
1927	47	57.1
1929	68	57.1
1930	88	68.8
1931	76	68.8
1932	78	68.8
1933	61	68.8
1935	46	68.8
1936	75	68.8
1937	57	68.8
1938	64	68.8
1939	74	68.8
1941	95	72.1
1942	81	72.1
1943	91	72.1
1944	81	72.1
1945	69	72.1
1946	45	72.1
1947	69	72.1
1948	52	72.1
1949	66	72.1
1950	52	74.3
1951	73	74.3
1952	77	74.3
1953	90	74.3
1954	97	74.3
1955	63	74.3
1956	69	74.3
1957	84	74.3
1958	56	74.3
1959	82	74.3
1960	70	61.6
1961	64	61.6
1962	55	61.6
1963	69	61.6
1964	70	61.6
1965	68	61.6
1966	72	61.6
1967	43	61.6
1968	54	61.6
1969	51	61.6
1970	77	54
1971	69	54
1972	39	54
1973	67	54
1974	41	54
1975	45	54
1976	53	54
1977	76	54
1978	43	54
1979	30	54
1980	69	63.9
1981	44	63.9
1982	27	63.9
1983	86	63.9
1984	60	63.9
1985	66	63.9
1986	76	63.9
1987	80	63.9
1988	74	63.9
1989	57	63.9
1990	72	68.8
1991	88	68.8
1992	47	68.8
1993	75	68.8
1994	61	68.8
1995	72	68.8
1996	53	68.8
1997	59	68.8
1998	91	68.8
1999	70	68.8
2000	42	69.7
2001	57	69.7
2002	89	69.7
2003	54	69.7
2004	62	69.7
2005	83	69.7
2006	68	69.7
2007	84	69.7
2008	82	69.7
2009	76	69.7
2010	114	76.2
2011	93	76.2
2012	77	76.2
2013	65	76.2
2014	53	76.2
2015	54	76.2
2016	80	76.2
2017	66	76.2
2018	75	76.2
2019	85	76.2
2020	65	72
2021	70	72
2022	63	72
2023	58	72
2024	73	72
2025	68	72
2026	107	72

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

First to last qualifying date each year at Louisa
Year	First date	Last date
1918	1918-05-05	1918-09-07
1921	1921-03-21	1921-09-28
1923	1923-06-03	1923-09-20
1924	1924-05-07	1924-09-02
1925	1925-04-23	1925-09-28
1926	1926-06-13	1926-10-04
1927	1927-04-20	1927-10-02
1929	1929-03-24	1929-09-29
1930	1930-04-11	1930-09-26
1931	1931-05-29	1931-10-08
1932	1932-05-07	1932-09-23
1933	1933-05-13	1933-10-01
1935	1935-04-27	1935-09-21
1936	1936-04-30	1936-09-28
1937	1937-04-18	1937-09-05
1938	1938-03-22	1938-10-19
1939	1939-04-25	1939-10-10
1941	1941-04-14	1941-10-15
1942	1942-04-05	1942-09-20
1943	1943-04-28	1943-09-16
1944	1944-05-02	1944-10-07
1945	1945-03-16	1945-09-29
1946	1946-04-23	1946-09-22
1947	1947-05-01	1947-10-23
1948	1948-03-21	1948-09-20
1949	1949-04-26	1949-09-19
1950	1950-05-05	1950-09-04
1951	1951-04-26	1951-10-06
1952	1952-03-21	1952-10-02
1953	1953-04-25	1953-10-20
1954	1954-04-19	1954-10-13
1955	1955-05-04	1955-09-20
1956	1956-04-04	1956-09-23
1957	1957-04-20	1957-09-22
1958	1958-04-19	1958-10-10
1959	1959-04-08	1959-10-06
1960	1960-04-14	1960-09-10
1961	1961-04-25	1961-09-25
1962	1962-04-22	1962-10-12
1963	1963-04-02	1963-09-20
1964	1964-04-17	1964-09-23
1965	1965-05-03	1965-09-23
1966	1966-04-24	1966-09-11
1967	1967-04-02	1967-10-05
1968	1968-05-03	1968-09-25
1969	1969-04-27	1969-09-17
1970	1970-05-09	1970-10-03
1971	1971-04-13	1971-09-17
1972	1972-06-04	1972-09-26
1973	1973-04-22	1973-09-29
1974	1974-04-28	1974-11-01
1975	1975-05-20	1975-10-14
1976	1976-04-16	1976-09-14
1977	1977-04-11	1977-09-25
1978	1978-05-20	1978-09-20
1979	1979-06-09	1979-09-06
1980	1980-05-12	1980-09-23
1981	1981-04-28	1981-09-14
1982	1982-05-07	1982-09-18
1983	1983-04-28	1983-10-04
1984	1984-04-27	1984-09-25
1985	1985-03-29	1985-10-15
1986	1986-03-31	1986-10-04
1987	1987-05-10	1987-09-17
1988	1988-05-16	1988-09-24
1989	1989-03-28	1989-10-15
1990	1990-03-12	1990-10-09
1991	1991-04-07	1991-09-19
1992	1992-04-17	1992-09-22
1993	1993-05-11	1993-09-15
1994	1994-04-19	1994-09-17
1995	1995-04-19	1995-10-06
1996	1996-04-12	1996-09-10
1997	1997-05-18	1997-10-10
1998	1998-03-29	1998-10-01
1999	1999-04-08	1999-09-09
2000	2000-05-06	2000-09-04
2001	2001-04-09	2001-09-13
2002	2002-04-15	2002-10-05
2003	2003-04-16	2003-09-20
2004	2004-04-18	2004-09-22
2005	2005-04-20	2005-09-23
2006	2006-05-28	2006-08-30
2007	2007-04-25	2007-10-09
2008	2008-04-18	2008-10-14
2009	2009-04-25	2009-09-25
2010	2010-04-05	2010-10-12
2011	2011-04-04	2011-09-14
2012	2012-04-15	2012-09-08
2013	2013-04-09	2013-10-06
2014	2014-05-08	2014-09-21
2015	2015-05-18	2015-09-09
2016	2016-04-18	2016-10-19
2017	2017-04-29	2017-09-28
2018	2018-05-02	2018-10-07
2019	2019-05-18	2019-10-04
2020	2020-06-03	2020-09-10
2021	2021-04-28	2021-09-15
2022	2022-04-24	2022-09-20
2023	2023-04-20	2023-10-29
2024	2024-04-15	2024-08-30
2025	2025-04-05	2025-09-19
2026	2026-03-11	2026-10-14

Every Fixed Threshold

Fixed thresholds at Louisa
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	103	114	2010	107
35 C (95 F): Days	88	33	1930	14
40 C (104 F): Days	5	5	1930	1
90 F (32.2 C): Days	103	82	2010	54
100 F (37.8 C): Days	26	14	1930	3
0 C (32 F): Ice days (max	91	16	1918	7
0 C (32 F): Frost days (min	107	136	1924	53
-10 C (14 F): Days with min	107	28	2000	14
-20 C (-4 F): Days with min	28	4	1918	1
20 C (68 F): Tropical nights (min	107	52	1943	56
25 C (77 F): Days with min	11	4	1930	1
10 mm (0.39 in): Days with 10 mm or more rain	103	53	1948	28
25 mm (0.98 in): Days with 25 mm or more rain	103	23	2003	6
50 mm (1.97 in): Days with 50 mm or more rain	85	7	2003	1
100 mm (3.94 in): Days with 100 mm or more rain	15	2	1972	1
200 mm (7.87 in): Days with 200 mm or more rain	1	1	1969	1
10 cm (3.9 in): Days with 10 cm or more snowfall	54	8	1966	1
25 cm (9.8 in): Days with 25 cm or more snowfall	14	3	1966	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1918.

Download the Data

Data for Louisa 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).

Louisa Threshold Days by Year (USC00445050)

Key Facts for Louisa Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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