Holter Dam Threshold Days by Year (USC00244241)

18 fixed thresholds counted per year at Holter Dam (USC00244241): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Holter Dam Thresholds

Holter Dam: days with a maximum temperature at or above 30 C (86 F) in 120 years, most in 1988 with 71.
Holter Dam: days with a maximum temperature at or below 0 C (32 F) in 120 years, most in 1937 with 59.
Holter Dam: days with a maximum temperature at or above 90 F (32.2 C) in 119 years, most in 2003 with 50.
Holter Dam: nights with a minimum temperature at or below 0 C (32 F) in 118 years, most in 1905 with 179.
18 fixed thresholds have at least one qualifying day at Holter Dam.

Days at or above 30 C (86 F)

120 years with a qualifying day

Days per year at Holter Dam with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 71 in 1988.

Days at or above 30 C (86 F) per year at Holter Dam
Year	Days	Decade average
1904	30	23.2
1905	21	23.2
1906	27	23.2
1907	8	23.2
1909	30	23.2
1910	47	41.3
1911	32	41.3
1912	23	41.3
1913	38	41.3
1914	44	41.3
1915	22	41.3
1917	55	41.3
1919	69	41.3
1920	41	36.9
1921	46	36.9
1922	44	36.9
1923	30	36.9
1924	39	36.9
1925	33	36.9
1926	35	36.9
1927	18	36.9
1928	27	36.9
1929	56	36.9
1930	56	55.2
1931	54	55.2
1932	46	55.2
1933	64	55.2
1934	57	55.2
1935	52	55.2
1936	65	55.2
1937	56	55.2
1938	46	55.2
1939	56	55.2
1940	61	37.4
1941	48	37.4
1942	41	37.4
1943	37	37.4
1944	22	37.4
1945	43	37.4
1946	31	37.4
1947	37	37.4
1948	22	37.4
1949	32	37.4
1950	22	32.9
1951	25	32.9
1952	31	32.9
1953	39	32.9
1954	34	32.9
1955	36	32.9
1956	31	32.9
1957	34	32.9
1958	37	32.9
1959	40	32.9
1960	32	36.3
1961	59	36.3
1962	26	36.3
1963	40	36.3
1964	36	36.3
1965	20	36.3
1966	39	36.3
1967	49	36.3
1968	20	36.3
1969	42	36.3
1970	47	33.1
1971	42	33.1
1972	23	33.1
1973	39	33.1
1974	38	33.1
1975	15	33.1
1976	25	33.1
1977	30	33.1
1978	26	33.1
1979	46	33.1
1980	17	39.7
1981	37	39.7
1982	34	39.7
1983	31	39.7
1984	49	39.7
1985	43	39.7
1986	44	39.7
1987	39	39.7
1988	71	39.7
1989	32	39.7
1990	46	40.7
1991	52	40.7
1992	40	40.7
1993	10	40.7
1994	58	40.7
1995	25	40.7
1996	46	40.7
1997	31	40.7
1998	55	40.7
1999	44	40.7
2000	55	54.8
2001	64	54.8
2002	43	54.8
2003	68	54.8
2004	37	54.8
2005	52	54.8
2006	64	54.8
2007	65	54.8
2008	50	54.8
2009	50	54.8
2010	32	45.9
2011	63	45.9
2012	63	45.9
2013	51	45.9
2014	41	45.9
2015	41	45.9
2016	43	45.9
2017	53	45.9
2018	35	45.9
2019	37	45.9
2020	44	46
2021	58	46
2022	53	46
2023	27	46
2024	48	46
2025	47	46
2026	45	46

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

First to last qualifying date each year at Holter Dam
Year	First date	Last date
1904	1904-06-17	1904-09-08
1905	1905-07-09	1905-09-22
1906	1906-07-04	1906-09-24
1907	1907-07-03	1907-09-01
1909	1909-06-18	1909-08-30
1910	1910-04-19	1910-08-26
1911	1911-05-05	1911-09-01
1912	1912-06-19	1912-08-26
1913	1913-04-13	1913-10-01
1914	1914-05-31	1914-09-04
1915	1915-06-24	1915-08-31
1917	1917-05-15	1917-10-06
1919	1919-05-19	1919-09-12
1920	1920-07-01	1920-09-17
1921	1921-06-11	1921-09-02
1922	1922-05-24	1922-09-21
1923	1923-06-12	1923-09-09
1924	1924-05-15	1924-09-16
1925	1925-06-21	1925-09-04
1926	1926-06-04	1926-08-29
1927	1927-07-07	1927-09-06
1928	1928-05-06	1928-09-05
1929	1929-05-22	1929-09-01
1930	1930-06-07	1930-09-04
1931	1931-05-14	1931-09-06
1932	1932-05-12	1932-09-12
1933	1933-05-30	1933-09-05
1934	1934-05-15	1934-09-07
1935	1935-06-11	1935-09-29
1936	1936-05-14	1936-09-22
1937	1937-06-02	1937-09-18
1938	1938-06-05	1938-09-22
1939	1939-05-15	1939-09-20
1940	1940-05-24	1940-09-12
1941	1941-05-12	1941-08-23
1942	1942-06-30	1942-09-08
1943	1943-07-06	1943-09-17
1944	1944-06-24	1944-09-13
1945	1945-06-21	1945-09-13
1946	1946-06-03	1946-09-14
1947	1947-05-02	1947-09-05
1948	1948-06-30	1948-09-14
1949	1949-06-09	1949-08-23
1950	1950-06-30	1950-09-06
1951	1951-07-14	1951-08-18
1952	1952-07-03	1952-09-30
1953	1953-06-11	1953-09-15
1954	1954-05-19	1954-08-30
1955	1955-07-15	1955-09-07
1956	1956-06-08	1956-09-19
1957	1957-06-03	1957-09-07
1958	1958-05-20	1958-09-11
1959	1959-06-14	1959-09-14
1960	1960-05-12	1960-08-22
1961	1961-06-05	1961-08-28
1962	1962-06-29	1962-08-27
1963	1963-06-18	1963-09-30
1964	1964-05-20	1964-08-19
1965	1965-07-06	1965-08-12
1966	1966-05-06	1966-09-23
1967	1967-07-04	1967-09-29
1968	1968-06-02	1968-08-07
1969	1969-06-04	1969-09-08
1970	1970-06-04	1970-08-29
1971	1971-06-21	1971-08-29
1972	1972-06-06	1972-08-30
1973	1973-06-22	1973-08-30
1974	1974-06-11	1974-08-18
1975	1975-07-05	1975-08-07
1976	1976-05-28	1976-09-06
1977	1977-06-05	1977-09-08
1978	1978-06-29	1978-09-05
1979	1979-06-11	1979-09-16
1980	1980-07-10	1980-09-06
1981	1981-06-26	1981-09-13
1982	1982-07-19	1982-09-10
1983	1983-06-10	1983-09-02
1984	1984-05-29	1984-09-19
1985	1985-05-23	1985-08-30
1986	1986-05-27	1986-08-29
1987	1987-04-28	1987-09-03
1988	1988-05-23	1988-09-07
1989	1989-07-01	1989-08-14
1990	1990-06-23	1990-09-24
1991	1991-07-03	1991-09-07
1992	1992-05-06	1992-09-23
1993	1993-06-19	1993-08-21
1994	1994-06-20	1994-09-09
1995	1995-07-08	1995-09-04
1996	1996-06-07	1996-08-31
1997	1997-06-26	1997-10-01
1998	1998-07-07	1998-09-18
1999	1999-07-07	1999-09-23
2000	2000-06-05	2000-09-18
2001	2001-05-12	2001-09-26
2002	2002-05-20	2002-09-16
2003	2003-05-25	2003-09-07
2004	2004-06-05	2004-09-11
2005	2005-06-20	2005-09-09
2006	2006-05-15	2006-09-13
2007	2007-05-17	2007-09-04
2008	2008-05-17	2008-09-20
2009	2009-05-19	2009-09-25
2010	2010-06-28	2010-10-03
2011	2011-06-22	2011-10-03
2012	2012-05-15	2012-09-14
2013	2013-06-28	2013-09-05
2014	2014-07-02	2014-09-26
2015	2015-06-08	2015-09-26
2016	2016-06-06	2016-09-02
2017	2017-06-08	2017-09-13
2018	2018-06-09	2018-09-07
2019	2019-06-13	2019-09-16
2020	2020-06-12	2020-09-06
2021	2021-06-02	2021-09-26
2022	2022-06-17	2022-09-08
2023	2023-06-30	2023-09-18
2024	2024-06-23	2024-09-26
2025	2025-05-30	2025-09-27
2026	2026-05-28	2026-09-26

Every Fixed Threshold

Fixed thresholds at Holter Dam
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	120	71	1988	45
35 C (95 F): Days	104	26	2007	11
40 C (104 F): Days	5	3	2002	3
90 F (32.2 C): Days	119	50	2003	29
100 F (37.8 C): Days	28	10	2007	2
0 C (32 F): Ice days (max	120	59	1937	10
0 C (32 F): Frost days (min	118	179	1905	75
-10 C (14 F): Days with min	118	71	1996	12
-20 C (-4 F): Days with min	116	33	1917	3
-30 C (-22 F): Days with min	65	9	1909	1
-40 C (-40 F): Days with min	4	3	1909	1
20 C (68 F): Tropical nights (min	63	10	1936	1
25 C (77 F): Days with min	2	1	1931	1
10 mm (0.39 in): Days with 10 mm or more rain	116	15	1911	9
25 mm (0.98 in): Days with 25 mm or more rain	80	4	1914	2
50 mm (1.97 in): Days with 50 mm or more rain	15	2	1953	1
10 cm (3.9 in): Days with 10 cm or more snowfall	68	7	2003	1
25 cm (9.8 in): Days with 25 cm or more snowfall	9	1	1914	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1904.

Download the Data

Data for Holter Dam 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).

Holter Dam Threshold Days by Year (USC00244241)

Key Facts for Holter Dam Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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