Hemlock Threshold Days by Year (USC00303773)

18 fixed thresholds counted per year at Hemlock (USC00303773): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Hemlock Thresholds

Hemlock: days with 10 mm (0.39 in) or more of precipitation in 122 years, most in 2011 with 41.
Hemlock: days with 25 mm (0.98 in) or more of precipitation in 121 years, most in 1977 with 12.
Hemlock: days with a maximum temperature at or above 30 C (86 F) in 119 years, most in 1955 with 47.
Hemlock: days with a maximum temperature at or below 0 C (32 F) in 119 years, most in 1904 with 78.
18 fixed thresholds have at least one qualifying day at Hemlock.

Days at or above 30 C (86 F)

119 years with a qualifying day

Days per year at Hemlock with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 47 in 1955.

Days at or above 30 C (86 F) per year at Hemlock
Year	Days	Decade average
1899	20	20
1900	25	9.3
1901	23	9.3
1902	2	9.3
1903	3	9.3
1904	2	9.3
1906	7	9.3
1907	6	9.3
1908	11	9.3
1909	5	9.3
1910	6	15.9
1911	22	15.9
1913	14	15.9
1914	8	15.9
1915	15	15.9
1916	29	15.9
1917	10	15.9
1918	19	15.9
1919	20	15.9
1920	3	12.9
1921	32	12.9
1922	8	12.9
1923	7	12.9
1924	7	12.9
1925	11	12.9
1926	8	12.9
1927	11	12.9
1928	14	12.9
1929	28	12.9
1930	24	22.7
1931	27	22.7
1932	16	22.7
1933	23	22.7
1934	26	22.7
1935	14	22.7
1936	26	22.7
1937	24	22.7
1938	25	22.7
1939	22	22.7
1940	9	18.2
1941	24	18.2
1942	12	18.2
1943	18	18.2
1944	22	18.2
1945	15	18.2
1946	13	18.2
1947	22	18.2
1948	13	18.2
1949	34	18.2
1950	5	19.7
1951	12	19.7
1952	40	19.7
1953	28	19.7
1954	12	19.7
1955	47	19.7
1956	7	19.7
1957	10	19.7
1958	2	19.7
1959	34	19.7
1960	7	16.6
1961	12	16.6
1962	12	16.6
1963	17	16.6
1964	25	16.6
1965	18	16.6
1966	26	16.6
1967	10	16.6
1968	20	16.6
1969	19	16.6
1970	19	14.7
1971	14	14.7
1972	11	14.7
1973	22	14.7
1974	15	14.7
1975	13	14.7
1976	5	14.7
1977	12	14.7
1978	18	14.7
1979	18	14.7
1980	20	17.2
1981	11	17.2
1986	11	17.2
1987	19	17.2
1988	32	17.2
1989	10	17.2
1990	12	12.1
1994	8	12.1
1995	24	12.1
1996	7	12.1
1997	4	12.1
1998	4	12.1
1999	26	12.1
2000	4	14
2001	22	14
2002	28	14
2003	5	14
2004	1	14
2005	29	14
2006	12	14
2007	25	14
2008	10	14
2009	4	14
2010	16	16.6
2011	15	16.6
2012	27	16.6
2013	14	16.6
2014	5	16.6
2015	12	16.6
2016	36	16.6
2017	8	16.6
2018	23	16.6
2019	10	16.6
2020	23	19.9
2021	18	19.9
2022	24	19.9
2023	11	19.9
2024	18	19.9
2025	29	19.9
2026	16	19.9

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

First to last qualifying date each year at Hemlock
Year	First date	Last date
1899	1899-06-05	1899-09-03
1900	1900-06-14	1900-09-26
1901	1901-06-13	1901-08-22
1902	1902-07-07	1902-07-08
1903	1903-07-08	1903-07-10
1904	1904-07-17	1904-07-19
1906	1906-06-08	1906-08-23
1907	1907-06-18	1907-08-12
1908	1908-06-08	1908-08-04
1909	1909-06-28	1909-09-14
1910	1910-07-01	1910-07-28
1911	1911-05-18	1911-08-10
1913	1913-06-16	1913-09-03
1914	1914-06-09	1914-08-09
1915	1915-04-25	1915-09-15
1916	1916-06-24	1916-09-07
1917	1917-06-13	1917-08-20
1918	1918-06-01	1918-08-23
1919	1919-05-31	1919-08-07
1920	1920-06-28	1920-07-13
1921	1921-05-21	1921-09-10
1922	1922-06-24	1922-09-10
1923	1923-06-05	1923-08-11
1924	1924-06-20	1924-08-31
1925	1925-06-01	1925-08-30
1926	1926-06-29	1926-08-06
1927	1927-05-22	1927-10-02
1928	1928-07-03	1928-08-27
1929	1929-05-27	1929-09-05
1930	1930-06-03	1930-09-15
1931	1931-05-28	1931-09-22
1932	1932-05-25	1932-09-01
1933	1933-06-08	1933-09-08
1934	1934-05-21	1934-08-19
1935	1935-06-16	1935-08-18
1936	1936-06-02	1936-09-23
1937	1937-05-31	1937-09-03
1938	1938-06-21	1938-08-21
1939	1939-05-27	1939-09-16
1940	1940-06-07	1940-08-10
1941	1941-06-20	1941-10-07
1942	1942-06-10	1942-08-22
1943	1943-06-04	1943-09-06
1944	1944-05-31	1944-08-16
1945	1945-06-14	1945-09-08
1946	1946-06-25	1946-07-29
1947	1947-06-10	1947-08-25
1948	1948-06-29	1948-08-28
1949	1949-06-12	1949-08-28
1950	1950-06-08	1950-08-17
1951	1951-07-15	1951-09-13
1952	1952-06-15	1952-09-14
1953	1953-06-19	1953-09-04
1954	1954-05-01	1954-09-07
1955	1955-06-06	1955-09-19
1956	1956-06-12	1956-07-27
1957	1957-06-16	1957-08-03
1958	1958-07-05	1958-08-31
1959	1959-05-20	1959-09-29
1960	1960-07-11	1960-09-08
1961	1961-06-12	1961-09-14
1962	1962-05-15	1962-08-31
1963	1963-06-24	1963-07-28
1964	1964-05-23	1964-09-10
1965	1965-06-06	1965-09-22
1966	1966-05-27	1966-08-21
1967	1967-06-11	1967-09-21
1968	1968-06-07	1968-08-20
1969	1969-05-29	1969-08-31
1970	1970-06-01	1970-09-24
1971	1971-05-19	1971-10-02
1972	1972-07-12	1972-08-31
1973	1973-06-11	1973-09-05
1974	1974-05-14	1974-08-22
1975	1975-05-22	1975-08-25
1976	1976-04-18	1976-07-11
1977	1977-04-12	1977-09-01
1978	1978-05-27	1978-09-06
1979	1979-05-08	1979-09-01
1980	1980-05-23	1980-08-30
1981	1981-06-15	1981-07-19
1986	1986-07-05	1986-09-11
1987	1987-05-28	1987-08-17
1988	1988-05-30	1988-08-14
1989	1989-07-03	1989-08-05
1990	1990-04-28	1990-08-17
1994	1994-06-15	1994-07-21
1995	1995-06-07	1995-09-02
1996	1996-05-18	1996-08-07
1997	1997-06-25	1997-07-17
1998	1998-05-16	1998-08-09
1999	1999-05-30	1999-09-05
2000	2000-07-13	2000-09-02
2001	2001-06-14	2001-09-09
2002	2002-06-21	2002-09-10
2003	2003-06-24	2003-08-15
2004	2004-06-09	2004-06-09
2005	2005-06-05	2005-08-10
2006	2006-05-29	2006-08-18
2007	2007-05-24	2007-09-25
2008	2008-06-06	2008-09-05
2009	2009-08-10	2009-08-18
2010	2010-05-26	2010-09-24
2011	2011-05-31	2011-09-03
2012	2012-05-20	2012-08-31
2013	2013-05-21	2013-09-12
2014	2014-06-02	2014-09-05
2015	2015-05-08	2015-09-08
2016	2016-05-27	2016-09-10
2017	2017-06-11	2017-09-27
2018	2018-05-30	2018-09-05
2019	2019-05-19	2019-10-01
2020	2020-05-25	2020-08-24
2021	2021-05-20	2021-08-29
2022	2022-05-21	2022-08-29
2023	2023-06-01	2023-09-06
2024	2024-06-17	2024-08-28
2025	2025-06-04	2025-08-16
2026	2026-05-18	2026-08-06

Every Fixed Threshold

Fixed thresholds at Hemlock
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	119	47	1955	16
35 C (95 F): Days	19	5	1955	2
90 F (32.2 C): Days	94	19	1988	6
100 F (37.8 C): Days	2	1	1931	1
0 C (32 F): Ice days (max	119	78	1904	35
0 C (32 F): Frost days (min	117	174	1976	85
-10 C (14 F): Days with min	117	61	1904	35
-20 C (-4 F): Days with min	99	20	1979	8
-30 C (-22 F): Days with min	8	1	1914	1
20 C (68 F): Tropical nights (min	115	30	1921	10
25 C (77 F): Days with min	12	3	1917	1
10 mm (0.39 in): Days with 10 mm or more rain	122	41	2011	33
25 mm (0.98 in): Days with 25 mm or more rain	121	12	1977	9
50 mm (1.97 in): Days with 50 mm or more rain	48	4	1914	1
100 mm (3.94 in): Days with 100 mm or more rain	3	1	1916	1
10 cm (3.9 in): Days with 10 cm or more snowfall	40	10	1959	3
25 cm (9.8 in): Days with 25 cm or more snowfall	13	2	1960	1
50 cm (19.7 in): Days with 50 cm or more snowfall	1	1	1942	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1899.

Download the Data

Data for Hemlock 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).

Hemlock Threshold Days by Year (USC00303773)

Key Facts for Hemlock Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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