Hartwell Threshold Days by Year (USC00094133)

17 fixed thresholds counted per year at Hartwell (USC00094133): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Hartwell Thresholds

Hartwell: days with a maximum temperature at or above 30 C (86 F) in 103 years, most in 1954 with 140.
Hartwell: days with a maximum temperature at or above 90 F (32.2 C) in 102 years, most in 1954 with 118.
Hartwell: nights with a minimum temperature at or below 0 C (32 F) in 102 years, most in 1960 with 80.
Hartwell: nights with a minimum temperature at or above 20 C (68 F) in 102 years, most in 2018 with 112.
17 fixed thresholds have at least one qualifying day at Hartwell.

Days at or above 30 C (86 F)

103 years with a qualifying day

Days per year at Hartwell with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 140 in 1954.

Days at or above 30 C (86 F) per year at Hartwell
Year	Days	Decade average
1909	101	101
1914	106	106.7
1915	116	106.7
1917	98	106.7
1920	89	109.3
1921	110	109.3
1922	108	109.3
1923	101	109.3
1925	138	109.3
1926	123	109.3
1927	122	109.3
1928	87	109.3
1929	106	109.3
1930	110	108.4
1931	122	108.4
1932	91	108.4
1933	117	108.4
1934	106	108.4
1935	99	108.4
1936	116	108.4
1937	106	108.4
1938	104	108.4
1939	113	108.4
1940	101	99.2
1941	130	99.2
1942	100	99.2
1943	112	99.2
1944	105	99.2
1945	102	99.2
1946	72	99.2
1947	93	99.2
1948	78	99.2
1950	92	119.8
1951	118	119.8
1952	120	119.8
1953	125	119.8
1954	140	119.8
1955	127	119.8
1956	122	119.8
1957	123	119.8
1958	111	119.8
1959	120	119.8
1960	116	107
1963	112	107
1964	111	107
1965	124	107
1966	90	107
1967	93	107
1968	107	107
1969	103	107
1970	129	95.6
1971	123	95.6
1972	108	95.6
1973	88	95.6
1974	82	95.6
1975	84	95.6
1976	70	95.6
1977	109	95.6
1978	107	95.6
1979	56	95.6
1981	91	90.6
1982	93	90.6
1983	82	90.6
1984	72	90.6
1985	81	90.6
1986	120	90.6
1987	95	90.6
1990	89	64.4
1992	45	64.4
1993	94	64.4
1994	28	64.4
1995	55	64.4
1996	58	64.4
1997	51	64.4
1998	101	64.4
1999	59	64.4
2000	78	63.2
2001	41	63.2
2002	75	63.2
2003	30	63.2
2004	57	63.2
2005	64	63.2
2006	72	63.2
2007	78	63.2
2008	70	63.2
2009	67	63.2
2010	86	86
2011	95	86
2012	56	86
2013	43	86
2014	88	86
2015	83	86
2016	120	86
2017	78	86
2018	106	86
2019	105	86
2020	71	87.4
2021	79	87.4
2022	99	87.4
2023	78	87.4
2024	100	87.4
2025	74	87.4
2026	111	87.4

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

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

Every Fixed Threshold

Fixed thresholds at Hartwell
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	103	140	1954	111
35 C (95 F): Days	94	86	1925	24
40 C (104 F): Days	18	11	1925	2
90 F (32.2 C): Days	102	118	1954	68
100 F (37.8 C): Days	59	34	1954	1
0 C (32 F): Ice days (max	43	8	1917	1
0 C (32 F): Frost days (min	102	80	1960	36
-10 C (14 F): Days with min	57	8	1917	2
-20 C (-4 F): Days with min	2	1	1940	1
20 C (68 F): Tropical nights (min	102	112	2018	105
25 C (77 F): Days with min	26	12	1925	1
10 mm (0.39 in): Days with 10 mm or more rain	102	61	1971	21
25 mm (0.98 in): Days with 25 mm or more rain	102	29	2020	9
50 mm (1.97 in): Days with 50 mm or more rain	97	10	1990	1
100 mm (3.94 in): Days with 100 mm or more rain	23	3	2004	1
10 cm (3.9 in): Days with 10 cm or more snowfall	12	2	1930	1
25 cm (9.8 in): Days with 25 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 1909.

Download the Data

Data for Hartwell 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).

Hartwell Threshold Days by Year (USC00094133)

Key Facts for Hartwell Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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