Chatham Threshold Days by Year (USC00441614)

19 fixed thresholds counted per year at Chatham (USC00441614): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Chatham Thresholds

Chatham: days with a maximum temperature at or above 30 C (86 F) in 100 years, most in 1925 with 110.
Chatham: days with a maximum temperature at or above 90 F (32.2 C) in 100 years, most in 1925 with 79.
Chatham: days with 10 mm (0.39 in) or more of precipitation in 97 years, most in 2003 with 59.
Chatham: days with 25 mm (0.98 in) or more of precipitation in 97 years, most in 1972 with 22.
19 fixed thresholds have at least one qualifying day at Chatham.

Days at or above 30 C (86 F)

100 years with a qualifying day

Days per year at Chatham with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 110 in 1925.

Days at or above 30 C (86 F) per year at Chatham
Year	Days	Decade average
1924	67	81.7
1925	110	81.7
1927	68	81.7
1930	96	80.7
1931	96	80.7
1932	75	80.7
1933	96	80.7
1934	70	80.7
1935	56	80.7
1936	94	80.7
1937	62	80.7
1938	76	80.7
1939	86	80.7
1940	51	72.4
1941	94	72.4
1942	73	72.4
1943	96	72.4
1944	84	72.4
1945	72	72.4
1946	54	72.4
1947	76	72.4
1948	55	72.4
1949	69	72.4
1950	57	79.3
1951	85	79.3
1952	82	79.3
1953	87	79.3
1954	102	79.3
1955	69	79.3
1956	81	79.3
1957	83	79.3
1958	68	79.3
1959	79	79.3
1960	73	65.3
1961	64	65.3
1962	64	65.3
1963	72	65.3
1964	62	65.3
1965	73	65.3
1966	72	65.3
1967	45	65.3
1968	63	65.3
1969	65	65.3
1970	75	60.5
1971	44	60.5
1972	50	60.5
1973	61	60.5
1974	32	60.5
1975	79	60.5
1976	62	60.5
1977	82	60.5
1978	72	60.5
1979	48	60.5
1980	86	68.6
1981	60	68.6
1982	62	68.6
1983	83	68.6
1984	57	68.6
1985	65	68.6
1986	83	68.6
1987	76	68.6
1988	68	68.6
1989	46	68.6
1990	67	62.4
1991	88	62.4
1992	44	62.4
1993	86	62.4
1994	58	62.4
1995	49	62.4
1996	46	62.4
1997	43	62.4
1998	79	62.4
1999	64	62.4
2000	40	51.7
2001	43	51.7
2002	76	51.7
2003	38	51.7
2004	37	51.7
2005	51	51.7
2006	59	51.7
2007	85	51.7
2008	49	51.7
2009	39	51.7
2010	85	53
2011	73	53
2012	51	53
2013	26	53
2014	30	53
2015	33	53
2016	45	53
2017	47	53
2018	60	53
2019	80	53
2020	55	58.4
2021	57	58.4
2022	58	58.4
2023	48	58.4
2024	45	58.4
2025	57	58.4
2026	89	58.4

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

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

Every Fixed Threshold

Fixed thresholds at Chatham
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	100	110	1925	89
35 C (95 F): Days	80	37	1925	11
40 C (104 F): Days	6	2	1952	1
90 F (32.2 C): Days	100	79	1925	39
100 F (37.8 C): Days	23	14	1930	1
0 C (32 F): Ice days (max	90	14	1963	7
0 C (32 F): Frost days (min	95	160	1981	67
-10 C (14 F): Days with min	93	37	1981	14
-20 C (-4 F): Days with min	6	2	1985	2
20 C (68 F): Tropical nights (min	91	47	1949	40
25 C (77 F): Days with min	5	1	1927	1
10 mm (0.39 in): Days with 10 mm or more rain	97	59	2003	24
25 mm (0.98 in): Days with 25 mm or more rain	97	22	1972	4
50 mm (1.97 in): Days with 50 mm or more rain	83	10	2018	1
100 mm (3.94 in): Days with 100 mm or more rain	14	2	1987	1
200 mm (7.87 in): Days with 200 mm or more rain	2	1	1944	1
10 cm (3.9 in): Days with 10 cm or more snowfall	43	6	1966	1
25 cm (9.8 in): Days with 25 cm or more snowfall	10	1	1930	1
50 cm (19.7 in): Days with 50 cm or more snowfall	1	1	1940	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1924.

Download the Data

Data for Chatham 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).

Chatham Threshold Days by Year (USC00441614)

Key Facts for Chatham Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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