Chatham Threshold Days by Year (USC00191386)

14 fixed thresholds counted per year at Chatham (USC00191386): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Chatham Thresholds

Chatham: days with 10 mm (0.39 in) or more of precipitation in 43 years, most in 1983 with 48.
Chatham: days with 25 mm (0.98 in) or more of precipitation in 43 years, most in 1998 with 21.
Chatham: days with a maximum temperature at or below 0 C (32 F) in 40 years, most in 1989 with 33.
Chatham: nights with a minimum temperature at or below 0 C (32 F) in 39 years, most in 1976 with 107.
14 fixed thresholds have at least one qualifying day at Chatham.

Days at or above 30 C (86 F)

27 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 5 in 1999.

Days at or above 30 C (86 F) per year at Chatham
Year	Days	Decade average
1973	1	1.2
1974	1	1.2
1975	1	1.2
1977	2	1.2
1978	1	1.2
1979	1	1.2
1980	2	1.8
1981	2	1.8
1983	2	1.8
1984	1	1.8
1990	1	2.2
1993	1	2.2
1994	1	2.2
1997	3	2.2
1999	5	2.2
2002	5	2
2003	1	2
2005	2	2
2006	2	2
2007	1	2
2008	1	2
2010	3	2
2012	1	2
2016	4	2
2018	1	2
2019	1	2
2020	1	1

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
1973	1973-08-30	1973-08-30
1974	1974-07-10	1974-07-10
1975	1975-08-02	1975-08-02
1977	1977-07-18	1977-07-20
1978	1978-06-28	1978-06-28
1979	1979-08-08	1979-08-08
1980	1980-08-07	1980-08-09
1981	1981-07-09	1981-07-11
1983	1983-06-23	1983-07-13
1984	1984-06-10	1984-06-10
1990	1990-07-05	1990-07-05
1993	1993-07-10	1993-07-10
1994	1994-06-19	1994-06-19
1997	1997-06-12	1997-07-13
1999	1999-07-06	1999-07-30
2002	2002-07-04	2002-08-18
2003	2003-07-07	2003-07-07
2005	2005-07-12	2005-07-21
2006	2006-08-03	2006-08-04
2007	2007-05-26	2007-05-26
2008	2008-06-10	2008-06-10
2010	2010-07-05	2010-08-07
2012	2012-06-22	2012-06-22
2016	2016-07-27	2016-08-30
2018	2018-08-31	2018-08-31
2019	2019-07-21	2019-07-21
2020	2020-07-29	2020-07-29

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	27	5	1999	1
35 C (95 F): Days	1	1	1999	1
90 F (32.2 C): Days	3	1	1975	1
0 C (32 F): Ice days (max	40	33	1989	4
0 C (32 F): Frost days (min	39	107	1976	63
-10 C (14 F): Days with min	39	18	1977	1
-20 C (-4 F): Days with min	1	1	2016	1
20 C (68 F): Tropical nights (min	37	17	2012	14
10 mm (0.39 in): Days with 10 mm or more rain	43	48	1983	28
25 mm (0.98 in): Days with 25 mm or more rain	43	21	1998	4
50 mm (1.97 in): Days with 50 mm or more rain	39	6	1975	1
100 mm (3.94 in): Days with 100 mm or more rain	2	1	1982	1
10 cm (3.9 in): Days with 10 cm or more snowfall	38	6	1994	1
25 cm (9.8 in): Days with 25 cm or more snowfall	9	2	1996	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1973.

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 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Chatham Threshold Days by Year (USC00191386)

Key Facts for Chatham Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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