Chatham Threshold Days by Year (CA006131386)

17 fixed thresholds counted per year at Chatham (CA006131386): 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 34 years, most in 1955 with 48.
Chatham: days with a maximum temperature at or below 0 C (32 F) in 34 years, most in 1963 with 76.
Chatham: nights with a minimum temperature at or below 0 C (32 F) in 34 years, most in 1934 with 147.
Chatham: nights with a minimum temperature at or below -10 C (14 F) in 34 years, most in 1934 with 52.
17 fixed thresholds have at least one qualifying day at Chatham.

Days at or above 30 C (86 F)

34 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 48 in 1955.

Days at or above 30 C (86 F) per year at Chatham
Year	Days	Decade average
1934	46	32.8
1935	26	32.8
1936	42	32.8
1937	27	32.8
1938	23	32.8
1939	33	32.8
1940	22	26.5
1941	36	26.5
1942	19	26.5
1943	23	26.5
1944	41	26.5
1945	21	26.5
1946	23	26.5
1947	28	26.5
1948	21	26.5
1949	31	26.5
1950	12	23.7
1951	11	23.7
1952	36	23.7
1953	29	23.7
1954	30	23.7
1955	48	23.7
1956	18	23.7
1957	15	23.7
1958	6	23.7
1959	32	23.7
1960	11	20.1
1961	17	20.1
1962	20	20.1
1963	23	20.1
1964	29	20.1
1965	15	20.1
1966	26	20.1
1967	20	20.1

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
1934	1934-05-19	1934-08-19
1935	1935-06-14	1935-09-18
1936	1936-05-07	1936-09-23
1937	1937-05-31	1937-09-03
1938	1938-06-22	1938-08-29
1939	1939-05-19	1939-09-16
1940	1940-06-07	1940-09-20
1941	1941-05-21	1941-09-22
1942	1942-05-01	1942-09-15
1943	1943-06-04	1943-09-01
1944	1944-05-26	1944-09-04
1945	1945-06-14	1945-09-08
1946	1946-06-24	1946-10-06
1947	1947-06-10	1947-09-19
1948	1948-06-04	1948-09-19
1949	1949-05-04	1949-08-27
1950	1950-06-16	1950-08-28
1951	1951-07-10	1951-10-05
1952	1952-06-06	1952-09-13
1953	1953-06-05	1953-09-04
1954	1954-06-10	1954-09-07
1955	1955-05-03	1955-09-19
1956	1956-05-30	1956-08-31
1957	1957-06-16	1957-09-02
1958	1958-06-30	1958-08-12
1959	1959-06-08	1959-09-23
1960	1960-06-04	1960-09-08
1961	1961-06-12	1961-09-13
1962	1962-05-14	1962-09-13
1963	1963-06-06	1963-10-07
1964	1964-05-23	1964-09-10
1965	1965-06-06	1965-09-21
1966	1966-05-27	1966-08-30
1967	1967-06-09	1967-08-19

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	34	48	1955	20
35 C (95 F): Days	19	10	1934	2
40 C (104 F): Days	1	1	1936	1
90 F (32.2 C): Days	33	28	1934	5
100 F (37.8 C): Days	2	7	1936	7
0 C (32 F): Ice days (max	34	76	1963	40
0 C (32 F): Frost days (min	34	147	1934	105
-10 C (14 F): Days with min	34	52	1934	21
-20 C (-4 F): Days with min	19	10	1934	2
20 C (68 F): Tropical nights (min	34	40	1955	10
25 C (77 F): Days with min	9	2	1936	1
10 mm (0.39 in): Days with 10 mm or more rain	34	36	1951	29
25 mm (0.98 in): Days with 25 mm or more rain	33	9	1967	9
50 mm (1.97 in): Days with 50 mm or more rain	13	2	1946	1
100 mm (3.94 in): Days with 100 mm or more rain	1	1	1946	1
10 cm (3.9 in): Days with 10 cm or more snowfall	28	6	1951	2
25 cm (9.8 in): Days with 25 cm or more snowfall	4	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 1934.

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 (CA006131386)

Key Facts for Chatham Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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