Chatham Threshold Days by Year (USC00301391)

16 fixed thresholds counted per year at Chatham (USC00301391): 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 26 years, most in 1966 with 48.
Chatham: days with a maximum temperature at or above 90 F (32.2 C) in 26 years, most in 1918 with 22.
Chatham: days with a maximum temperature at or below 0 C (32 F) in 26 years, most in 1916 with 56.
Chatham: nights with a minimum temperature at or below 0 C (32 F) in 26 years, most in 1967 with 168.
16 fixed thresholds have at least one qualifying day at Chatham.

Days at or above 30 C (86 F)

26 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 1966.

Days at or above 30 C (86 F) per year at Chatham
Year	Days	Decade average
1905	29	34.6
1906	47	34.6
1907	36	34.6
1908	45	34.6
1909	16	34.6
1910	21	26.4
1911	34	26.4
1912	21	26.4
1913	31	26.4
1914	22	26.4
1915	17	26.4
1916	24	26.4
1917	17	26.4
1918	39	26.4
1919	38	26.4
1920	27	27
1960	17	33
1961	35	33
1962	33	33
1963	33	33
1964	36	33
1965	36	33
1966	48	33
1967	17	33
1968	40	33
1969	35	33

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
1905	1905-06-15	1905-08-24
1906	1906-05-16	1906-09-19
1907	1907-05-14	1907-09-16
1908	1908-05-25	1908-09-27
1909	1909-06-14	1909-08-25
1910	1910-05-24	1910-08-25
1911	1911-05-11	1911-08-15
1912	1912-05-24	1912-08-25
1913	1913-05-03	1913-09-03
1914	1914-05-26	1914-09-23
1915	1915-04-25	1915-09-17
1916	1916-07-07	1916-09-14
1917	1917-06-22	1917-08-20
1918	1918-05-18	1918-08-26
1919	1919-05-29	1919-10-03
1920	1920-06-01	1920-09-27
1960	1960-06-27	1960-09-09
1961	1961-05-14	1961-09-24
1962	1962-04-27	1962-09-02
1963	1963-06-03	1963-10-08
1964	1964-05-09	1964-09-11
1965	1965-05-16	1965-09-23
1966	1966-06-04	1966-09-03
1967	1967-06-03	1967-08-19
1968	1968-06-06	1968-09-25
1969	1969-05-29	1969-09-07

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	26	48	1966	35
35 C (95 F): Days	18	8	1911	7
90 F (32.2 C): Days	26	22	1918	9
100 F (37.8 C): Days	3	2	1911	2
0 C (32 F): Ice days (max	26	56	1916	46
0 C (32 F): Frost days (min	26	168	1967	148
-10 C (14 F): Days with min	26	63	1905	57
-20 C (-4 F): Days with min	26	20	1963	4
-30 C (-22 F): Days with min	2	1	1920	1
20 C (68 F): Tropical nights (min	26	18	1916	9
25 C (77 F): Days with min	2	2	1913	1
10 mm (0.39 in): Days with 10 mm or more rain	24	42	1920	38
25 mm (0.98 in): Days with 25 mm or more rain	24	12	1920	11
50 mm (1.97 in): Days with 50 mm or more rain	14	2	1907	1
10 cm (3.9 in): Days with 10 cm or more snowfall	9	8	1961	3
25 cm (9.8 in): Days with 25 cm or more snowfall	5	4	1966	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1905.

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 (USC00301391)

Key Facts for Chatham Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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