Chatham Threshold Days by Year (USC00161703)

16 fixed thresholds counted per year at Chatham (USC00161703): 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 28 years, most in 1974 with 61.
Chatham: days with 25 mm (0.98 in) or more of precipitation in 28 years, most in 1961 with 27.
Chatham: days with 50 mm (1.97 in) or more of precipitation in 26 years, most in 1953 with 9.
Chatham: days with a maximum temperature at or above 30 C (86 F) in 25 years, most in 1963 with 172.
16 fixed thresholds have at least one qualifying day at Chatham.

Days at or above 30 C (86 F)

25 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 172 in 1963.

Days at or above 30 C (86 F) per year at Chatham
Year	Days	Decade average
1950	122	137.7
1951	128	137.7
1952	139	137.7
1953	147	137.7
1954	140	137.7
1955	157	137.7
1956	153	137.7
1957	114	137.7
1958	128	137.7
1959	149	137.7
1960	135	137
1961	118	137
1962	155	137
1963	172	137
1964	135	137
1965	138	137
1966	124	137
1967	131	137
1968	125	137
1969	137	137
1970	135	123.4
1971	132	123.4
1972	117	123.4
1973	128	123.4
1974	105	123.4

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
1950	1950-03-25	1950-10-31
1951	1951-03-11	1951-11-01
1952	1952-03-22	1952-11-18
1953	1953-03-19	1953-10-22
1954	1954-03-12	1954-10-15
1955	1955-03-06	1955-11-15
1956	1956-03-07	1956-10-24
1957	1957-04-18	1957-09-22
1958	1958-04-04	1958-10-10
1959	1959-04-20	1959-10-13
1960	1960-04-07	1960-10-25
1961	1961-04-29	1961-10-13
1962	1962-04-20	1962-10-21
1963	1963-03-14	1963-10-28
1964	1964-04-08	1964-10-19
1965	1965-04-04	1965-10-15
1966	1966-04-01	1966-10-10
1967	1967-03-12	1967-10-15
1968	1968-03-11	1968-10-17
1969	1969-04-04	1969-10-20
1970	1970-04-21	1970-10-06
1971	1971-04-20	1971-11-03
1972	1972-03-28	1972-10-19
1973	1973-05-10	1973-10-11
1974	1974-03-20	1974-09-21

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	25	172	1963	105
35 C (95 F): Days	25	86	1954	12
40 C (104 F): Days	5	7	1954	1
90 F (32.2 C): Days	25	127	1963	67
100 F (37.8 C): Days	13	41	1954	1
0 C (32 F): Ice days (max	13	7	1963	4
0 C (32 F): Frost days (min	25	86	1963	47
-10 C (14 F): Days with min	10	13	1963	4
-20 C (-4 F): Days with min	2	1	1951	1
20 C (68 F): Tropical nights (min	25	89	1964	69
25 C (77 F): Days with min	7	5	1969	5
10 mm (0.39 in): Days with 10 mm or more rain	28	61	1974	61
25 mm (0.98 in): Days with 25 mm or more rain	28	27	1961	24
50 mm (1.97 in): Days with 50 mm or more rain	26	9	1953	5
100 mm (3.94 in): Days with 100 mm or more rain	11	1	1946	1
10 cm (3.9 in): Days with 10 cm or more snowfall	4	1	1960	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1950.

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 (USC00161703)

Key Facts for Chatham Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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