South Weymouth NAS Threshold Days by Year (USW00014790)

16 fixed thresholds counted per year at South Weymouth NAS (USW00014790): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for South Weymouth NAS Thresholds

South Weymouth NAS: days with a maximum temperature at or above 30 C (86 F) in 41 years, most in 1995 with 47.
South Weymouth NAS: days with a maximum temperature at or above 90 F (32.2 C) in 41 years, most in 1988 with 34.
South Weymouth NAS: days with a maximum temperature at or below 0 C (32 F) in 41 years, most in 1963 with 44.
South Weymouth NAS: nights with a minimum temperature at or below 0 C (32 F) in 41 years, most in 1965 with 155.
16 fixed thresholds have at least one qualifying day at South Weymouth NAS.

Days at or above 30 C (86 F)

41 years with a qualifying day

Days per year at South Weymouth NAS with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 47 in 1995.

Days at or above 30 C (86 F) per year at South Weymouth NAS
Year	Days	Decade average
1955	36	26.8
1956	19	26.8
1957	25	26.8
1958	18	26.8
1959	36	26.8
1960	19	22.5
1961	18	22.5
1962	12	22.5
1963	20	22.5
1964	10	22.5
1965	37	22.5
1966	28	22.5
1967	26	22.5
1968	29	22.5
1969	26	22.5
1970	25	24.4
1971	34	24.4
1972	18	24.4
1973	22	24.4
1974	19	24.4
1975	19	24.4
1976	21	24.4
1977	38	24.4
1978	25	24.4
1979	23	24.4
1980	39	29.3
1981	24	29.3
1982	16	29.3
1983	42	29.3
1984	28	29.3
1985	31	29.3
1986	12	29.3
1987	33	29.3
1988	46	29.3
1989	22	29.3
1990	24	36.3
1991	42	36.3
1992	24	36.3
1993	41	36.3
1994	40	36.3
1995	47	36.3

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

First to last qualifying date each year at South Weymouth NAS
Year	First date	Last date
1955	1955-05-24	1955-08-22
1956	1956-05-31	1956-10-16
1957	1957-04-21	1957-09-16
1958	1958-06-30	1958-09-26
1959	1959-05-12	1959-09-24
1960	1960-06-16	1960-09-08
1961	1961-06-13	1961-09-12
1962	1962-04-27	1962-09-10
1963	1963-05-09	1963-10-07
1964	1964-04-18	1964-08-30
1965	1965-05-04	1965-09-23
1966	1966-06-04	1966-09-02
1967	1967-06-02	1967-09-08
1968	1968-06-06	1968-09-22
1969	1969-05-17	1969-09-01
1970	1970-05-10	1970-09-25
1971	1971-06-07	1971-09-16
1972	1972-05-28	1972-08-28
1973	1973-06-08	1973-09-04
1974	1974-05-17	1974-08-28
1975	1975-06-19	1975-08-03
1976	1976-04-18	1976-08-23
1977	1977-05-17	1977-09-02
1978	1978-05-28	1978-09-21
1979	1979-05-09	1979-10-22
1980	1980-05-22	1980-09-22
1981	1981-05-25	1981-09-14
1982	1982-07-07	1982-09-11
1983	1983-06-13	1983-09-20
1984	1984-06-05	1984-08-22
1985	1985-05-11	1985-09-21
1986	1986-05-18	1986-09-30
1987	1987-05-10	1987-08-20
1988	1988-05-23	1988-08-28
1989	1989-06-02	1989-09-10
1990	1990-04-27	1990-09-02
1991	1991-04-07	1991-09-17
1992	1992-05-21	1992-09-18
1993	1993-05-09	1993-09-15
1994	1994-05-22	1994-09-17
1995	1995-05-31	1995-09-05

Every Fixed Threshold

Fixed thresholds at South Weymouth NAS
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	41	47	1995	47
35 C (95 F): Days	24	17	1988	4
90 F (32.2 C): Days	41	34	1988	20
100 F (37.8 C): Days	5	2	1988	1
0 C (32 F): Ice days (max	41	44	1963	15
0 C (32 F): Frost days (min	41	155	1965	104
-10 C (14 F): Days with min	41	47	1962	11
-20 C (-4 F): Days with min	19	5	1961	1
20 C (68 F): Tropical nights (min	41	32	1988	20
25 C (77 F): Days with min	6	3	1975	1
10 mm (0.39 in): Days with 10 mm or more rain	41	49	1956	32
25 mm (0.98 in): Days with 25 mm or more rain	41	19	1983	10
50 mm (1.97 in): Days with 50 mm or more rain	36	6	1955	3
100 mm (3.94 in): Days with 100 mm or more rain	1	2	1955	2
10 cm (3.9 in): Days with 10 cm or more snowfall	39	7	1956	4
25 cm (9.8 in): Days with 25 cm or more snowfall	17	3	1978	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1955.

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Data for South Weymouth NAS 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).

South Weymouth NAS Threshold Days by Year (USW00014790)

Key Facts for South Weymouth NAS Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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