Belfast Threshold Days by Year (USC00170480)

16 fixed thresholds counted per year at Belfast (USC00170480): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Belfast Thresholds

Belfast: days with 10 mm (0.39 in) or more of precipitation in 87 years, most in 2005 with 53.
Belfast: days with 25 mm (0.98 in) or more of precipitation in 87 years, most in 1953 with 27.
Belfast: nights with a minimum temperature at or below 0 C (32 F) in 78 years, most in 1997 with 178.
Belfast: nights with a minimum temperature at or below -10 C (14 F) in 78 years, most in 1989 with 79.
16 fixed thresholds have at least one qualifying day at Belfast.

Days at or above 30 C (86 F)

76 years with a qualifying day

Days per year at Belfast with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 26 in 1952.

Days at or above 30 C (86 F) per year at Belfast
Year	Days	Decade average
1902	5	3
1903	1	3
1946	12	16.5
1947	17	16.5
1948	14	16.5
1949	23	16.5
1950	8	12.9
1951	11	12.9
1952	26	12.9
1953	17	12.9
1954	2	12.9
1955	25	12.9
1956	6	12.9
1957	10	12.9
1958	6	12.9
1959	18	12.9
1960	6	12.5
1961	10	12.5
1962	8	12.5
1963	13	12.5
1964	10	12.5
1965	24	12.5
1966	13	12.5
1967	9	12.5
1968	17	12.5
1969	15	12.5
1970	15	15.1
1971	18	15.1
1972	9	15.1
1973	22	15.1
1974	7	15.1
1975	17	15.1
1976	20	15.1
1977	14	15.1
1978	16	15.1
1979	13	15.1
1980	10	10.3
1981	8	10.3
1982	10	10.3
1983	24	10.3
1984	17	10.3
1986	1	10.3
1987	4	10.3
1988	13	10.3
1989	6	10.3
1990	10	10.1
1991	19	10.1
1992	2	10.1
1993	15	10.1
1994	6	10.1
1996	2	10.1
1997	13	10.1
1998	9	10.1
1999	15	10.1
2000	3	8.9
2001	24	8.9
2002	18	8.9
2003	4	8.9
2004	3	8.9
2005	10	8.9
2006	5	8.9
2007	12	8.9
2008	5	8.9
2009	5	8.9
2010	12	6.9
2011	7	6.9
2012	3	6.9
2013	14	6.9
2014	3	6.9
2015	3	6.9
2016	7	6.9
2017	5	6.9
2018	8	6.9
2019	7	6.9
2020	11	11
2021	11	11

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

First to last qualifying date each year at Belfast
Year	First date	Last date
1902	1902-05-23	1902-07-31
1903	1903-07-02	1903-07-02
1946	1946-06-27	1946-09-19
1947	1947-06-07	1947-09-12
1948	1948-06-30	1948-08-29
1949	1949-06-05	1949-08-28
1950	1950-06-08	1950-10-01
1951	1951-05-16	1951-09-12
1952	1952-06-09	1952-08-29
1953	1953-05-10	1953-09-02
1954	1954-06-21	1954-08-25
1955	1955-05-22	1955-08-22
1956	1956-06-12	1956-08-18
1957	1957-05-08	1957-07-20
1958	1958-07-02	1958-08-08
1959	1959-05-22	1959-09-05
1960	1960-06-27	1960-09-08
1961	1961-06-13	1961-09-12
1962	1962-05-30	1962-07-11
1963	1963-06-24	1963-08-22
1964	1964-05-24	1964-07-29
1965	1965-06-06	1965-09-23
1966	1966-06-28	1966-09-03
1967	1967-06-04	1967-08-17
1968	1968-06-06	1968-08-14
1969	1969-05-17	1969-09-01
1970	1970-06-11	1970-08-19
1971	1971-06-19	1971-09-05
1972	1972-05-23	1972-08-08
1973	1973-06-11	1973-09-01
1974	1974-06-09	1974-08-22
1975	1975-06-19	1975-08-15
1976	1976-06-08	1976-08-23
1977	1977-05-17	1977-08-30
1978	1978-07-07	1978-08-23
1979	1979-05-09	1979-09-04
1980	1980-06-24	1980-07-31
1981	1981-06-29	1981-08-03
1982	1982-05-27	1982-08-17
1983	1983-06-13	1983-09-12
1984	1984-06-09	1984-08-17
1986	1986-07-26	1986-07-26
1987	1987-05-31	1987-08-18
1988	1988-05-28	1988-08-14
1989	1989-06-27	1989-07-28
1990	1990-07-16	1990-08-19
1991	1991-05-24	1991-09-17
1992	1992-05-22	1992-05-23
1993	1993-06-14	1993-08-29
1994	1994-06-18	1994-07-23
1996	1996-08-06	1996-08-07
1997	1997-06-10	1997-08-17
1998	1998-05-29	1998-08-10
1999	1999-06-07	1999-09-04
2000	2000-06-18	2000-09-02
2001	2001-05-02	2001-09-09
2002	2002-06-27	2002-09-11
2003	2003-06-26	2003-08-23
2004	2004-06-09	2004-08-28
2005	2005-06-25	2005-08-14
2006	2006-07-14	2006-08-03
2007	2007-05-25	2007-09-27
2008	2008-06-08	2008-07-19
2009	2009-05-22	2009-08-20
2010	2010-05-26	2010-09-02
2011	2011-07-06	2011-07-23
2012	2012-06-21	2012-07-15
2013	2013-06-01	2013-08-23
2014	2014-06-30	2014-07-24
2015	2015-07-13	2015-09-08
2016	2016-07-16	2016-09-10
2017	2017-05-19	2017-07-22
2018	2018-05-03	2018-09-07
2019	2019-07-06	2019-07-31
2020	2020-05-23	2020-08-15
2021	2021-05-27	2021-08-27

Every Fixed Threshold

Fixed thresholds at Belfast
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	76	26	1952	11
35 C (95 F): Days	18	3	1949	1
90 F (32.2 C): Days	61	15	1955	6
0 C (32 F): Ice days (max	76	66	2015	49
0 C (32 F): Frost days (min	78	178	1997	142
-10 C (14 F): Days with min	78	79	1989	42
-20 C (-4 F): Days with min	77	27	1948	2
-30 C (-22 F): Days with min	16	4	1971	1
20 C (68 F): Tropical nights (min	37	5	1973	1
10 mm (0.39 in): Days with 10 mm or more rain	87	53	2005	1
25 mm (0.98 in): Days with 25 mm or more rain	87	27	1953	1
50 mm (1.97 in): Days with 50 mm or more rain	74	12	1983	6
100 mm (3.94 in): Days with 100 mm or more rain	14	2	2005	2
200 mm (7.87 in): Days with 200 mm or more rain	1	1	2015	1
10 cm (3.9 in): Days with 10 cm or more snowfall	51	14	2015	3
25 cm (9.8 in): Days with 25 cm or more snowfall	28	4	1989	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1902.

Download the Data

Data for Belfast 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 2026-10-12. Last revised 12 October 2026 (2026-10-12).

Belfast Threshold Days by Year (USC00170480)

Key Facts for Belfast Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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