Danbury Threshold Days by Year

19 fixed thresholds counted per year at Danbury (USC00471978): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Danbury Thresholds

Danbury: nights with a minimum temperature at or below 0 C (32 F) in 81 years, most in 1929 with 208.
Danbury: nights with a minimum temperature at or below -10 C (14 F) in 81 years, most in 1955 with 123.
Danbury: nights with a minimum temperature at or below -20 C (-4 F) in 81 years, most in 1955 with 64.
Danbury: days with a maximum temperature at or above 30 C (86 F) in 80 years, most in 1933 with 80.
19 fixed thresholds have at least one qualifying day at Danbury.

Days at or above 30 C (86 F)

80 years with a qualifying day

Days per year at Danbury with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 80 in 1933.

Days at or above 30 C (86 F) per year at Danbury
Year	Days	Decade average
1922	30	25.1
1924	16	25.1
1925	43	25.1
1926	29	25.1
1927	10	25.1
1928	16	25.1
1929	32	25.1
1930	51	47.8
1931	55	47.8
1932	66	47.8
1933	80	47.8
1934	55	47.8
1936	44	47.8
1937	29	47.8
1938	7	47.8
1939	43	47.8
1940	33	36
1943	40	36
1944	22	36
1947	52	36
1948	35	36
1949	34	36
1951	8	20.1
1952	24	20.1
1953	25	20.1
1954	13	20.1
1955	29	20.1
1956	16	20.1
1957	19	20.1
1958	16	20.1
1959	31	20.1
1960	24	20.9
1961	32	20.9
1962	12	20.9
1963	30	20.9
1964	34	20.9
1965	9	20.9
1966	28	20.9
1967	5	20.9
1968	12	20.9
1969	23	20.9
1970	26	15.9
1971	11	15.9
1972	4	15.9
1973	9	15.9
1974	13	15.9
1975	19	15.9
1976	35	15.9
1977	17	15.9
1978	18	15.9
1979	7	15.9
1980	23	17.7
1981	7	17.7
1982	10	17.7
1983	23	17.7
1984	14	17.7
1985	6	17.7
1986	14	17.7
1987	22	17.7
1988	41	17.7
1989	17	17.7
1990	6	8.8
1991	12	8.8
1992	7	8.8
1993	6	8.8
1994	4	8.8
1995	14	8.8
1996	5	8.8
1997	9	8.8
1998	8	8.8
1999	17	8.8
2000	9	16.2
2001	21	16.2
2002	14	16.2
2004	5	16.2
2005	22	16.2
2006	25	16.2
2007	34	16.2
2008	6	16.2
2009	10	16.2

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

First to last qualifying date each year at Danbury
Year	First date	Last date
1922	1922-05-10	1922-09-10
1924	1924-06-14	1924-08-30
1925	1925-05-19	1925-09-17
1926	1926-05-01	1926-09-17
1927	1927-06-29	1927-09-14
1928	1928-07-04	1928-10-10
1929	1929-05-28	1929-09-04
1930	1930-05-21	1930-09-24
1931	1931-05-15	1931-09-20
1932	1932-05-13	1932-09-11
1933	1933-05-17	1933-09-30
1934	1934-04-30	1934-08-21
1936	1936-05-16	1936-09-21
1937	1937-05-30	1937-09-23
1938	1938-06-21	1938-09-23
1939	1939-05-05	1939-09-15
1940	1940-05-12	1940-09-19
1943	1943-06-15	1943-09-01
1944	1944-05-29	1944-08-13
1947	1947-06-21	1947-10-21
1948	1948-05-20	1948-09-18
1949	1949-05-01	1949-08-27
1951	1951-07-07	1951-07-30
1952	1952-04-27	1952-09-13
1953	1953-05-07	1953-10-02
1954	1954-06-09	1954-08-24
1955	1955-05-02	1955-09-18
1956	1956-05-26	1956-08-28
1957	1957-07-02	1957-09-01
1958	1958-05-29	1958-08-29
1959	1959-05-01	1959-09-08
1960	1960-07-08	1960-09-06
1961	1961-06-09	1961-09-10
1962	1962-04-25	1962-08-27
1963	1963-05-07	1963-08-08
1964	1964-05-18	1964-08-06
1965	1965-06-27	1965-08-14
1966	1966-05-26	1966-08-31
1967	1967-07-20	1967-07-31
1968	1968-06-04	1968-08-24
1969	1969-05-27	1969-09-15
1970	1970-04-29	1970-09-07
1971	1971-06-06	1971-09-03
1972	1972-05-17	1972-08-17
1973	1973-06-09	1973-08-28
1974	1974-07-02	1974-08-20
1975	1975-05-20	1975-08-24
1976	1976-06-06	1976-09-12
1977	1977-05-12	1977-07-24
1978	1978-05-25	1978-09-10
1979	1979-06-14	1979-08-31
1980	1980-04-21	1980-08-06
1981	1981-07-05	1981-08-13
1982	1982-07-04	1982-08-18
1983	1983-06-25	1983-09-03
1984	1984-06-26	1984-09-19
1985	1985-06-08	1985-08-07
1986	1986-05-29	1986-08-16
1987	1987-04-19	1987-08-16
1988	1988-05-30	1988-08-17
1989	1989-06-20	1989-08-12
1990	1990-06-26	1990-08-28
1991	1991-05-15	1991-08-30
1992	1992-05-02	1992-10-03
1993	1993-06-22	1993-08-27
1994	1994-06-15	1994-08-26
1995	1995-06-17	1995-08-31
1996	1996-06-13	1996-08-07
1997	1997-06-23	1997-08-03
1998	1998-05-15	1998-09-20
1999	1999-06-26	1999-09-04
2000	2000-05-05	2000-09-19
2001	2001-05-16	2001-08-23
2002	2002-04-16	2002-08-01
2004	2004-06-08	2004-09-03
2005	2005-06-24	2005-09-12
2006	2006-05-29	2006-08-05
2007	2007-05-11	2007-09-07
2008	2008-07-02	2008-09-02
2009	2009-05-21	2009-08-15

Every Fixed Threshold

Fixed thresholds at Danbury
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	80	80	1933	10
35 C (95 F): Days	35	16	1931	3
40 C (104 F): Days	4	4	1936	3
90 F (32.2 C): Days	75	46	1933	4
100 F (37.8 C): Days	10	9	1936	2
0 C (32 F): Ice days (max	80	108	1972	85
0 C (32 F): Frost days (min	81	208	1929	170
-10 C (14 F): Days with min	81	123	1955	82
-20 C (-4 F): Days with min	81	64	1955	45
-30 C (-22 F): Days with min	78	23	1936	9
-40 C (-40 F): Days with min	18	3	1996	3
20 C (68 F): Tropical nights (min	75	13	1988	2
25 C (77 F): Days with min	12	2	1936	2
10 mm (0.39 in): Days with 10 mm or more rain	79	37	1986	27
25 mm (0.98 in): Days with 25 mm or more rain	79	12	1928	7
50 mm (1.97 in): Days with 50 mm or more rain	49	3	1953	1
100 mm (3.94 in): Days with 100 mm or more rain	6	1	1953	1
10 cm (3.9 in): Days with 10 cm or more snowfall	65	9	1926	1
25 cm (9.8 in): Days with 25 cm or more snowfall	17	3	1953	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1922.

Download the Data

Data for Danbury 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 2026-10-16 (16 October 2026). Threshold counts are computed by this site.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Danbury Threshold Days by Year

Key Facts for Danbury Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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