Hartford Wwtp Threshold Days by Year (USC00473453)

18 fixed thresholds counted per year at Hartford Wwtp (USC00473453): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Hartford Wwtp Thresholds

Hartford Wwtp: days with a maximum temperature at or above 30 C (86 F) in 75 years, most in 1999 with 58.
Hartford Wwtp: days with a maximum temperature at or below 0 C (32 F) in 75 years, most in 2014 with 93.
Hartford Wwtp: nights with a minimum temperature at or below 0 C (32 F) in 74 years, most in 2018 with 186.
Hartford Wwtp: nights with a minimum temperature at or below -10 C (14 F) in 74 years, most in 2014 with 92.
18 fixed thresholds have at least one qualifying day at Hartford Wwtp.

Days at or above 30 C (86 F)

75 years with a qualifying day

Days per year at Hartford Wwtp with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 58 in 1999.

Days at or above 30 C (86 F) per year at Hartford Wwtp
Year	Days	Decade average
1899	47	47
1900	45	45
1954	29	32.7
1955	48	32.7
1956	21	32.7
1957	27	32.7
1958	23	32.7
1959	48	32.7
1960	18	29.3
1961	41	29.3
1962	28	29.3
1963	36	29.3
1964	40	29.3
1965	20	29.3
1966	30	29.3
1967	18	29.3
1968	35	29.3
1969	27	29.3
1970	39	27.7
1971	37	27.7
1972	26	27.7
1973	37	27.7
1974	19	27.7
1975	29	27.7
1976	39	27.7
1977	27	27.7
1978	18	27.7
1979	6	27.7
1980	30	27.1
1981	17	27.1
1982	12	27.1
1983	48	27.1
1984	28	27.1
1985	30	27.1
1986	13	27.1
1987	33	27.1
1988	48	27.1
1989	12	27.1
1990	9	17.1
1991	26	17.1
1992	6	17.1
1993	5	17.1
1994	9	17.1
1995	22	17.1
1996	5	17.1
1997	13	17.1
1998	18	17.1
1999	58	17.1
2000	7	18.4
2001	26	18.4
2002	36	18.4
2003	21	18.4
2004	7	18.4
2005	34	18.4
2006	17	18.4
2007	23	18.4
2008	7	18.4
2009	6	18.4
2010	19	18.1
2011	18	18.1
2012	50	18.1
2013	15	18.1
2014	3	18.1
2015	12	18.1
2016	18	18.1
2017	10	18.1
2018	21	18.1
2019	15	18.1
2020	19	17.6
2021	20	17.6
2022	15	17.6
2023	20	17.6
2024	15	17.6
2025	19	17.6
2026	15	17.6

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

First to last qualifying date each year at Hartford Wwtp
Year	First date	Last date
1899	1899-04-26	1899-09-16
1900	1900-05-12	1900-08-31
1954	1954-06-11	1954-09-07
1955	1955-06-20	1955-09-18
1956	1956-05-22	1956-08-28
1957	1957-06-16	1957-09-01
1958	1958-06-29	1958-09-03
1959	1959-05-02	1959-09-10
1960	1960-07-12	1960-09-09
1961	1961-06-11	1961-09-10
1962	1962-05-16	1962-09-13
1963	1963-06-02	1963-10-06
1964	1964-05-22	1964-09-08
1965	1965-05-25	1965-08-15
1966	1966-06-04	1966-08-31
1967	1967-05-26	1967-08-26
1968	1968-06-05	1968-09-03
1969	1969-05-28	1969-08-31
1970	1970-04-29	1970-09-03
1971	1971-06-04	1971-10-02
1972	1972-05-21	1972-08-31
1973	1973-06-08	1973-09-04
1974	1974-05-21	1974-08-27
1975	1975-05-19	1975-08-24
1976	1976-06-07	1976-09-09
1977	1977-05-16	1977-08-27
1978	1978-05-26	1978-09-10
1979	1979-06-15	1979-08-08
1980	1980-04-22	1980-08-27
1981	1981-06-05	1981-08-14
1982	1982-07-05	1982-10-01
1983	1983-06-21	1983-09-10
1984	1984-06-05	1984-09-24
1985	1985-05-26	1985-09-08
1986	1986-05-31	1986-07-24
1987	1987-05-17	1987-08-15
1988	1988-05-28	1988-09-17
1989	1989-06-22	1989-08-27
1990	1990-06-12	1990-09-06
1991	1991-05-12	1991-09-10
1992	1992-06-12	1992-08-26
1993	1993-08-12	1993-08-27
1994	1994-06-15	1994-09-16
1995	1995-06-17	1995-09-02
1996	1996-05-19	1996-08-07
1997	1997-06-23	1997-10-10
1998	1998-05-19	1998-09-14
1999	1999-05-29	1999-09-08
2000	2000-06-09	2000-09-11
2001	2001-05-16	2001-08-10
2002	2002-04-16	2002-09-10
2003	2003-06-19	2003-09-09
2004	2004-06-08	2004-08-03
2005	2005-06-02	2005-10-04
2006	2006-05-29	2006-08-03
2007	2007-05-15	2007-10-07
2008	2008-06-09	2008-09-03
2009	2009-06-24	2009-08-16
2010	2010-05-24	2010-08-30
2011	2011-05-23	2011-09-02
2012	2012-05-20	2012-09-13
2013	2013-06-24	2013-09-11
2014	2014-06-02	2014-08-23
2015	2015-07-18	2015-09-07
2016	2016-06-11	2016-09-07
2017	2017-06-12	2017-09-26
2018	2018-05-26	2018-09-18
2019	2019-06-28	2019-08-05
2020	2020-05-27	2020-08-28
2021	2021-06-05	2021-08-29
2022	2022-05-11	2022-08-07
2023	2023-05-31	2023-09-06
2024	2024-06-13	2024-09-22
2025	2025-06-21	2025-10-04
2026	2026-05-27	2026-09-03

Every Fixed Threshold

Fixed thresholds at Hartford Wwtp
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	75	58	1999	15
35 C (95 F): Days	30	21	1999	1
40 C (104 F): Days	1	1	1999	1
90 F (32.2 C): Days	68	37	1999	6
100 F (37.8 C): Days	4	4	1988	3
0 C (32 F): Ice days (max	75	93	2014	39
0 C (32 F): Frost days (min	74	186	2018	100
-10 C (14 F): Days with min	74	92	2014	36
-20 C (-4 F): Days with min	74	38	1977	14
-30 C (-22 F): Days with min	27	9	1994	1
20 C (68 F): Tropical nights (min	73	22	1955	6
25 C (77 F): Days with min	1	2	1988	2
10 mm (0.39 in): Days with 10 mm or more rain	74	41	2019	30
25 mm (0.98 in): Days with 25 mm or more rain	73	13	1960	12
50 mm (1.97 in): Days with 50 mm or more rain	51	4	2022	4
100 mm (3.94 in): Days with 100 mm or more rain	6	1	1983	1
10 cm (3.9 in): Days with 10 cm or more snowfall	61	9	1959	1
25 cm (9.8 in): Days with 25 cm or more snowfall	8	1	1959	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1899.

Download the Data

Data for Hartford Wwtp 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Hartford Wwtp Threshold Days by Year (USC00473453)

Key Facts for Hartford Wwtp Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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