Oak Ridge Atdd Threshold Days by Year (USW00003841)

17 fixed thresholds counted per year at Oak Ridge Atdd (USW00003841): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Oak Ridge Atdd Thresholds

Oak Ridge Atdd: days with a maximum temperature at or above 30 C (86 F) in 76 years, most in 1998 with 122.
Oak Ridge Atdd: days with a maximum temperature at or above 90 F (32.2 C) in 76 years, most in 1998 with 91.
Oak Ridge Atdd: nights with a minimum temperature at or below 0 C (32 F) in 76 years, most in 1976 with 123.
Oak Ridge Atdd: nights with a minimum temperature at or above 20 C (68 F) in 76 years, most in 1991 with 80.
17 fixed thresholds have at least one qualifying day at Oak Ridge Atdd.

Days at or above 30 C (86 F)

76 years with a qualifying day

Days per year at Oak Ridge Atdd with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 122 in 1998.

Days at or above 30 C (86 F) per year at Oak Ridge Atdd
Year	Days	Decade average
1949	52	52
1950	28	81.1
1951	84	81.1
1952	93	81.1
1953	93	81.1
1954	106	81.1
1955	92	81.1
1956	80	81.1
1957	93	81.1
1958	72	81.1
1959	70	81.1
1960	59	59.2
1961	51	59.2
1962	71	59.2
1963	48	59.2
1964	72	59.2
1965	63	59.2
1966	56	59.2
1967	30	59.2
1968	65	59.2
1969	77	59.2
1970	84	59.9
1971	63	59.9
1972	49	59.9
1973	50	59.9
1974	44	59.9
1975	62	59.9
1976	42	59.9
1977	68	59.9
1978	84	59.9
1979	53	59.9
1980	102	78.4
1981	72	78.4
1982	65	78.4
1983	81	78.4
1984	66	78.4
1985	51	78.4
1986	92	78.4
1987	99	78.4
1988	90	78.4
1989	66	78.4
1990	90	87.2
1991	96	87.2
1992	54	87.2
1993	103	87.2
1994	65	87.2
1995	106	87.2
1996	80	87.2
1997	77	87.2
1998	122	87.2
1999	79	87.2
2000	69	76.3
2002	108	76.3
2003	56	76.3
2004	56	76.3
2005	87	76.3
2006	72	76.3
2007	107	76.3
2008	75	76.3
2009	57	76.3
2010	113	83.3
2011	99	83.3
2012	83	83.3
2013	65	83.3
2014	79	83.3
2015	83	83.3
2016	104	83.3
2017	52	83.3
2018	87	83.3
2019	68	83.3
2020	84	61.3
2021	76	61.3
2022	82	61.3
2023	34	61.3
2024	62	61.3
2025	30	61.3

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

First to last qualifying date each year at Oak Ridge Atdd
Year	First date	Last date
1949	1949-05-04	1949-08-27
1950	1950-06-15	1950-09-04
1951	1951-05-01	1951-10-06
1952	1952-05-02	1952-10-01
1953	1953-05-22	1953-10-05
1954	1954-04-15	1954-10-05
1955	1955-04-17	1955-09-23
1956	1956-05-12	1956-09-17
1957	1957-04-24	1957-09-22
1958	1958-05-03	1958-09-23
1959	1959-05-02	1959-10-05
1960	1960-05-18	1960-09-10
1961	1961-06-01	1961-09-30
1962	1962-04-30	1962-09-13
1963	1963-04-03	1963-09-21
1964	1964-04-20	1964-09-20
1965	1965-04-23	1965-09-22
1966	1966-06-07	1966-09-04
1967	1967-04-06	1967-09-20
1968	1968-05-24	1968-09-22
1969	1969-05-05	1969-09-16
1970	1970-04-19	1970-09-26
1971	1971-05-18	1971-09-30
1972	1972-04-15	1972-09-20
1973	1973-06-03	1973-09-10
1974	1974-05-17	1974-08-27
1975	1975-05-21	1975-09-10
1976	1976-04-19	1976-09-09
1977	1977-05-16	1977-09-05
1978	1978-04-09	1978-09-21
1979	1979-05-07	1979-09-11
1980	1980-04-23	1980-09-24
1981	1981-04-27	1981-10-01
1982	1982-05-11	1982-09-15
1983	1983-06-13	1983-09-19
1984	1984-04-25	1984-09-25
1985	1985-04-21	1985-09-10
1986	1986-04-25	1986-10-04
1987	1987-04-20	1987-09-17
1988	1988-04-05	1988-09-23
1989	1989-04-25	1989-09-21
1990	1990-04-24	1990-10-09
1991	1991-04-17	1991-10-28
1992	1992-04-15	1992-09-17
1993	1993-04-14	1993-10-06
1994	1994-04-19	1994-09-16
1995	1995-04-09	1995-10-12
1996	1996-05-05	1996-09-12
1997	1997-05-18	1997-10-12
1998	1998-03-30	1998-10-05
1999	1999-04-09	1999-10-18
2000	2000-05-12	2000-10-03
2002	2002-04-16	2002-10-03
2003	2003-04-30	2003-09-20
2004	2004-05-07	2004-09-24
2005	2005-05-12	2005-10-03
2006	2006-04-14	2006-08-30
2007	2007-03-25	2007-10-08
2008	2008-05-31	2008-09-13
2009	2009-04-24	2009-09-25
2010	2010-04-02	2010-10-11
2011	2011-04-09	2011-09-14
2012	2012-03-20	2012-09-07
2013	2013-04-10	2013-10-05
2014	2014-05-04	2014-09-20
2015	2015-05-05	2015-09-19
2016	2016-05-30	2016-10-20
2017	2017-04-29	2017-09-27
2018	2018-05-11	2018-10-08
2019	2019-05-22	2019-10-05
2020	2020-05-16	2020-09-14
2021	2021-05-21	2021-09-16
2022	2022-05-11	2022-09-21
2023	2023-04-05	2023-09-12
2024	2024-06-13	2024-09-24
2025	2025-04-04	2025-07-31

Every Fixed Threshold

Fixed thresholds at Oak Ridge Atdd
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	76	122	1998	30
35 C (95 F): Days	48	36	1995	5
40 C (104 F): Days	2	2	2012	2
90 F (32.2 C): Days	76	91	1998	18
100 F (37.8 C): Days	12	8	1954	4
0 C (32 F): Ice days (max	70	18	1977	7
0 C (32 F): Frost days (min	76	123	1976	41
-10 C (14 F): Days with min	69	33	1977	4
-20 C (-4 F): Days with min	8	2	1966	2
20 C (68 F): Tropical nights (min	76	80	1991	30
25 C (77 F): Days with min	4	2	2022	2
10 mm (0.39 in): Days with 10 mm or more rain	76	63	1989	26
25 mm (0.98 in): Days with 25 mm or more rain	76	29	2003	9
50 mm (1.97 in): Days with 50 mm or more rain	73	9	2003	1
100 mm (3.94 in): Days with 100 mm or more rain	13	2	1967	1
10 cm (3.9 in): Days with 10 cm or more snowfall	18	3	1960	1
25 cm (9.8 in): Days with 25 cm or more snowfall	1	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 1949.

Download the Data

Data for Oak Ridge Atdd 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).

Oak Ridge Atdd Threshold Days by Year (USW00003841)

Key Facts for Oak Ridge Atdd Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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