Dayton 2SE Threshold Days by Year (USC00402360)

16 fixed thresholds counted per year at Dayton 2SE (USC00402360): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Dayton 2SE Thresholds

Dayton 2SE: days with 10 mm (0.39 in) or more of precipitation in 66 years, most in 1989 with 65.
Dayton 2SE: days with 25 mm (0.98 in) or more of precipitation in 66 years, most in 1994 with 27.
Dayton 2SE: days with a maximum temperature at or above 30 C (86 F) in 65 years, most in 1980 with 114.
Dayton 2SE: days with a maximum temperature at or above 90 F (32.2 C) in 64 years, most in 1980 with 87.
16 fixed thresholds have at least one qualifying day at Dayton 2SE.

Days at or above 30 C (86 F)

65 years with a qualifying day

Days per year at Dayton 2SE with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 114 in 1980.

Days at or above 30 C (86 F) per year at Dayton 2SE
Year	Days	Decade average
1957	81	83.7
1958	92	83.7
1959	78	83.7
1960	83	85.8
1962	96	85.8
1963	72	85.8
1964	85	85.8
1965	92	85.8
1966	81	85.8
1967	67	85.8
1968	97	85.8
1969	99	85.8
1970	104	85.6
1971	95	85.6
1972	85	85.6
1973	86	85.6
1974	69	85.6
1975	88	85.6
1976	66	85.6
1977	112	85.6
1978	95	85.6
1979	56	85.6
1980	114	83.8
1981	92	83.8
1982	84	83.8
1983	87	83.8
1984	77	83.8
1985	69	83.8
1986	107	83.8
1987	93	83.8
1988	79	83.8
1989	36	83.8
1990	63	51.5
1991	60	51.5
1992	14	51.5
1993	76	51.5
1994	23	51.5
1995	58	51.5
1996	45	51.5
1999	73	51.5
2000	77	70.8
2001	60	70.8
2002	99	70.8
2003	42	70.8
2004	55	70.8
2005	65	70.8
2006	71	70.8
2007	93	70.8
2008	84	70.8
2009	62	70.8
2010	106	81.5
2011	94	81.5
2012	71	81.5
2013	33	81.5
2016	106	81.5
2017	61	81.5
2018	83	81.5
2019	98	81.5
2020	64	64.1
2021	46	64.1
2022	72	64.1
2023	46	64.1
2024	71	64.1
2025	64	64.1
2026	86	64.1

For each year, a bar from the first to the last day at Dayton 2SE meeting 30 C (86 F).

First to last qualifying date each year at Dayton 2SE
Year	First date	Last date
1957	1957-04-28	1957-09-22
1958	1958-05-16	1958-09-26
1959	1959-05-02	1959-10-05
1960	1960-04-23	1960-09-22
1962	1962-04-30	1962-09-15
1963	1963-04-21	1963-10-21
1964	1964-04-20	1964-09-22
1965	1965-04-23	1965-09-22
1966	1966-05-07	1966-09-05
1967	1967-04-05	1967-10-07
1968	1968-05-15	1968-09-24
1969	1969-05-05	1969-09-18
1970	1970-04-30	1970-09-26
1971	1971-06-01	1971-10-04
1972	1972-04-14	1972-09-20
1973	1973-05-10	1973-09-25
1974	1974-04-27	1974-09-13
1975	1975-04-28	1975-09-10
1976	1976-04-19	1976-09-19
1977	1977-04-10	1977-10-01
1978	1978-04-08	1978-09-21
1979	1979-05-11	1979-09-12
1980	1980-04-22	1980-10-10
1981	1981-04-14	1981-10-01
1982	1982-05-11	1982-09-17
1983	1983-06-10	1983-10-04
1984	1984-04-25	1984-09-25
1985	1985-04-20	1985-09-11
1986	1986-04-25	1986-10-04
1987	1987-04-21	1987-09-17
1988	1988-04-05	1988-09-23
1989	1989-04-25	1989-09-09
1990	1990-06-08	1990-09-20
1991	1991-05-18	1991-09-19
1992	1992-06-07	1992-08-10
1993	1993-05-29	1993-09-22
1994	1994-06-01	1994-08-31
1995	1995-04-10	1995-09-09
1996	1996-05-05	1996-09-06
1999	1999-04-04	1999-09-29
2000	2000-05-13	2000-09-21
2001	2001-04-11	2001-09-13
2002	2002-04-17	2002-10-03
2003	2003-05-11	2003-09-22
2004	2004-05-09	2004-09-07
2005	2005-05-13	2005-09-26
2006	2006-04-14	2006-09-02
2007	2007-05-02	2007-10-08
2008	2008-06-01	2008-09-13
2009	2009-04-25	2009-09-26
2010	2010-04-06	2010-10-12
2011	2011-04-10	2011-09-15
2012	2012-05-01	2012-09-08
2013	2013-05-16	2013-09-10
2016	2016-05-09	2016-10-21
2017	2017-04-30	2017-10-11
2018	2018-05-12	2018-10-09
2019	2019-05-18	2019-10-06
2020	2020-06-07	2020-09-15
2021	2021-05-24	2021-09-15
2022	2022-05-20	2022-09-22
2023	2023-04-06	2023-09-13
2024	2024-06-14	2024-09-25
2025	2025-04-05	2025-09-21
2026	2026-05-18	2026-10-02

Every Fixed Threshold

Fixed thresholds at Dayton 2SE
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	65	114	1980	86
35 C (95 F): Days	47	53	1980	9
40 C (104 F): Days	2	4	1980	2
90 F (32.2 C): Days	64	87	1980	44
100 F (37.8 C): Days	12	16	1980	5
0 C (32 F): Ice days (max	59	15	2010	3
0 C (32 F): Frost days (min	62	106	1968	50
-10 C (14 F): Days with min	58	29	1977	5
-20 C (-4 F): Days with min	9	2	1966	1
20 C (68 F): Tropical nights (min	62	85	2018	60
25 C (77 F): Days with min	6	2	1980	1
10 mm (0.39 in): Days with 10 mm or more rain	66	65	1989	29
25 mm (0.98 in): Days with 25 mm or more rain	66	27	1994	12
50 mm (1.97 in): Days with 50 mm or more rain	64	11	2018	3
100 mm (3.94 in): Days with 100 mm or more rain	15	2	1963	2
10 cm (3.9 in): Days with 10 cm or more snowfall	10	2	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 1957.

Download the Data

Data for Dayton 2SE 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).

Dayton 2SE Threshold Days by Year (USC00402360)

Key Facts for Dayton 2SE Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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