Dayton Intl AP Threshold Days by Year (USW00093815)

17 fixed thresholds counted per year at Dayton Intl AP (USW00093815): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Dayton Intl AP Thresholds

Dayton Intl AP: days with a maximum temperature at or above 30 C (86 F) in 79 years, most in 1988 with 68.
Dayton Intl AP: days with a maximum temperature at or below 0 C (32 F) in 79 years, most in 2010 with 60.
Dayton Intl AP: nights with a minimum temperature at or below 0 C (32 F) in 79 years, most in 1976 with 141.
Dayton Intl AP: nights with a minimum temperature at or below -10 C (14 F) in 79 years, most in 1978 with 51.
17 fixed thresholds have at least one qualifying day at Dayton Intl AP.

Days at or above 30 C (86 F)

79 years with a qualifying day

Days per year at Dayton Intl AP with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 68 in 1988.

Days at or above 30 C (86 F) per year at Dayton Intl AP
Year	Days	Decade average
1948	40	42.5
1949	45	42.5
1950	15	43.2
1951	36	43.2
1952	52	43.2
1953	65	43.2
1954	58	43.2
1955	61	43.2
1956	23	43.2
1957	35	43.2
1958	23	43.2
1959	64	43.2
1960	39	42.1
1961	36	42.1
1962	46	42.1
1963	28	42.1
1964	59	42.1
1965	52	42.1
1966	54	42.1
1967	37	42.1
1968	35	42.1
1969	35	42.1
1970	46	41.5
1971	26	41.5
1972	41	41.5
1973	53	41.5
1974	42	41.5
1975	43	41.5
1976	30	41.5
1977	63	41.5
1978	44	41.5
1979	27	41.5
1980	56	40
1981	26	40
1982	31	40
1983	54	40
1984	19	40
1985	28	40
1986	32	40
1987	54	40
1988	68	40
1989	32	40
1990	28	41.6
1991	66	41.6
1992	21	41.6
1993	48	41.6
1994	51	41.6
1995	53	41.6
1996	31	41.6
1997	20	41.6
1998	42	41.6
1999	56	41.6
2000	16	31.2
2001	29	31.2
2002	61	31.2
2003	15	31.2
2004	15	31.2
2005	41	31.2
2006	32	31.2
2007	55	31.2
2008	31	31.2
2009	17	31.2
2010	56	48.9
2011	59	48.9
2012	61	48.9
2013	35	48.9
2014	35	48.9
2015	41	48.9
2016	57	48.9
2017	30	48.9
2018	52	48.9
2019	63	48.9
2020	57	51.7
2021	52	51.7
2022	52	51.7
2023	45	51.7
2024	65	51.7
2025	51	51.7
2026	40	51.7

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

First to last qualifying date each year at Dayton Intl AP
Year	First date	Last date
1948	1948-06-03	1948-09-19
1949	1949-05-04	1949-08-27
1950	1950-05-25	1950-08-28
1951	1951-05-01	1951-10-05
1952	1952-05-05	1952-09-13
1953	1953-05-25	1953-10-03
1954	1954-05-31	1954-09-19
1955	1955-06-05	1955-09-19
1956	1956-05-13	1956-09-13
1957	1957-06-15	1957-09-02
1958	1958-06-05	1958-09-06
1959	1959-05-02	1959-10-04
1960	1960-04-23	1960-09-23
1961	1961-06-01	1961-09-24
1962	1962-04-30	1962-09-13
1963	1963-05-09	1963-10-11
1964	1964-05-18	1964-09-21
1965	1965-05-08	1965-09-18
1966	1966-05-23	1966-09-03
1967	1967-05-27	1967-10-04
1968	1968-06-06	1968-08-24
1969	1969-05-06	1969-09-06
1970	1970-05-20	1970-09-23
1971	1971-06-03	1971-10-02
1972	1972-05-25	1972-09-17
1973	1973-06-03	1973-09-28
1974	1974-05-17	1974-08-27
1975	1975-05-19	1975-10-13
1976	1976-06-07	1976-09-08
1977	1977-04-18	1977-09-09
1978	1978-05-27	1978-09-21
1979	1979-05-10	1979-08-31
1980	1980-05-29	1980-09-22
1981	1981-06-08	1981-08-26
1982	1982-05-06	1982-09-02
1983	1983-06-12	1983-09-19
1984	1984-06-08	1984-09-13
1985	1985-04-22	1985-09-09
1986	1986-04-26	1986-09-29
1987	1987-05-14	1987-09-10
1988	1988-05-15	1988-08-25
1989	1989-05-30	1989-09-09
1990	1990-06-08	1990-09-06
1991	1991-05-14	1991-09-16
1992	1992-05-22	1992-08-26
1993	1993-05-09	1993-09-14
1994	1994-05-22	1994-10-01
1995	1995-06-06	1995-09-06
1996	1996-05-18	1996-09-05
1997	1997-06-20	1997-09-02
1998	1998-05-14	1998-09-27
1999	1999-05-30	1999-09-28
2000	2000-06-01	2000-09-02
2001	2001-06-11	2001-08-09
2002	2002-05-31	2002-09-19
2003	2003-06-25	2003-08-28
2004	2004-06-08	2004-09-23
2005	2005-06-05	2005-08-28
2006	2006-05-28	2006-08-26
2007	2007-05-15	2007-10-08
2008	2008-06-05	2008-09-14
2009	2009-05-23	2009-08-17
2010	2010-05-26	2010-10-10
2011	2011-05-11	2011-09-13
2012	2012-03-21	2012-09-06
2013	2013-05-15	2013-09-20
2014	2014-05-12	2014-10-02
2015	2015-05-06	2015-09-08
2016	2016-05-27	2016-09-23
2017	2017-06-03	2017-09-27
2018	2018-05-13	2018-10-08
2019	2019-05-18	2019-10-03
2020	2020-05-24	2020-09-12
2021	2021-05-20	2021-09-27
2022	2022-05-11	2022-09-21
2023	2023-05-29	2023-10-04
2024	2024-05-02	2024-09-22
2025	2025-05-15	2025-09-29
2026	2026-03-22	2026-10-13

Every Fixed Threshold

Fixed thresholds at Dayton Intl AP
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	79	68	1988	40
35 C (95 F): Days	41	19	1988	1
90 F (32.2 C): Days	76	46	1988	14
100 F (37.8 C): Days	7	7	1988	3
0 C (32 F): Ice days (max	79	60	2010	26
0 C (32 F): Frost days (min	79	141	1976	66
-10 C (14 F): Days with min	79	51	1978	20
-20 C (-4 F): Days with min	51	14	1977	4
-30 C (-22 F): Days with min	2	2	1994	2
20 C (68 F): Tropical nights (min	79	52	2025	41
25 C (77 F): Days with min	11	4	2011	1
10 mm (0.39 in): Days with 10 mm or more rain	79	52	1990	36
25 mm (0.98 in): Days with 25 mm or more rain	79	17	1995	13
50 mm (1.97 in): Days with 50 mm or more rain	51	5	2017	3
100 mm (3.94 in): Days with 100 mm or more rain	1	1	1959	1
10 cm (3.9 in): Days with 10 cm or more snowfall	53	6	1951	1
25 cm (9.8 in): Days with 25 cm or more snowfall	5	1	1968	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1948.

Download the Data

Data for Dayton Intl AP 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 Intl AP Threshold Days by Year (USW00093815)

Key Facts for Dayton Intl AP Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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