Dillon AP Threshold Days by Year (USW00024138)

15 fixed thresholds counted per year at Dillon AP (USW00024138): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Dillon AP Thresholds

Dillon AP: days with a maximum temperature at or above 30 C (86 F) in 80 years, most in 2003 with 53.
Dillon AP: days with a maximum temperature at or above 90 F (32.2 C) in 80 years, most in 2003 with 31.
Dillon AP: days with a maximum temperature at or below 0 C (32 F) in 80 years, most in 1952 with 76.
Dillon AP: nights with a minimum temperature at or below 0 C (32 F) in 80 years, most in 1984 with 219.
15 fixed thresholds have at least one qualifying day at Dillon AP.

Days at or above 30 C (86 F)

80 years with a qualifying day

Days per year at Dillon AP with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 53 in 2003.

Days at or above 30 C (86 F) per year at Dillon AP
Year	Days	Decade average
1941	20	23.9
1942	31	23.9
1943	26	23.9
1944	11	23.9
1945	26	23.9
1946	27	23.9
1947	26	23.9
1948	19	23.9
1949	29	23.9
1950	21	33.9
1951	25	33.9
1952	28	33.9
1953	42	33.9
1954	34	33.9
1955	43	33.9
1956	29	33.9
1957	39	33.9
1958	33	33.9
1959	45	33.9
1960	36	31.4
1961	44	31.4
1962	15	31.4
1963	32	31.4
1964	23	31.4
1965	13	31.4
1966	50	31.4
1967	33	31.4
1968	29	31.4
1969	39	31.4
1970	46	27.2
1971	36	27.2
1972	25	27.2
1973	27	27.2
1974	30	27.2
1975	17	27.2
1976	20	27.2
1977	23	27.2
1978	21	27.2
1979	27	27.2
1980	13	22.9
1981	26	22.9
1982	21	22.9
1983	9	22.9
1984	14	22.9
1985	31	22.9
1986	28	22.9
1987	16	22.9
1988	49	22.9
1989	22	22.9
1990	32	30.8
1991	40	30.8
1998	30	30.8
1999	21	30.8
2000	33	31.6
2001	33	31.6
2002	20	31.6
2003	53	31.6
2004	18	31.6
2005	30	31.6
2006	35	31.6
2007	45	31.6
2008	24	31.6
2009	25	31.6
2010	13	30.7
2011	24	30.7
2012	42	30.7
2013	39	30.7
2014	26	30.7
2015	32	30.7
2016	34	30.7
2017	46	30.7
2018	27	30.7
2019	24	30.7
2020	27	33
2021	47	33
2022	46	33
2023	22	33
2024	29	33
2025	23	33
2026	37	33

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

First to last qualifying date each year at Dillon AP
Year	First date	Last date
1941	1941-06-12	1941-08-16
1942	1942-07-03	1942-09-08
1943	1943-07-06	1943-08-29
1944	1944-06-30	1944-09-07
1945	1945-06-21	1945-09-04
1946	1946-07-01	1946-09-14
1947	1947-07-02	1947-09-05
1948	1948-06-29	1948-09-14
1949	1949-06-10	1949-09-01
1950	1950-06-29	1950-09-06
1951	1951-06-15	1951-08-19
1952	1952-06-05	1952-09-26
1953	1953-06-11	1953-09-15
1954	1954-05-18	1954-09-01
1955	1955-06-21	1955-09-08
1956	1956-06-08	1956-09-19
1957	1957-06-02	1957-09-07
1958	1958-05-20	1958-09-11
1959	1959-06-12	1959-09-11
1960	1960-06-24	1960-08-30
1961	1961-06-08	1961-08-22
1962	1962-06-25	1962-08-26
1963	1963-07-02	1963-09-29
1964	1964-07-07	1964-08-18
1965	1965-07-06	1965-08-12
1966	1966-05-05	1966-09-23
1967	1967-07-02	1967-09-21
1968	1968-06-02	1968-09-10
1969	1969-06-04	1969-09-02
1970	1970-06-06	1970-08-29
1971	1971-06-22	1971-08-28
1972	1972-05-31	1972-08-28
1973	1973-06-06	1973-08-20
1974	1974-06-12	1974-09-04
1975	1975-07-02	1975-08-06
1976	1976-06-29	1976-09-05
1977	1977-06-01	1977-09-07
1978	1978-06-28	1978-09-04
1979	1979-06-12	1979-09-18
1980	1980-07-21	1980-09-06
1981	1981-06-26	1981-09-18
1982	1982-07-19	1982-09-09
1983	1983-07-07	1983-09-01
1984	1984-06-28	1984-09-18
1985	1985-06-07	1985-08-29
1986	1986-05-27	1986-08-28
1987	1987-06-13	1987-09-23
1988	1988-06-04	1988-09-09
1989	1989-06-19	1989-08-14
1990	1990-06-23	1990-09-12
1991	1991-06-11	1991-09-06
1998	1998-07-13	1998-09-16
1999	1999-07-06	1999-08-30
2000	2000-06-05	2000-09-15
2001	2001-06-27	2001-09-25
2002	2002-06-25	2002-09-04
2003	2003-05-28	2003-09-04
2004	2004-07-11	2004-09-11
2005	2005-06-22	2005-09-08
2006	2006-06-28	2006-09-05
2007	2007-06-21	2007-09-03
2008	2008-06-21	2008-08-25
2009	2009-05-18	2009-09-24
2010	2010-06-28	2010-10-03
2011	2011-06-28	2011-08-28
2012	2012-06-04	2012-09-14
2013	2013-05-13	2013-09-06
2014	2014-07-02	2014-09-24
2015	2015-06-08	2015-09-25
2016	2016-06-05	2016-09-01
2017	2017-06-04	2017-09-11
2018	2018-07-05	2018-08-17
2019	2019-07-10	2019-09-05
2020	2020-05-30	2020-09-06
2021	2021-06-03	2021-09-09
2022	2022-06-17	2022-09-07
2023	2023-07-09	2023-08-29
2024	2024-06-22	2024-09-07
2025	2025-05-31	2025-09-03
2026	2026-05-28	2026-08-27

Every Fixed Threshold

Fixed thresholds at Dillon AP
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	80	53	2003	37
35 C (95 F): Days	55	12	2003	2
90 F (32.2 C): Days	80	31	2003	14
100 F (37.8 C): Days	3	1	1960	1
0 C (32 F): Ice days (max	80	76	1952	10
0 C (32 F): Frost days (min	80	219	1984	111
-10 C (14 F): Days with min	80	104	1955	16
-20 C (-4 F): Days with min	79	29	1949	10
-30 C (-22 F): Days with min	42	8	1949	4
-40 C (-40 F): Days with min	1	1	2024	1
10 mm (0.39 in): Days with 10 mm or more rain	78	13	1987	4
25 mm (0.98 in): Days with 25 mm or more rain	21	2	1975	1
50 mm (1.97 in): Days with 50 mm or more rain	1	1	1958	1
10 cm (3.9 in): Days with 10 cm or more snowfall	45	10	1989	9
25 cm (9.8 in): Days with 25 cm or more snowfall	2	1	1957	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1941.

Download the Data

Data for Dillon 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).

Dillon AP Threshold Days by Year (USW00024138)

Key Facts for Dillon AP Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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