De Bilt Threshold Days by Year (NLM00006260)

11 fixed thresholds counted per year at De Bilt (NLM00006260): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for De Bilt Thresholds

De Bilt: nights with a minimum temperature at or below 0 C (32 F) in 126 years, most in 1929 with 103.
De Bilt: days with 10 mm (0.39 in) or more of precipitation in 121 years, most in 1998 with 45.
De Bilt: days with a maximum temperature at or below 0 C (32 F) in 119 years, most in 1942 with 48.
De Bilt: days with 25 mm (0.98 in) or more of precipitation in 104 years, most in 1965 with 7.
11 fixed thresholds have at least one qualifying day at De Bilt.

Days at or above 30 C (86 F)

95 years with a qualifying day

Days per year at De Bilt with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 14 in 1976.

Days at or above 30 C (86 F) per year at De Bilt
Year	Days	Decade average
1901	2	1.8
1902	2	1.8
1903	1	1.8
1904	2	1.8
1910	1	3.1
1911	11	3.1
1912	2	3.1
1915	1	3.1
1917	2	3.1
1918	1	3.1
1919	4	3.1
1921	5	3.1
1922	3	3.1
1923	8	3.1
1925	2	3.1
1926	1	3.1
1928	1	3.1
1929	2	3.1
1930	4	2.4
1932	3	2.4
1933	1	2.4
1934	1	2.4
1935	3	2.4
1936	4	2.4
1937	2	2.4
1938	2	2.4
1939	2	2.4
1941	10	5.4
1942	3	5.4
1944	5	5.4
1945	2	5.4
1946	1	5.4
1947	13	5.4
1948	7	5.4
1949	2	5.4
1950	3	2.8
1952	1	2.8
1953	1	2.8
1955	2	2.8
1957	6	2.8
1959	4	2.8
1961	3	3
1964	4	3
1966	1	3
1967	3	3
1968	2	3
1969	5	3
1972	2	4.8
1973	2	4.8
1975	8	4.8
1976	14	4.8
1977	1	4.8
1978	2	4.8
1982	6	3.7
1983	7	3.7
1984	2	3.7
1985	1	3.7
1986	3	3.7
1989	3	3.7
1990	3	5.1
1991	4	5.1
1992	3	5.1
1994	9	5.1
1995	11	5.1
1996	2	5.1
1997	6	5.1
1998	5	5.1
1999	3	5.1
2000	2	4.6
2001	6	4.6
2002	4	4.6
2003	11	4.6
2004	3	4.6
2005	4	4.6
2006	13	4.6
2007	1	4.6
2008	1	4.6
2009	1	4.6
2010	3	4.9
2011	2	4.9
2012	2	4.9
2013	7	4.9
2014	2	4.9
2015	5	4.9
2016	5	4.9
2017	3	4.9
2018	9	4.9
2019	11	4.9
2020	12	7.4
2021	1	7.4
2022	9	7.4
2023	5	7.4
2024	4	7.4
2025	8	7.4
2026	13	7.4

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

First to last qualifying date each year at De Bilt
Year	First date	Last date
1901	1901-07-12	1901-08-10
1902	1902-06-03	1902-06-29
1903	1903-09-02	1903-09-02
1904	1904-07-15	1904-08-04
1910	1910-06-06	1910-06-06
1911	1911-07-22	1911-09-08
1912	1912-07-12	1912-07-13
1915	1915-06-08	1915-06-08
1917	1917-06-16	1917-06-17
1918	1918-08-22	1918-08-22
1919	1919-06-12	1919-09-13
1921	1921-07-10	1921-08-02
1922	1922-05-22	1922-05-24
1923	1923-07-06	1923-08-09
1925	1925-07-21	1925-07-22
1926	1926-07-14	1926-07-14
1928	1928-07-15	1928-07-15
1929	1929-07-17	1929-07-20
1930	1930-07-01	1930-08-29
1932	1932-07-12	1932-08-20
1933	1933-07-27	1933-07-27
1934	1934-07-18	1934-07-18
1935	1935-06-24	1935-08-23
1936	1936-06-18	1936-06-21
1937	1937-06-10	1937-08-07
1938	1938-08-02	1938-08-04
1939	1939-06-06	1939-06-07
1941	1941-06-22	1941-07-13
1942	1942-07-05	1942-08-29
1944	1944-05-29	1944-08-24
1945	1945-07-14	1945-07-15
1946	1946-07-04	1946-07-04
1947	1947-06-01	1947-08-18
1948	1948-06-11	1948-07-30
1949	1949-07-13	1949-09-05
1950	1950-06-05	1950-06-07
1952	1952-07-06	1952-07-06
1953	1953-08-12	1953-08-12
1955	1955-07-17	1955-08-22
1957	1957-06-17	1957-07-06
1959	1959-07-08	1959-07-18
1961	1961-07-01	1961-08-30
1964	1964-06-13	1964-08-27
1966	1966-06-10	1966-06-10
1967	1967-07-13	1967-08-01
1968	1968-07-01	1968-07-02
1969	1969-07-16	1969-08-10
1972	1972-07-19	1972-07-20
1973	1973-07-02	1973-07-05
1975	1975-07-08	1975-08-09
1976	1976-05-09	1976-08-25
1977	1977-06-13	1977-06-13
1978	1978-07-30	1978-07-31
1982	1982-07-09	1982-08-04
1983	1983-06-22	1983-08-19
1984	1984-07-30	1984-08-22
1985	1985-07-14	1985-07-14
1986	1986-06-16	1986-07-02
1989	1989-07-06	1989-08-20
1990	1990-08-02	1990-08-04
1991	1991-07-07	1991-09-03
1992	1992-06-30	1992-08-09
1994	1994-07-02	1994-08-04
1995	1995-07-10	1995-08-22
1996	1996-06-06	1996-06-07
1997	1997-08-09	1997-08-25
1998	1998-05-11	1998-08-11
1999	1999-07-31	1999-08-02
2000	2000-06-19	2000-06-20
2001	2001-07-05	2001-08-26
2002	2002-06-17	2002-07-30
2003	2003-07-15	2003-08-12
2004	2004-08-06	2004-08-09
2005	2005-05-27	2005-06-24
2006	2006-06-11	2006-07-26
2007	2007-06-08	2007-06-08
2008	2008-07-02	2008-07-02
2009	2009-08-20	2009-08-20
2010	2010-07-02	2010-07-10
2011	2011-06-27	2011-06-28
2012	2012-08-18	2012-08-19
2013	2013-06-18	2013-09-05
2014	2014-07-18	2014-07-19
2015	2015-06-05	2015-08-03
2016	2016-07-20	2016-09-14
2017	2017-05-27	2017-06-22
2018	2018-05-29	2018-08-07
2019	2019-06-02	2019-08-27
2020	2020-06-26	2020-09-15
2021	2021-06-17	2021-06-17
2022	2022-07-18	2022-08-25
2023	2023-06-11	2023-09-10
2024	2024-06-26	2024-08-13
2025	2025-06-13	2025-08-14
2026	2026-05-26	2026-08-14

Every Fixed Threshold

Fixed thresholds at De Bilt
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	95	14	1976	13
35 C (95 F): Days	9	3	2019	2
90 F (32.2 C): Days	48	6	2020	8
0 C (32 F): Ice days (max	119	48	1942	1
0 C (32 F): Frost days (min	126	103	1929	29
-10 C (14 F): Days with min	75	24	1963	3
-20 C (-4 F): Days with min	3	2	1942	1
20 C (68 F): Tropical nights (min	9	3	2020	3
10 mm (0.39 in): Days with 10 mm or more rain	121	45	1998	13
25 mm (0.98 in): Days with 25 mm or more rain	104	7	1965	3
50 mm (1.97 in): Days with 50 mm or more rain	12	1	1917	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1901.

Download the Data

Data for De Bilt 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 2026-10-13. Last revised 13 October 2026 (2026-10-13).

De Bilt Threshold Days by Year (NLM00006260)

Key Facts for De Bilt Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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