Hillsboro Threshold Days by Year (USC00333758)

18 fixed thresholds counted per year at Hillsboro (USC00333758): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Hillsboro Thresholds

Hillsboro: days with a maximum temperature at or above 30 C (86 F) in 130 years, most in 1895 with 105.
Hillsboro: days with a maximum temperature at or below 0 C (32 F) in 130 years, most in 1978 with 51.
Hillsboro: nights with a minimum temperature at or below 0 C (32 F) in 129 years, most in 1895 with 161.
Hillsboro: nights with a minimum temperature at or below -10 C (14 F) in 129 years, most in 1963 with 50.
18 fixed thresholds have at least one qualifying day at Hillsboro.

Days at or above 30 C (86 F)

130 years with a qualifying day

Days per year at Hillsboro with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 105 in 1895.

Days at or above 30 C (86 F) per year at Hillsboro
Year	Days	Decade average
1893	75	86.6
1894	100	86.6
1895	105	86.6
1896	86	86.6
1897	83	86.6
1898	97	86.6
1899	60	86.6
1900	65	47.6
1901	49	47.6
1902	52	47.6
1903	55	47.6
1904	46	47.6
1905	40	47.6
1906	54	47.6
1907	43	47.6
1908	55	47.6
1909	17	47.6
1910	22	52.3
1911	78	52.3
1912	40	52.3
1913	61	52.3
1914	67	52.3
1915	26	52.3
1916	52	52.3
1917	29	52.3
1918	51	52.3
1919	97	52.3
1920	56	39.3
1921	64	39.3
1922	49	39.3
1923	47	39.3
1924	21	39.3
1925	57	39.3
1926	23	39.3
1927	24	39.3
1928	33	39.3
1929	19	39.3
1930	58	41.3
1931	51	41.3
1932	38	41.3
1933	38	41.3
1934	46	41.3
1935	25	41.3
1936	71	41.3
1937	38	41.3
1938	18	41.3
1939	30	41.3
1940	31	56.7
1941	33	56.7
1942	49	56.7
1943	39	56.7
1944	84	56.7
1945	60	56.7
1946	53	56.7
1947	62	56.7
1948	74	56.7
1949	82	56.7
1950	30	47.4
1951	56	47.4
1952	64	47.4
1953	74	47.4
1954	51	47.4
1955	56	47.4
1956	28	47.4
1957	38	47.4
1958	20	47.4
1959	57	47.4
1960	32	33.8
1961	31	33.8
1962	39	33.8
1963	26	33.8
1964	53	33.8
1965	32	33.8
1966	38	33.8
1967	18	33.8
1968	41	33.8
1969	28	33.8
1970	43	25.8
1971	21	25.8
1972	20	25.8
1973	24	25.8
1974	10	25.8
1975	39	25.8
1976	21	25.8
1977	34	25.8
1978	35	25.8
1979	11	25.8
1980	41	34
1981	20	34
1982	26	34
1983	63	34
1984	31	34
1985	18	34
1986	30	34
1987	43	34
1988	51	34
1989	17	34
1990	19	24.4
1991	33	24.4
1992	5	24.4
1993	35	24.4
1994	20	24.4
1995	33	24.4
1996	16	24.4
1997	18	24.4
1998	21	24.4
1999	44	24.4
2000	8	20.3
2001	17	20.3
2002	48	20.3
2003	10	20.3
2004	7	20.3
2005	30	20.3
2006	22	20.3
2011	51	45.1
2012	53	45.1
2013	28	45.1
2014	29	45.1
2015	32	45.1
2016	59	45.1
2017	36	45.1
2018	66	45.1
2019	52	45.1
2020	50	49.7
2021	47	49.7
2022	46	49.7
2023	34	49.7
2024	71	49.7
2025	53	49.7
2026	47	49.7

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

First to last qualifying date each year at Hillsboro
Year	First date	Last date
1893	1893-04-07	1893-10-11
1894	1894-04-28	1894-10-23
1895	1895-04-25	1895-09-25
1896	1896-04-12	1896-09-26
1897	1897-04-28	1897-10-16
1898	1898-05-01	1898-10-03
1899	1899-04-30	1899-10-14
1900	1900-05-14	1900-10-05
1901	1901-06-11	1901-09-07
1902	1902-05-03	1902-09-23
1903	1903-05-17	1903-10-03
1904	1904-05-25	1904-10-10
1905	1905-05-04	1905-09-29
1906	1906-05-15	1906-09-19
1907	1907-06-17	1907-09-20
1908	1908-05-25	1908-09-26
1909	1909-06-07	1909-09-14
1910	1910-06-17	1910-10-03
1911	1911-05-11	1911-09-27
1912	1912-05-21	1912-09-14
1913	1913-06-06	1913-10-10
1914	1914-05-25	1914-09-22
1915	1915-04-26	1915-09-19
1916	1916-05-14	1916-10-08
1917	1917-06-13	1917-09-03
1918	1918-05-22	1918-08-25
1919	1919-05-28	1919-10-14
1920	1920-06-09	1920-10-25
1921	1921-05-19	1921-09-20
1922	1922-06-07	1922-10-06
1923	1923-05-31	1923-08-21
1924	1924-06-13	1924-09-01
1925	1925-04-24	1925-09-20
1926	1926-05-07	1926-08-12
1927	1927-05-21	1927-10-06
1928	1928-05-04	1928-10-13
1929	1929-05-29	1929-09-28
1930	1930-04-11	1930-09-24
1931	1931-05-29	1931-09-22
1932	1932-06-03	1932-09-19
1933	1933-06-06	1933-09-11
1934	1934-05-20	1934-08-14
1935	1935-06-30	1935-09-18
1936	1936-05-09	1936-09-23
1937	1937-05-31	1937-09-04
1938	1938-06-11	1938-09-06
1939	1939-05-25	1939-10-10
1940	1940-05-08	1940-09-21
1941	1941-05-21	1941-10-07
1942	1942-05-30	1942-09-14
1943	1943-05-06	1943-09-06
1944	1944-05-12	1944-09-20
1945	1945-05-21	1945-09-28
1946	1946-04-22	1946-10-05
1947	1947-06-05	1947-10-23
1948	1948-04-24	1948-09-20
1949	1949-05-03	1949-10-11
1950	1950-05-05	1950-09-01
1951	1951-05-01	1951-10-05
1952	1952-05-05	1952-10-01
1953	1953-05-25	1953-10-20
1954	1954-05-31	1954-10-05
1955	1955-06-18	1955-09-21
1956	1956-05-13	1956-09-13
1957	1957-05-13	1957-09-03
1958	1958-06-05	1958-09-26
1959	1959-05-02	1959-10-05
1960	1960-06-04	1960-09-09
1961	1961-06-12	1961-09-25
1962	1962-05-14	1962-09-14
1963	1963-05-10	1963-09-04
1964	1964-05-20	1964-09-17
1965	1965-05-09	1965-09-20
1966	1966-05-24	1966-09-02
1967	1967-05-28	1967-09-19
1968	1968-06-07	1968-09-23
1969	1969-05-07	1969-09-07
1970	1970-06-10	1970-09-25
1971	1971-06-05	1971-10-04
1972	1972-05-26	1972-09-14
1973	1973-06-10	1973-09-06
1974	1974-05-18	1974-08-28
1975	1975-05-21	1975-09-05
1976	1976-06-08	1976-09-14
1977	1977-05-16	1977-09-04
1978	1978-05-27	1978-09-21
1979	1979-05-11	1979-09-04
1980	1980-06-06	1980-09-21
1981	1981-06-14	1981-08-31
1982	1982-05-12	1982-09-15
1983	1983-06-12	1983-09-20
1984	1984-06-08	1984-09-22
1985	1985-06-09	1985-09-11
1986	1986-04-27	1986-10-01
1987	1987-05-21	1987-08-28
1988	1988-05-31	1988-08-19
1989	1989-06-02	1989-08-06
1990	1990-04-28	1990-09-07
1991	1991-06-01	1991-09-17
1992	1992-07-10	1992-08-11
1993	1993-06-19	1993-09-15
1994	1994-06-14	1994-08-14
1995	1995-06-20	1995-09-01
1996	1996-05-19	1996-08-24
1997	1997-06-24	1997-09-03
1998	1998-06-23	1998-09-28
1999	1999-06-07	1999-09-13
2000	2000-06-11	2000-08-10
2001	2001-06-13	2001-08-10
2002	2002-06-05	2002-09-11
2003	2003-07-04	2003-08-27
2004	2004-07-06	2004-08-29
2005	2005-06-06	2005-08-21
2006	2006-05-30	2006-08-27
2011	2011-05-12	2011-09-04
2012	2012-05-03	2012-09-08
2013	2013-05-16	2013-09-21
2014	2014-05-13	2014-10-03
2015	2015-05-08	2015-09-09
2016	2016-05-28	2016-09-24
2017	2017-05-18	2017-09-28
2018	2018-05-12	2018-10-09
2019	2019-05-19	2019-10-04
2020	2020-05-26	2020-09-13
2021	2021-05-21	2021-09-20
2022	2022-05-21	2022-09-22
2023	2023-06-02	2023-10-05
2024	2024-05-03	2024-10-07
2025	2025-06-04	2025-09-30
2026	2026-03-23	2026-10-02

Every Fixed Threshold

Fixed thresholds at Hillsboro
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	130	105	1895	47
35 C (95 F): Days	55	44	1894	1
40 C (104 F): Days	3	3	1895	1
90 F (32.2 C): Days	122	82	1895	18
100 F (37.8 C): Days	20	15	1895	2
0 C (32 F): Ice days (max	130	51	1978	26
0 C (32 F): Frost days (min	129	161	1895	75
-10 C (14 F): Days with min	129	50	1963	20
-20 C (-4 F): Days with min	79	14	1963	9
-30 C (-22 F): Days with min	4	3	1994	3
20 C (68 F): Tropical nights (min	129	43	1980	31
25 C (77 F): Days with min	8	2	1977	1
10 mm (0.39 in): Days with 10 mm or more rain	124	55	2011	31
25 mm (0.98 in): Days with 25 mm or more rain	124	18	2011	11
50 mm (1.97 in): Days with 50 mm or more rain	97	6	2000	3
100 mm (3.94 in): Days with 100 mm or more rain	8	1	1922	1
10 cm (3.9 in): Days with 10 cm or more snowfall	81	5	1926	2
25 cm (9.8 in): Days with 25 cm or more snowfall	7	2	1910	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1893.

Download the Data

Data for Hillsboro 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).

Hillsboro Threshold Days by Year (USC00333758)

Key Facts for Hillsboro Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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