Hillsboro Threshold Days by Year (USC00114108)

19 fixed thresholds counted per year at Hillsboro (USC00114108): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Hillsboro Thresholds

Hillsboro: nights with a minimum temperature at or below 0 C (32 F) in 123 years, most in 1962 with 133.
Hillsboro: nights with a minimum temperature at or below -10 C (14 F) in 123 years, most in 1963 with 46.
Hillsboro: nights with a minimum temperature at or above 20 C (68 F) in 123 years, most in 2025 with 56.
Hillsboro: days with 10 mm (0.39 in) or more of precipitation in 118 years, most in 1909 with 51.
19 fixed thresholds have at least one qualifying day at Hillsboro.

Days at or above 30 C (86 F)

102 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 109 in 1991.

Days at or above 30 C (86 F) per year at Hillsboro
Year	Days	Decade average
1897	80	74.7
1898	64	74.7
1899	80	74.7
1900	74	75.2
1901	99	75.2
1902	59	75.2
1903	54	75.2
1904	53	75.2
1905	80	75.2
1906	97	75.2
1907	61	75.2
1908	94	75.2
1909	81	75.2
1910	66	74
1911	102	74
1912	76	74
1913	102	74
1914	81	74
1915	30	74
1916	67	74
1917	52	74
1918	68	74
1919	96	74
1920	67	79.1
1921	95	79.1
1922	102	79.1
1923	71	79.1
1924	69	79.1
1925	96	79.1
1926	87	79.1
1927	59	79.1
1928	68	79.1
1929	77	79.1
1930	93	84.2
1931	98	84.2
1932	88	84.2
1933	99	84.2
1934	88	84.2
1935	62	84.2
1936	97	84.2
1937	78	84.2
1938	81	84.2
1939	58	84.2
1940	59	64.6
1941	91	64.6
1942	58	64.6
1943	68	64.6
1944	89	64.6
1945	42	64.6
1946	54	64.6
1947	65	64.6
1948	57	64.6
1949	63	64.6
1950	31	73
1951	55	73
1952	83	73
1953	102	73
1955	97	73
1956	88	73
1957	59	73
1958	52	73
1959	90	73
1960	64	62.2
1961	70	62.2
1962	68	62.2
1963	75	62.2
1964	77	62.2
1965	51	62.2
1966	61	62.2
1967	35	62.2
1968	61	62.2
1969	60	62.2
1970	65	58.7
1971	70	58.7
1972	65	58.7
1973	48	58.7
1974	37	58.7
1975	58	58.7
1976	47	58.7
1977	64	58.7
1978	74	58.7
1980	90	84.3
1981	71	84.3
1988	102	84.3
1989	74	84.3
1990	79	78
1991	109	78
1992	73	78
1995	65	78
1996	64	78
2007	100	65.3
2008	59	65.3
2009	37	65.3
2014	65	77.4
2016	78	77.4
2017	74	77.4
2018	98	77.4
2019	72	77.4
2020	85	79.8
2022	70	79.8
2025	76	79.8
2026	88	79.8

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
1897	1897-06-10	1897-10-15
1898	1898-05-18	1898-10-03
1899	1899-04-28	1899-10-15
1900	1900-05-14	1900-10-05
1901	1901-04-29	1901-10-01
1902	1902-04-21	1902-09-08
1903	1903-05-16	1903-10-04
1904	1904-05-21	1904-09-30
1905	1905-04-10	1905-10-08
1906	1906-05-01	1906-09-23
1907	1907-03-21	1907-09-19
1908	1908-05-16	1908-10-18
1909	1909-05-06	1909-10-08
1910	1910-03-23	1910-10-16
1911	1911-05-10	1911-10-06
1912	1912-05-22	1912-10-09
1913	1913-05-15	1913-09-18
1914	1914-05-11	1914-09-21
1915	1915-05-14	1915-09-27
1916	1916-05-07	1916-10-08
1917	1917-05-20	1917-09-20
1918	1918-05-26	1918-10-05
1919	1919-05-28	1919-10-02
1920	1920-06-08	1920-10-21
1921	1921-05-20	1921-09-29
1922	1922-05-11	1922-10-06
1923	1923-05-30	1923-09-29
1924	1924-04-24	1924-10-18
1925	1925-04-22	1925-09-29
1926	1926-05-24	1926-10-04
1927	1927-06-10	1927-10-28
1928	1928-05-03	1928-10-12
1929	1929-03-24	1929-09-28
1930	1930-04-10	1930-09-23
1931	1931-05-16	1931-10-06
1932	1932-05-04	1932-09-15
1933	1933-05-19	1933-09-30
1934	1934-05-06	1934-09-25
1935	1935-06-13	1935-09-24
1936	1936-04-20	1936-09-22
1937	1937-04-17	1937-10-05
1938	1938-04-19	1938-10-17
1939	1939-05-23	1939-10-08
1940	1940-05-07	1940-10-25
1941	1941-04-13	1941-10-06
1942	1942-04-30	1942-09-30
1943	1943-05-05	1943-09-05
1944	1944-05-15	1944-10-06
1945	1945-05-31	1945-09-23
1946	1946-04-01	1946-10-06
1947	1947-05-15	1947-10-14
1948	1948-04-07	1948-09-20
1949	1949-05-03	1949-10-08
1950	1950-05-23	1950-10-30
1951	1951-04-28	1951-10-04
1952	1952-04-29	1952-10-01
1953	1953-05-22	1953-10-22
1955	1955-05-03	1955-09-29
1956	1956-05-06	1956-10-02
1957	1957-06-05	1957-09-03
1958	1958-05-15	1958-09-24
1959	1959-04-30	1959-10-04
1960	1960-04-24	1960-09-24
1961	1961-05-31	1961-10-09
1962	1962-04-26	1962-10-12
1963	1963-05-08	1963-10-20
1964	1964-05-17	1964-09-22
1965	1965-04-08	1965-09-19
1966	1966-05-23	1966-09-03
1967	1967-04-09	1967-10-04
1968	1968-05-01	1968-09-23
1969	1969-05-28	1969-09-06
1970	1970-04-28	1970-09-22
1971	1971-06-02	1971-10-02
1972	1972-05-19	1972-09-21
1973	1973-06-09	1973-09-02
1974	1974-05-20	1974-08-31
1975	1975-05-19	1975-10-13
1976	1976-06-11	1976-10-03
1977	1977-04-16	1977-09-08
1978	1978-05-25	1978-09-21
1980	1980-04-22	1980-10-08
1981	1981-04-10	1981-10-05
1988	1988-04-05	1988-09-22
1989	1989-04-24	1989-10-14
1990	1990-04-24	1990-10-05
1991	1991-05-14	1991-09-30
1992	1992-05-01	1992-10-15
1995	1995-06-07	1995-09-14
1996	1996-05-09	1996-09-11
2007	2007-04-30	2007-10-09
2008	2008-05-30	2008-09-14
2009	2009-04-24	2009-08-28
2014	2014-05-08	2014-10-01
2016	2016-05-30	2016-10-17
2017	2017-05-15	2017-09-27
2018	2018-05-02	2018-10-08
2019	2019-05-16	2019-10-03
2020	2020-04-08	2020-10-07
2022	2022-05-10	2022-09-22
2025	2025-05-15	2025-10-04
2026	2026-03-22	2026-10-12

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	102	109	1991	88
35 C (95 F): Days	96	58	1913	17
40 C (104 F): Days	15	13	1936	2
90 F (32.2 C): Days	102	86	1913	45
100 F (37.8 C): Days	42	32	1936	1
110 F (43.3 C): Days	2	1	1918	1
0 C (32 F): Ice days (max	102	54	1978	15
0 C (32 F): Frost days (min	123	133	1962	61
-10 C (14 F): Days with min	123	46	1963	21
-20 C (-4 F): Days with min	83	13	1936	3
-30 C (-22 F): Days with min	1	1	1905	1
20 C (68 F): Tropical nights (min	123	56	2025	57
25 C (77 F): Days with min	53	10	1936	4
10 mm (0.39 in): Days with 10 mm or more rain	118	51	1909	35
25 mm (0.98 in): Days with 25 mm or more rain	118	20	2008	12
50 mm (1.97 in): Days with 50 mm or more rain	103	5	1958	1
100 mm (3.94 in): Days with 100 mm or more rain	12	1	1905	1
10 cm (3.9 in): Days with 10 cm or more snowfall	71	7	1912	1
25 cm (9.8 in): Days with 25 cm or more snowfall	8	2	1973	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1897.

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 (USC00114108)

Key Facts for Hillsboro Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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