Hillsboro Threshold Days by Year (USC00353908)

15 fixed thresholds counted per year at Hillsboro (USC00353908): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Hillsboro Thresholds

Hillsboro: days with 10 mm (0.39 in) or more of precipitation in 70 years, most in 1996 with 59.
Hillsboro: days with 25 mm (0.98 in) or more of precipitation in 70 years, most in 1937 with 14.
Hillsboro: days with a maximum temperature at or above 30 C (86 F) in 69 years, most in 1958 with 58.
Hillsboro: nights with a minimum temperature at or below 0 C (32 F) in 69 years, most in 1985 with 112.
15 fixed thresholds have at least one qualifying day at Hillsboro.

Days at or above 30 C (86 F)

69 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 58 in 1958.

Days at or above 30 C (86 F) per year at Hillsboro
Year	Days	Decade average
1930	20	30.6
1931	40	30.6
1932	36	30.6
1933	27	30.6
1934	31	30.6
1935	38	30.6
1936	25	30.6
1937	26	30.6
1938	33	30.6
1939	30	30.6
1940	27	25.8
1941	21	25.8
1942	22	25.8
1943	27	25.8
1944	32	25.8
1945	32	25.8
1946	27	25.8
1947	18	25.8
1948	25	25.8
1949	27	25.8
1950	44	33.3
1951	47	33.3
1952	51	33.3
1953	25	33.3
1954	7	33.3
1955	24	33.3
1956	30	33.3
1957	22	33.3
1958	58	33.3
1959	25	33.3
1960	29	27.9
1961	53	27.9
1962	25	27.9
1963	22	27.9
1964	10	27.9
1965	23	27.9
1966	16	27.9
1967	56	27.9
1968	23	27.9
1969	22	27.9
1970	37	26.7
1971	26	26.7
1972	32	26.7
1973	26	26.7
1974	34	26.7
1975	25	26.7
1976	12	26.7
1977	25	26.7
1978	27	26.7
1979	23	26.7
1980	15	25.8
1981	31	25.8
1982	25	25.8
1983	12	25.8
1984	17	25.8
1985	26	25.8
1986	34	25.8
1987	47	25.8
1988	29	25.8
1989	22	25.8
1990	30	31.8
1991	33	31.8
1992	42	31.8
1993	24	31.8
1994	29	31.8
1995	26	31.8
1996	28	31.8
1997	30	31.8
1998	44	31.8

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
1930	1930-06-15	1930-09-02
1931	1931-04-27	1931-09-04
1932	1932-06-09	1932-10-04
1933	1933-06-12	1933-08-27
1934	1934-04-19	1934-09-04
1935	1935-05-20	1935-09-28
1936	1936-05-10	1936-10-10
1937	1937-06-01	1937-09-15
1938	1938-05-21	1938-09-17
1939	1939-05-12	1939-09-21
1940	1940-05-21	1940-08-30
1941	1941-05-11	1941-08-20
1942	1942-06-29	1942-09-23
1943	1943-05-24	1943-09-24
1944	1944-05-04	1944-09-25
1945	1945-06-17	1945-09-12
1946	1946-06-19	1946-09-09
1947	1947-04-14	1947-09-24
1948	1948-05-24	1948-09-13
1949	1949-05-11	1949-09-28
1950	1950-06-03	1950-09-22
1951	1951-05-21	1951-09-21
1952	1952-05-26	1952-10-06
1953	1953-05-05	1953-09-15
1954	1954-05-17	1954-09-25
1955	1955-06-07	1955-09-07
1956	1956-04-20	1956-09-06
1957	1957-04-28	1957-09-23
1958	1958-05-15	1958-10-03
1959	1959-06-01	1959-09-10
1960	1960-06-02	1960-09-27
1961	1961-05-19	1961-09-04
1962	1962-06-23	1962-09-24
1963	1963-05-17	1963-09-27
1964	1964-07-12	1964-08-25
1965	1965-06-08	1965-09-25
1966	1966-05-05	1966-09-21
1967	1967-05-21	1967-09-27
1968	1968-06-24	1968-09-05
1969	1969-05-22	1969-09-11
1970	1970-05-25	1970-10-02
1971	1971-05-11	1971-08-28
1972	1972-05-27	1972-09-14
1973	1973-05-13	1973-09-10
1974	1974-06-11	1974-09-25
1975	1975-05-13	1975-09-30
1976	1976-06-18	1976-09-20
1977	1977-06-05	1977-09-12
1978	1978-05-20	1978-08-29
1979	1979-05-25	1979-09-25
1980	1980-07-08	1980-10-06
1981	1981-06-26	1981-09-17
1982	1982-06-10	1982-09-03
1983	1983-05-23	1983-08-14
1984	1984-05-29	1984-09-18
1985	1985-05-17	1985-08-27
1986	1986-05-30	1986-09-07
1987	1987-04-27	1987-10-07
1988	1988-05-22	1988-10-02
1989	1989-06-02	1989-09-29
1990	1990-05-05	1990-09-23
1991	1991-07-03	1991-10-11
1992	1992-05-04	1992-09-23
1993	1993-05-18	1993-10-03
1994	1994-05-07	1994-09-27
1995	1995-05-28	1995-09-14
1996	1996-06-02	1996-09-10
1997	1997-05-11	1997-09-24
1998	1998-04-29	1998-09-30

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	69	58	1958	44
35 C (95 F): Days	61	18	1958	11
40 C (104 F): Days	12	2	1935	2
90 F (32.2 C): Days	68	37	1952	22
100 F (37.8 C): Days	37	6	1961	4
0 C (32 F): Ice days (max	47	18	1930	5
0 C (32 F): Frost days (min	69	112	1985	21
-10 C (14 F): Days with min	34	12	1930	3
-20 C (-4 F): Days with min	2	3	1950	3
20 C (68 F): Tropical nights (min	5	2	1958	1
10 mm (0.39 in): Days with 10 mm or more rain	70	59	1996	26
25 mm (0.98 in): Days with 25 mm or more rain	70	14	1937	8
50 mm (1.97 in): Days with 50 mm or more rain	23	4	1996	4
10 cm (3.9 in): Days with 10 cm or more snowfall	13	3	1937	1
25 cm (9.8 in): Days with 25 cm or more snowfall	1	1	1943	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1930.

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 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Hillsboro Threshold Days by Year (USC00353908)

Key Facts for Hillsboro Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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