Hillsboro Threshold Days by Year (USC00473649)

18 fixed thresholds counted per year at Hillsboro (USC00473649): 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 64 years, most in 1955 with 63.
Hillsboro: days with a maximum temperature at or below 0 C (32 F) in 64 years, most in 1926 with 88.
Hillsboro: days with a maximum temperature at or above 90 F (32.2 C) in 63 years, most in 1955 with 41.
Hillsboro: nights with a minimum temperature at or below 0 C (32 F) in 60 years, most in 1917 with 212.
18 fixed thresholds have at least one qualifying day at Hillsboro.

Days at or above 30 C (86 F)

64 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 63 in 1955.

Days at or above 30 C (86 F) per year at Hillsboro
Year	Days	Decade average
1893	31	37.6
1894	56	37.6
1895	48	37.6
1896	30	37.6
1897	36	37.6
1898	33	37.6
1899	29	37.6
1900	42	26.4
1901	58	26.4
1902	13	26.4
1903	10	26.4
1904	15	26.4
1905	25	26.4
1906	26	26.4
1907	16	26.4
1908	35	26.4
1909	24	26.4
1911	33	23.2
1912	25	23.2
1913	27	23.2
1914	25	23.2
1915	4	23.2
1916	40	23.2
1917	12	23.2
1918	18	23.2
1919	25	23.2
1920	14	21.1
1921	40	21.1
1922	22	21.1
1923	39	21.1
1924	6	21.1
1925	22	21.1
1926	16	21.1
1928	13	21.1
1929	18	21.1
1930	34	34.4
1931	37	34.4
1932	15	34.4
1933	39	34.4
1934	43	34.4
1935	24	34.4
1936	50	34.4
1937	44	34.4
1938	21	34.4
1939	37	34.4
1940	17	28.7
1941	29	28.7
1942	13	28.7
1943	30	28.7
1944	17	28.7
1945	18	28.7
1946	18	28.7
1947	40	28.7
1948	54	28.7
1949	51	28.7
1950	12	32
1951	14	32
1952	45	32
1953	34	32
1954	28	32
1955	63	32
1956	31	32
1957	31	32
1958	30	32

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	1893-06-12	1893-09-14
1894	1894-05-14	1894-09-05
1895	1895-05-01	1895-09-21
1896	1896-05-06	1896-08-21
1897	1897-05-06	1897-10-14
1898	1898-06-03	1898-09-29
1899	1899-06-04	1899-09-16
1900	1900-05-11	1900-10-03
1901	1901-04-29	1901-09-06
1902	1902-05-20	1902-08-02
1903	1903-06-14	1903-08-05
1904	1904-06-18	1904-09-28
1905	1905-06-04	1905-09-28
1906	1906-05-17	1906-09-16
1907	1907-06-16	1907-08-31
1908	1908-06-20	1908-09-26
1909	1909-05-05	1909-08-26
1911	1911-05-10	1911-09-01
1912	1912-05-29	1912-09-09
1913	1913-06-15	1913-09-07
1914	1914-05-26	1914-09-21
1915	1915-07-12	1915-07-17
1916	1916-06-29	1916-08-22
1917	1917-07-20	1917-08-20
1918	1918-05-03	1918-08-25
1919	1919-05-30	1919-09-08
1920	1920-06-08	1920-09-25
1921	1921-05-22	1921-09-01
1922	1922-06-08	1922-09-08
1923	1923-06-01	1923-09-05
1924	1924-06-13	1924-08-30
1925	1925-05-22	1925-09-19
1926	1926-06-12	1926-08-28
1928	1928-05-09	1928-08-27
1929	1929-07-13	1929-09-03
1930	1930-04-10	1930-10-10
1931	1931-06-18	1931-09-20
1932	1932-06-22	1932-08-30
1933	1933-05-19	1933-09-08
1934	1934-05-06	1934-08-18
1935	1935-06-14	1935-08-19
1936	1936-05-16	1936-09-22
1937	1937-05-30	1937-09-23
1938	1938-06-23	1938-09-04
1939	1939-05-19	1939-09-16
1940	1940-06-02	1940-09-19
1941	1941-06-20	1941-09-04
1942	1942-06-28	1942-08-31
1943	1943-06-03	1943-08-23
1944	1944-05-30	1944-08-15
1945	1945-06-23	1945-09-07
1946	1946-06-16	1946-09-27
1947	1947-06-28	1947-09-19
1948	1948-05-20	1948-09-20
1949	1949-05-04	1949-08-26
1950	1950-05-24	1950-08-23
1951	1951-06-12	1951-08-30
1952	1952-04-28	1952-09-28
1953	1953-05-29	1953-10-02
1954	1954-06-09	1954-09-06
1955	1955-05-02	1955-09-19
1956	1956-05-22	1956-08-28
1957	1957-06-16	1957-09-02
1958	1958-06-28	1958-09-03

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	64	63	1955	30
35 C (95 F): Days	33	18	1936	2
40 C (104 F): Days	2	3	1936	3
90 F (32.2 C): Days	63	41	1955	12
100 F (37.8 C): Days	8	9	1936	3
0 C (32 F): Ice days (max	64	88	1926	56
0 C (32 F): Frost days (min	60	212	1917	169
-10 C (14 F): Days with min	60	95	1917	67
-20 C (-4 F): Days with min	60	47	1917	20
-30 C (-22 F): Days with min	38	19	1936	7
-40 C (-40 F): Days with min	7	3	1912	1
20 C (68 F): Tropical nights (min	58	23	1955	2
25 C (77 F): Days with min	3	2	1943	2
10 mm (0.39 in): Days with 10 mm or more rain	47	41	1899	15
25 mm (0.98 in): Days with 25 mm or more rain	47	11	1906	2
50 mm (1.97 in): Days with 50 mm or more rain	26	3	1903	1
10 cm (3.9 in): Days with 10 cm or more snowfall	25	6	1923	1
25 cm (9.8 in): Days with 25 cm or more snowfall	7	1	1924	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 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Hillsboro Threshold Days by Year (USC00473649)

Key Facts for Hillsboro Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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