Heppner Threshold Days by Year (USC00353827)

17 fixed thresholds counted per year at Heppner (USC00353827): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Heppner Thresholds

Heppner: days with 10 mm (0.39 in) or more of precipitation in 120 years, most in 1902 with 15.
Heppner: days with a maximum temperature at or above 30 C (86 F) in 119 years, most in 1967 with 72.
Heppner: days with a maximum temperature at or above 90 F (32.2 C) in 119 years, most in 2003 with 46.
Heppner: nights with a minimum temperature at or below 0 C (32 F) in 118 years, most in 1985 with 149.
17 fixed thresholds have at least one qualifying day at Heppner.

Days at or above 30 C (86 F)

119 years with a qualifying day

Days per year at Heppner with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 72 in 1967.

Days at or above 30 C (86 F) per year at Heppner
Year	Days	Decade average
1898	46	40.5
1899	35	40.5
1902	43	43
1906	54	43
1907	22	43
1908	53	43
1910	37	34.2
1911	34	34.2
1912	20	34.2
1913	34	34.2
1914	44	34.2
1915	37	34.2
1916	17	34.2
1917	38	34.2
1918	37	34.2
1919	44	34.2
1920	35	41.3
1921	38	41.3
1922	62	41.3
1923	34	41.3
1924	43	41.3
1925	50	41.3
1926	46	41.3
1927	35	41.3
1928	35	41.3
1929	35	41.3
1930	30	35.4
1931	38	35.4
1932	31	35.4
1933	35	35.4
1934	42	35.4
1935	35	35.4
1936	37	35.4
1937	32	35.4
1938	37	35.4
1939	37	35.4
1940	25	27.2
1941	32	27.2
1942	38	27.2
1943	25	27.2
1944	32	27.2
1945	39	27.2
1946	26	27.2
1947	19	27.2
1948	15	27.2
1949	21	27.2
1950	30	32.3
1951	31	32.3
1952	36	32.3
1953	28	32.3
1954	16	32.3
1955	35	32.3
1956	34	32.3
1957	19	32.3
1958	63	32.3
1959	31	32.3
1960	55	44.3
1961	58	44.3
1962	32	44.3
1963	35	44.3
1964	29	44.3
1965	36	44.3
1966	44	44.3
1967	72	44.3
1968	41	44.3
1969	41	44.3
1970	54	43.5
1971	43	43.5
1972	45	43.5
1973	52	43.5
1974	48	43.5
1975	35	43.5
1976	32	43.5
1977	50	43.5
1978	31	43.5
1979	45	43.5
1980	34	43.4
1982	42	43.4
1983	39	43.4
1984	49	43.4
1985	44	43.4
1986	55	43.4
1987	49	43.4
1988	50	43.4
1989	29	43.4
1990	50	46.6
1991	46	46.6
1992	50	46.6
1993	34	46.6
1994	56	46.6
1995	44	46.6
1996	49	46.6
1997	47	46.6
1998	44	46.6
1999	46	46.6
2000	46	50
2001	60	50
2002	57	50
2003	66	50
2004	49	50
2005	28	50
2006	50	50
2007	43	50
2009	51	50
2010	34	44.2
2011	40	44.2
2012	44	44.2
2013	61	44.2
2014	48	44.2
2016	39	44.2
2017	64	44.2
2018	42	44.2
2019	26	44.2
2020	42	46.2
2021	61	46.2
2022	54	46.2
2023	39	46.2
2024	47	46.2
2026	34	46.2

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

First to last qualifying date each year at Heppner
Year	First date	Last date
1898	1898-06-09	1898-09-18
1899	1899-06-16	1899-10-05
1902	1902-05-26	1902-09-13
1906	1906-05-09	1906-09-20
1907	1907-06-18	1907-09-10
1908	1908-06-08	1908-09-13
1910	1910-04-25	1910-08-20
1911	1911-06-10	1911-09-01
1912	1912-06-07	1912-08-24
1913	1913-06-01	1913-09-17
1914	1914-05-31	1914-09-02
1915	1915-06-22	1915-09-04
1916	1916-06-15	1916-09-01
1917	1917-06-08	1917-08-29
1918	1918-06-05	1918-09-19
1919	1919-06-18	1919-09-25
1920	1920-06-21	1920-09-03
1921	1921-06-06	1921-08-30
1922	1922-05-31	1922-09-19
1923	1923-06-28	1923-09-14
1924	1924-05-11	1924-09-15
1925	1925-06-18	1925-09-23
1926	1926-04-28	1926-08-25
1927	1927-06-21	1927-08-28
1928	1928-05-19	1928-09-03
1929	1929-06-24	1929-09-16
1930	1930-06-06	1930-09-05
1931	1931-05-12	1931-09-06
1932	1932-06-13	1932-09-08
1933	1933-06-13	1933-08-28
1934	1934-05-15	1934-09-18
1935	1935-06-05	1935-09-14
1936	1936-05-11	1936-09-25
1937	1937-06-03	1937-09-16
1938	1938-05-24	1938-09-17
1939	1939-04-29	1939-09-23
1940	1940-06-11	1940-10-19
1941	1941-05-24	1941-08-22
1942	1942-06-29	1942-09-25
1943	1943-07-03	1943-10-05
1944	1944-06-25	1944-09-13
1945	1945-06-19	1945-09-14
1946	1946-06-20	1946-08-25
1947	1947-05-02	1947-09-24
1948	1948-06-08	1948-09-15
1949	1949-05-13	1949-09-02
1950	1950-06-29	1950-09-03
1951	1951-05-23	1951-09-25
1952	1952-06-05	1952-09-26
1953	1953-05-06	1953-09-16
1954	1954-05-19	1954-08-30
1955	1955-06-07	1955-09-08
1956	1956-05-18	1956-09-16
1957	1957-05-31	1957-09-25
1958	1958-05-22	1958-09-09
1959	1959-06-20	1959-09-14
1960	1960-06-02	1960-09-20
1961	1961-06-03	1961-09-05
1962	1962-06-24	1962-09-07
1963	1963-06-15	1963-09-29
1964	1964-06-23	1964-09-25
1965	1965-06-06	1965-09-02
1966	1966-05-04	1966-09-22
1967	1967-05-16	1967-09-29
1968	1968-06-01	1968-09-09
1969	1969-05-11	1969-09-12
1970	1970-06-01	1970-09-30
1971	1971-06-21	1971-08-30
1972	1972-05-13	1972-09-15
1973	1973-05-13	1973-09-12
1974	1974-06-10	1974-09-25
1975	1975-06-01	1975-09-15
1976	1976-05-16	1976-09-30
1977	1977-04-24	1977-09-04
1978	1978-06-04	1978-09-26
1979	1979-05-22	1979-09-20
1980	1980-07-01	1980-10-07
1982	1982-06-11	1982-09-09
1983	1983-05-24	1983-09-01
1984	1984-05-30	1984-09-19
1985	1985-05-23	1985-08-30
1986	1986-05-26	1986-09-05
1987	1987-05-07	1987-09-24
1988	1988-05-12	1988-10-01
1989	1989-06-02	1989-09-25
1990	1990-05-06	1990-09-25
1991	1991-06-11	1991-10-01
1992	1992-05-04	1992-10-02
1993	1993-05-11	1993-09-11
1994	1994-05-08	1994-09-28
1995	1995-05-30	1995-09-17
1996	1996-06-03	1996-09-30
1997	1997-05-13	1997-09-30
1998	1998-06-30	1998-08-31
1999	1999-05-25	1999-09-24
2000	2000-05-22	2000-09-18
2001	2001-05-13	2001-09-25
2002	2002-06-13	2002-09-20
2003	2003-05-25	2003-09-27
2004	2004-06-04	2004-08-31
2005	2005-05-28	2005-09-09
2006	2006-05-16	2006-08-29
2007	2007-05-09	2007-09-13
2009	2009-05-29	2009-09-25
2010	2010-05-17	2010-09-04
2011	2011-06-23	2011-09-25
2012	2012-04-24	2012-09-21
2013	2013-05-10	2013-09-17
2014	2014-05-16	2014-09-22
2016	2016-06-04	2016-09-27
2017	2017-05-24	2017-09-13
2018	2018-05-16	2018-09-08
2019	2019-06-03	2019-09-08
2020	2020-05-30	2020-09-11
2021	2021-06-01	2021-09-26
2022	2022-06-23	2022-09-08
2023	2023-05-20	2023-09-17
2024	2024-06-22	2024-09-26
2026	2026-06-16	2026-08-27

Every Fixed Threshold

Fixed thresholds at Heppner
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	119	72	1967	34
35 C (95 F): Days	113	24	1971	3
40 C (104 F): Days	19	3	1928	1
90 F (32.2 C): Days	119	46	2003	15
100 F (37.8 C): Days	61	9	1971	1
110 F (43.3 C): Days	1	1	1898	1
0 C (32 F): Ice days (max	117	54	1985	15
0 C (32 F): Frost days (min	118	149	1985	33
-10 C (14 F): Days with min	111	38	1916	7
-20 C (-4 F): Days with min	49	12	1924	1
20 C (68 F): Tropical nights (min	59	6	2021	1
25 C (77 F): Days with min	1	2	2021	2
10 mm (0.39 in): Days with 10 mm or more rain	120	15	1902	4
25 mm (0.98 in): Days with 25 mm or more rain	37	3	1923	2
50 mm (1.97 in): Days with 50 mm or more rain	2	1	1957	1
10 cm (3.9 in): Days with 10 cm or more snowfall	50	5	1929	1
25 cm (9.8 in): Days with 25 cm or more snowfall	8	1	1919	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1898.

Download the Data

Data for Heppner 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).

Heppner Threshold Days by Year (USC00353827)

Key Facts for Heppner Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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