Orono Threshold Days by Year (USC00176430)

20 fixed thresholds counted per year at Orono (USC00176430): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Orono Thresholds

Orono: nights with a minimum temperature at or below 0 C (32 F) in 88 years, most in 1939 with 198.
Orono: nights with a minimum temperature at or below -10 C (14 F) in 88 years, most in 1989 with 94.
Orono: nights with a minimum temperature at or below -20 C (-4 F) in 88 years, most in 1904 with 39.
Orono: days with a maximum temperature at or above 30 C (86 F) in 84 years, most in 1937 with 45.
20 fixed thresholds have at least one qualifying day at Orono.

Days at or above 30 C (86 F)

84 years with a qualifying day

Days per year at Orono with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 45 in 1937.

Days at or above 30 C (86 F) per year at Orono
Year	Days	Decade average
1894	14	9
1897	7	9
1898	6	9
1899	9	9
1900	14	14
1901	17	14
1902	4	14
1903	5	14
1904	8	14
1905	14	14
1906	16	14
1907	12	14
1908	31	14
1909	19	14
1910	14	18
1911	26	18
1913	16	18
1918	19	18
1919	15	18
1920	10	17.8
1921	18	17.8
1928	20	17.8
1929	23	17.8
1930	23	26.2
1931	29	26.2
1932	31	26.2
1933	20	26.2
1934	11	26.2
1935	35	26.2
1936	17	26.2
1937	45	26.2
1938	27	26.2
1939	24	26.2
1940	28	26.1
1941	38	26.1
1942	21	26.1
1943	18	26.1
1944	31	26.1
1945	25	26.1
1946	22	26.1
1952	27	12.2
1953	16	12.2
1956	5	12.2
1957	10	12.2
1958	3	12.2
1962	3	10.5
1963	11	10.5
1964	4	10.5
1965	13	10.5
1966	11	10.5
1967	6	10.5
1968	21	10.5
1969	15	10.5
1970	20	20.1
1971	13	20.1
1972	13	20.1
1973	21	20.1
1974	22	20.1
1975	24	20.1
1976	25	20.1
1977	23	20.1
1978	26	20.1
1979	14	20.1
1980	12	16.6
1981	18	16.6
1982	23	16.6
1983	27	16.6
1984	14	16.6
1985	8	16.6
1986	11	16.6
1987	15	16.6
1988	32	16.6
1989	6	16.6
1990	8	18.3
1991	11	18.3
1992	3	18.3
1993	24	18.3
1994	23	18.3
1995	36	18.3
1996	21	18.3
1997	23	18.3
1998	12	18.3
1999	22	18.3
2003	16	16

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

First to last qualifying date each year at Orono
Year	First date	Last date
1894	1894-06-16	1894-09-07
1897	1897-07-07	1897-09-10
1898	1898-06-26	1898-10-03
1899	1899-06-14	1899-09-18
1900	1900-06-28	1900-09-03
1901	1901-06-06	1901-09-07
1902	1902-07-08	1902-07-31
1903	1903-07-02	1903-09-16
1904	1904-06-26	1904-08-02
1905	1905-06-16	1905-08-12
1906	1906-07-14	1906-08-23
1907	1907-06-18	1907-08-12
1908	1908-06-07	1908-09-26
1909	1909-06-24	1909-08-26
1910	1910-06-21	1910-07-28
1911	1911-05-22	1911-08-16
1913	1913-06-23	1913-09-04
1918	1918-05-18	1918-08-26
1919	1919-06-03	1919-07-22
1920	1920-06-01	1920-09-25
1921	1921-05-21	1921-09-04
1928	1928-07-02	1928-08-29
1929	1929-05-28	1929-09-02
1930	1930-05-06	1930-10-14
1931	1931-05-20	1931-09-14
1932	1932-05-16	1932-09-12
1933	1933-05-19	1933-09-02
1934	1934-06-06	1934-09-08
1935	1935-05-27	1935-08-21
1936	1936-05-18	1936-09-07
1937	1937-05-03	1937-09-26
1938	1938-06-01	1938-10-12
1939	1939-06-21	1939-09-16
1940	1940-05-27	1940-09-01
1941	1941-05-17	1941-09-22
1942	1942-04-25	1942-09-18
1943	1943-05-24	1943-08-09
1944	1944-05-04	1944-08-22
1945	1945-04-11	1945-09-08
1946	1946-06-24	1946-10-07
1952	1952-06-15	1952-08-29
1953	1953-05-10	1953-09-03
1956	1956-06-13	1956-08-18
1957	1957-05-08	1957-07-21
1958	1958-08-02	1958-08-06
1962	1962-06-15	1962-06-29
1963	1963-06-04	1963-07-29
1964	1964-05-24	1964-07-27
1965	1965-06-10	1965-09-22
1966	1966-05-24	1966-08-07
1967	1967-06-04	1967-08-30
1968	1968-05-16	1968-09-01
1969	1969-05-17	1969-09-02
1970	1970-06-10	1970-08-16
1971	1971-06-19	1971-08-10
1972	1972-05-28	1972-09-01
1973	1973-06-08	1973-09-03
1974	1974-06-05	1974-08-23
1975	1975-06-11	1975-08-16
1976	1976-04-19	1976-08-23
1977	1977-05-17	1977-08-30
1978	1978-05-24	1978-08-23
1979	1979-05-09	1979-08-05
1980	1980-06-23	1980-08-26
1981	1981-05-25	1981-08-22
1982	1982-05-26	1982-09-11
1983	1983-06-12	1983-09-07
1984	1984-06-09	1984-08-07
1985	1985-07-01	1985-08-15
1986	1986-05-19	1986-08-09
1987	1987-05-31	1987-08-19
1988	1988-05-28	1988-08-13
1989	1989-06-26	1989-07-28
1990	1990-07-15	1990-08-05
1991	1991-06-20	1991-08-14
1992	1992-05-22	1992-07-25
1993	1993-06-14	1993-08-28
1994	1994-06-16	1994-08-09
1995	1995-06-01	1995-09-05
1996	1996-06-01	1996-09-05
1997	1997-06-09	1997-08-17
1998	1998-05-29	1998-08-10
1999	1999-05-31	1999-09-04
2003	2003-05-20	2003-08-22

Every Fixed Threshold

Fixed thresholds at Orono
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	84	45	1937	16
35 C (95 F): Days	44	10	1937	1
40 C (104 F): Days	1	1	1935	1
90 F (32.2 C): Days	77	28	1937	7
100 F (37.8 C): Days	4	3	1935	1
0 C (32 F): Ice days (max	84	89	1904	71
0 C (32 F): Frost days (min	88	198	1939	153
-10 C (14 F): Days with min	88	94	1989	65
-20 C (-4 F): Days with min	88	39	1904	18
-30 C (-22 F): Days with min	23	6	1934	1
-40 C (-40 F): Days with min	1	1	1907	1
20 C (68 F): Tropical nights (min	44	12	1937	5
25 C (77 F): Days with min	2	2	1928	1
10 mm (0.39 in): Days with 10 mm or more rain	79	50	1900	34
25 mm (0.98 in): Days with 25 mm or more rain	79	19	1900	9
50 mm (1.97 in): Days with 50 mm or more rain	50	5	1898	1
100 mm (3.94 in): Days with 100 mm or more rain	3	1	1962	1
10 cm (3.9 in): Days with 10 cm or more snowfall	43	14	1972	7
25 cm (9.8 in): Days with 25 cm or more snowfall	22	4	1987	2
50 cm (19.7 in): Days with 50 cm or more snowfall	4	1	1962	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1894.

Download the Data

Data for Orono 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).

Orono Threshold Days by Year (USC00176430)

Key Facts for Orono Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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