Lewiston Threshold Days by Year (USC00174566)

17 fixed thresholds counted per year at Lewiston (USC00174566): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Lewiston Thresholds

Lewiston: days with 10 mm (0.39 in) or more of precipitation in 113 years, most in 1979 with 51.
Lewiston: days with 25 mm (0.98 in) or more of precipitation in 113 years, most in 1983 with 26.
Lewiston: days with a maximum temperature at or above 30 C (86 F) in 109 years, most in 1995 with 36.
Lewiston: days with a maximum temperature at or below 0 C (32 F) in 109 years, most in 1904 with 91.
17 fixed thresholds have at least one qualifying day at Lewiston.

Days at or above 30 C (86 F)

109 years with a qualifying day

Days per year at Lewiston with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 36 in 1995.

Days at or above 30 C (86 F) per year at Lewiston
Year	Days	Decade average
1893	23	24.7
1894	32	24.7
1895	25	24.7
1896	24	24.7
1897	22	24.7
1898	22	24.7
1899	25	24.7
1900	35	19.3
1901	26	19.3
1902	11	19.3
1903	7	19.3
1904	11	19.3
1905	15	19.3
1906	24	19.3
1907	17	19.3
1908	32	19.3
1909	15	19.3
1910	21	14.4
1911	26	14.4
1912	15	14.4
1913	18	14.4
1914	15	14.4
1915	6	14.4
1916	11	14.4
1917	8	14.4
1918	11	14.4
1919	13	14.4
1920	11	12.2
1921	23	12.2
1922	9	12.2
1923	10	12.2
1924	11	12.2
1925	13	12.2
1926	4	12.2
1927	6	12.2
1928	17	12.2
1929	18	12.2
1930	17	16.7
1931	16	16.7
1932	14	16.7
1933	9	16.7
1934	11	16.7
1935	19	16.7
1936	13	16.7
1937	32	16.7
1938	22	16.7
1939	14	16.7
1940	16	21.8
1941	29	21.8
1942	20	21.8
1943	16	21.8
1944	27	21.8
1945	14	21.8
1946	17	21.8
1947	31	21.8
1948	21	21.8
1949	27	21.8
1950	10	14.3
1951	11	14.3
1952	24	14.3
1953	13	14.3
1954	4	14.3
1955	27	14.3
1956	7	14.3
1957	16	14.3
1958	6	14.3
1959	25	14.3
1960	8	14.2
1961	22	14.2
1962	9	14.2
1963	19	14.2
1964	13	14.2
1965	21	14.2
1966	11	14.2
1967	11	14.2
1968	14	14.2
1969	14	14.2
1970	28	19.8
1971	18	19.8
1972	12	19.8
1973	21	19.8
1974	13	19.8
1975	20	19.8
1976	18	19.8
1977	18	19.8
1978	26	19.8
1979	24	19.8
1980	27	20.7
1981	16	20.7
1982	16	20.7
1983	31	20.7
1984	21	20.7
1985	16	20.7
1986	10	20.7
1987	14	20.7
1988	32	20.7
1989	24	20.7
1990	18	24
1991	31	24
1992	17	24
1993	26	24
1994	20	24
1995	36	24
1996	15	24
1997	21	24
1998	24	24
1999	32	24
2000	8	19.5
2001	31	19.5

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

First to last qualifying date each year at Lewiston
Year	First date	Last date
1893	1893-05-11	1893-08-28
1894	1894-06-11	1894-08-25
1895	1895-05-04	1895-09-23
1896	1896-05-10	1896-09-12
1897	1897-06-24	1897-09-10
1898	1898-06-25	1898-10-01
1899	1899-04-30	1899-09-19
1900	1900-05-15	1900-09-06
1901	1901-06-06	1901-09-07
1902	1902-05-23	1902-09-01
1903	1903-05-18	1903-09-15
1904	1904-06-21	1904-09-12
1905	1905-06-16	1905-08-22
1906	1906-06-09	1906-09-21
1907	1907-06-18	1907-09-15
1908	1908-05-26	1908-10-17
1909	1909-06-21	1909-10-09
1910	1910-06-20	1910-08-14
1911	1911-04-29	1911-09-02
1912	1912-06-24	1912-08-25
1913	1913-06-16	1913-09-03
1914	1914-05-26	1914-09-23
1915	1915-06-14	1915-09-17
1916	1916-07-12	1916-09-14
1917	1917-07-02	1917-08-28
1918	1918-05-18	1918-08-24
1919	1919-06-04	1919-07-28
1920	1920-06-01	1920-09-26
1921	1921-05-21	1921-09-03
1922	1922-06-05	1922-10-02
1923	1923-06-05	1923-08-04
1924	1924-06-24	1924-09-01
1925	1925-06-04	1925-09-12
1926	1926-06-29	1926-07-22
1927	1927-04-19	1927-07-16
1928	1928-07-03	1928-08-30
1929	1929-05-28	1929-09-03
1930	1930-05-02	1930-10-13
1931	1931-05-28	1931-09-14
1932	1932-05-16	1932-09-03
1933	1933-06-08	1933-07-28
1934	1934-06-05	1934-08-10
1935	1935-06-29	1935-08-20
1936	1936-05-18	1936-09-08
1937	1937-05-30	1937-09-04
1938	1938-06-20	1938-08-21
1939	1939-07-04	1939-09-16
1940	1940-06-13	1940-08-18
1941	1941-05-22	1941-09-22
1942	1942-05-29	1942-09-17
1943	1943-05-17	1943-08-02
1944	1944-05-05	1944-08-22
1945	1945-06-14	1945-09-08
1946	1946-05-25	1946-09-20
1947	1947-06-22	1947-10-17
1948	1948-06-30	1948-09-13
1949	1949-06-03	1949-08-28
1950	1950-06-08	1950-08-28
1951	1951-05-16	1951-09-13
1952	1952-06-09	1952-08-29
1953	1953-05-10	1953-09-02
1954	1954-06-21	1954-08-25
1955	1955-05-22	1955-09-18
1956	1956-06-12	1956-08-18
1957	1957-05-09	1957-09-22
1958	1958-07-02	1958-08-15
1959	1959-05-22	1959-09-24
1960	1960-06-27	1960-09-09
1961	1961-05-14	1961-09-26
1962	1962-05-19	1962-07-08
1963	1963-06-24	1963-08-22
1964	1964-05-23	1964-08-30
1965	1965-06-07	1965-09-23
1966	1966-05-24	1966-08-30
1967	1967-06-07	1967-08-28
1968	1968-07-01	1968-08-25
1969	1969-05-17	1969-09-01
1970	1970-05-31	1970-09-25
1971	1971-06-19	1971-09-08
1972	1972-05-23	1972-08-23
1973	1973-06-11	1973-09-03
1974	1974-06-05	1974-09-13
1975	1975-05-20	1975-08-11
1976	1976-04-18	1976-09-14
1977	1977-05-17	1977-08-29
1978	1978-05-28	1978-09-21
1979	1979-05-09	1979-09-03
1980	1980-06-23	1980-09-02
1981	1981-05-25	1981-08-22
1982	1982-05-26	1982-08-17
1983	1983-06-12	1983-09-20
1984	1984-05-26	1984-08-22
1985	1985-07-04	1985-09-20
1986	1986-05-19	1986-07-26
1987	1987-05-30	1987-08-18
1988	1988-05-28	1988-08-13
1989	1989-05-18	1989-09-10
1990	1990-04-27	1990-08-28
1991	1991-05-16	1991-09-17
1992	1992-05-21	1992-09-18
1993	1993-05-09	1993-09-15
1994	1994-05-31	1994-08-04
1995	1995-05-31	1995-09-07
1996	1996-06-01	1996-09-05
1997	1997-06-09	1997-08-16
1998	1998-05-21	1998-09-06
1999	1999-05-30	1999-09-05
2000	2000-06-17	2000-09-01
2001	2001-05-02	2001-09-10

Every Fixed Threshold

Fixed thresholds at Lewiston
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	109	36	1995	31
35 C (95 F): Days	57	11	1944	2
90 F (32.2 C): Days	108	23	1988	15
100 F (37.8 C): Days	6	5	1911	1
0 C (32 F): Ice days (max	109	91	1904	60
0 C (32 F): Frost days (min	109	178	1939	153
-10 C (14 F): Days with min	109	92	1904	53
-20 C (-4 F): Days with min	107	30	1904	4
-30 C (-22 F): Days with min	19	3	1917	3
20 C (68 F): Tropical nights (min	101	17	1988	9
25 C (77 F): Days with min	2	1	1993	1
10 mm (0.39 in): Days with 10 mm or more rain	113	51	1979	44
25 mm (0.98 in): Days with 25 mm or more rain	113	26	1983	16
50 mm (1.97 in): Days with 50 mm or more rain	85	7	1983	3
100 mm (3.94 in): Days with 100 mm or more rain	13	2	1996	1
10 cm (3.9 in): Days with 10 cm or more snowfall	74	16	1956	5
25 cm (9.8 in): Days with 25 cm or more snowfall	41	4	1969	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 Lewiston 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).

Lewiston Threshold Days by Year (USC00174566)

Key Facts for Lewiston Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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