Lewiston Threshold Days by Year (USC00425082)

17 fixed thresholds counted per year at Lewiston (USC00425082): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Lewiston Thresholds

Lewiston: days with a maximum temperature at or above 30 C (86 F) in 50 years, most in 1933 with 80.
Lewiston: days with a maximum temperature at or above 90 F (32.2 C) in 50 years, most in 1940 with 66.
Lewiston: days with a maximum temperature at or below 0 C (32 F) in 50 years, most in 1930 with 66.
Lewiston: nights with a minimum temperature at or below 0 C (32 F) in 49 years, most in 1968 with 210.
17 fixed thresholds have at least one qualifying day at Lewiston.

Days at or above 30 C (86 F)

50 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 80 in 1933.

Days at or above 30 C (86 F) per year at Lewiston
Year	Days	Decade average
1925	45	47.6
1926	48	47.6
1927	47	47.6
1928	41	47.6
1929	57	47.6
1930	56	67.1
1931	69	67.1
1932	57	67.1
1933	80	67.1
1934	73	67.1
1935	66	67.1
1936	71	67.1
1937	71	67.1
1938	65	67.1
1939	63	67.1
1940	76	60.6
1941	42	60.6
1942	69	60.6
1943	65	60.6
1944	53	60.6
1945	43	60.6
1946	63	60.6
1947	61	60.6
1948	70	60.6
1949	64	60.6
1950	56	63
1951	48	63
1952	66	63
1953	70	63
1954	58	63
1955	58	63
1956	72	63
1957	64	63
1958	79	63
1959	59	63
1960	63	53.5
1961	65	53.5
1962	50	53.5
1963	54	53.5
1964	50	53.5
1965	27	53.5
1966	69	53.5
1967	59	53.5
1968	43	53.5
1969	55	53.5
1970	54	51.4
1971	53	51.4
1972	39	51.4
1973	52	51.4
1974	59	51.4

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
1925	1925-06-24	1925-09-02
1926	1926-06-04	1926-08-29
1927	1927-05-16	1927-08-24
1928	1928-06-25	1928-09-17
1929	1929-06-15	1929-08-31
1930	1930-06-06	1930-09-01
1931	1931-06-06	1931-09-14
1932	1932-06-14	1932-09-08
1933	1933-06-10	1933-09-17
1934	1934-05-06	1934-09-07
1935	1935-06-12	1935-09-22
1936	1936-05-14	1936-09-20
1937	1937-06-21	1937-09-18
1938	1938-06-04	1938-09-30
1939	1939-05-29	1939-09-20
1940	1940-06-12	1940-09-10
1941	1941-05-11	1941-08-23
1942	1942-06-06	1942-09-08
1943	1943-05-27	1943-09-17
1944	1944-06-29	1944-09-13
1945	1945-06-21	1945-09-02
1946	1946-06-04	1946-09-13
1947	1947-05-03	1947-09-25
1948	1948-05-16	1948-09-15
1949	1949-06-10	1949-09-27
1950	1950-06-07	1950-09-08
1951	1951-05-28	1951-09-18
1952	1952-06-05	1952-09-26
1953	1953-06-11	1953-09-15
1954	1954-05-15	1954-09-11
1955	1955-06-19	1955-09-13
1956	1956-05-31	1956-09-20
1957	1957-06-03	1957-09-30
1958	1958-05-19	1958-09-11
1959	1959-06-06	1959-09-12
1960	1960-05-11	1960-09-27
1961	1961-06-09	1961-08-28
1962	1962-06-19	1962-09-19
1963	1963-06-28	1963-09-13
1964	1964-05-17	1964-08-26
1965	1965-06-23	1965-08-17
1966	1966-05-28	1966-09-24
1967	1967-05-24	1967-09-06
1968	1968-06-03	1968-09-11
1969	1969-05-26	1969-09-08
1970	1970-06-21	1970-09-03
1971	1971-06-21	1971-09-11
1972	1972-06-01	1972-08-23
1973	1973-06-08	1973-09-06
1974	1974-05-28	1974-09-10

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	50	80	1933	59
35 C (95 F): Days	44	29	1940	5
40 C (104 F): Days	2	1	1931	1
90 F (32.2 C): Days	50	66	1940	36
100 F (37.8 C): Days	9	8	1931	1
0 C (32 F): Ice days (max	50	66	1930	41
0 C (32 F): Frost days (min	49	210	1968	189
-10 C (14 F): Days with min	49	83	1964	60
-20 C (-4 F): Days with min	47	36	1964	20
-30 C (-22 F): Days with min	18	9	1932	2
-40 C (-40 F): Days with min	2	2	1930	1
20 C (68 F): Tropical nights (min	1	1	1938	1
10 mm (0.39 in): Days with 10 mm or more rain	49	24	1941	6
25 mm (0.98 in): Days with 25 mm or more rain	36	3	1943	1
50 mm (1.97 in): Days with 50 mm or more rain	1	1	1964	1
10 cm (3.9 in): Days with 10 cm or more snowfall	39	10	1955	6
25 cm (9.8 in): Days with 25 cm or more snowfall	3	2	1936	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1925.

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 (USC00425082)

Key Facts for Lewiston Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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