Lewiston Threshold Days by Year (USC00304715)

17 fixed thresholds counted per year at Lewiston (USC00304715): 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 39 years, most in 1956 with 35.
Lewiston: days with 25 mm (0.98 in) or more of precipitation in 39 years, most in 1942 with 9.
Lewiston: days with a maximum temperature at or above 30 C (86 F) in 37 years, most in 1949 with 58.
Lewiston: days with a maximum temperature at or below 0 C (32 F) in 37 years, most in 1960 with 62.
17 fixed thresholds have at least one qualifying day at Lewiston.

Days at or above 30 C (86 F)

37 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 58 in 1949.

Days at or above 30 C (86 F) per year at Lewiston
Year	Days	Decade average
1936	45	36.8
1937	28	36.8
1938	36	36.8
1939	38	36.8
1940	27	36.7
1941	51	36.7
1942	24	36.7
1943	32	36.7
1944	37	36.7
1945	29	36.7
1946	32	36.7
1947	42	36.7
1948	35	36.7
1949	58	36.7
1950	25	31.5
1951	22	31.5
1952	40	31.5
1953	39	31.5
1954	24	31.5
1955	51	31.5
1956	16	31.5
1957	24	31.5
1958	20	31.5
1959	54	31.5
1960	15	18.1
1961	16	18.1
1962	23	18.1
1963	21	18.1
1964	35	18.1
1965	10	18.1
1966	25	18.1
1967	6	18.1
1968	18	18.1
1969	12	18.1
1970	7	6.7
1971	4	6.7
1972	9	6.7

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

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	37	58	1949	9
35 C (95 F): Days	18	12	1955	1
40 C (104 F): Days	1	2	1936	2
90 F (32.2 C): Days	35	33	1955	1
100 F (37.8 C): Days	4	5	1936	1
0 C (32 F): Ice days (max	37	62	1960	36
0 C (32 F): Frost days (min	37	156	1940	115
-10 C (14 F): Days with min	37	46	1963	30
-20 C (-4 F): Days with min	11	3	1942	1
20 C (68 F): Tropical nights (min	37	36	1959	21
25 C (77 F): Days with min	2	2	1972	2
10 mm (0.39 in): Days with 10 mm or more rain	39	35	1956	10
25 mm (0.98 in): Days with 25 mm or more rain	39	9	1942	4
50 mm (1.97 in): Days with 50 mm or more rain	13	2	1945	2
10 cm (3.9 in): Days with 10 cm or more snowfall	25	8	1950	3
25 cm (9.8 in): Days with 25 cm or more snowfall	5	1	1949	1
50 cm (19.7 in): Days with 50 cm or more snowfall	1	1	1966	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1936.

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 2026-10-12. Last revised 12 October 2026 (2026-10-12).

Lewiston Threshold Days by Year (USC00304715)

Key Facts for Lewiston Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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