Lewiston Threshold Days by Year (USC00314962)

17 fixed thresholds counted per year at Lewiston (USC00314962): 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 69 years, most in 1996 with 52.
Lewiston: days with 25 mm (0.98 in) or more of precipitation in 69 years, most in 2018 with 20.
Lewiston: days with 50 mm (1.97 in) or more of precipitation in 65 years, most in 1999 with 9.
Lewiston: nights with a minimum temperature at or below 0 C (32 F) in 62 years, most in 1976 with 112.
17 fixed thresholds have at least one qualifying day at Lewiston.

Days at or above 30 C (86 F)

59 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 132 in 1990.

Days at or above 30 C (86 F) per year at Lewiston
Year	Days	Decade average
1955	82	94.4
1956	90	94.4
1957	114	94.4
1958	93	94.4
1959	93	94.4
1960	88	80
1961	92	80
1962	85	80
1963	75	80
1964	82	80
1965	99	80
1966	70	80
1967	63	80
1968	87	80
1969	59	80
1970	106	89.8
1971	82	89.8
1972	83	89.8
1974	80	89.8
1975	94	89.8
1976	88	89.8
1977	104	89.8
1978	99	89.8
1979	72	89.8
1980	105	96.5
1981	88	96.5
1990	132	93.9
1991	121	93.9
1992	77	93.9
1993	104	93.9
1994	86	93.9
1995	80	93.9
1996	79	93.9
1997	82	93.9
1998	101	93.9
1999	77	93.9
2000	81	94.8
2001	86	94.8
2002	118	94.8
2003	82	94.8
2004	100	94.8
2005	74	94.8
2006	86	94.8
2007	120	94.8
2008	99	94.8
2009	102	94.8
2010	123	95.6
2011	110	95.6
2012	95	95.6
2013	90	95.6
2014	57	95.6
2016	95	95.6
2017	82	95.6
2018	102	95.6
2019	106	95.6
2020	87	91.8
2021	86	91.8
2025	79	91.8
2026	115	91.8

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
1955	1955-04-19	1955-09-29
1956	1956-05-12	1956-09-23
1957	1957-04-21	1957-09-23
1958	1958-04-19	1958-10-10
1959	1959-04-09	1959-10-11
1960	1960-04-23	1960-09-21
1961	1961-04-23	1961-11-06
1962	1962-04-23	1962-10-12
1963	1963-04-02	1963-09-21
1964	1964-04-18	1964-09-29
1965	1965-04-12	1965-09-24
1966	1966-05-29	1966-09-11
1967	1967-04-02	1967-10-05
1968	1968-03-21	1968-10-04
1969	1969-05-05	1969-09-08
1970	1970-04-21	1970-10-14
1971	1971-04-13	1971-09-21
1972	1972-04-15	1972-09-30
1974	1974-03-07	1974-11-03
1975	1975-05-16	1975-10-14
1976	1976-03-04	1976-09-27
1977	1977-04-11	1977-10-02
1978	1978-04-11	1978-09-28
1979	1979-05-23	1979-11-23
1980	1980-04-23	1980-09-26
1981	1981-04-12	1981-10-07
1990	1990-03-11	1990-10-17
1991	1991-03-23	1991-09-19
1992	1992-04-10	1992-09-28
1993	1993-05-11	1993-09-26
1994	1994-04-19	1994-09-16
1995	1995-04-08	1995-10-02
1996	1996-04-22	1996-09-28
1997	1997-04-05	1997-10-10
1998	1998-03-29	1998-10-01
1999	1999-04-08	1999-09-26
2000	2000-03-08	2000-10-06
2001	2001-04-07	2001-10-24
2002	2002-04-15	2002-10-05
2003	2003-05-07	2003-09-27
2004	2004-04-18	2004-09-23
2005	2005-04-19	2005-10-20
2006	2006-04-07	2006-10-03
2007	2007-04-25	2007-10-24
2008	2008-04-18	2008-10-16
2009	2009-04-24	2009-10-10
2010	2010-04-04	2010-10-27
2011	2011-04-04	2011-10-17
2012	2012-03-15	2012-10-03
2013	2013-04-09	2013-10-07
2014	2014-04-02	2014-09-19
2016	2016-03-16	2016-10-19
2017	2017-04-21	2017-10-10
2018	2018-05-02	2018-10-10
2019	2019-04-30	2019-10-03
2020	2020-03-20	2020-09-11
2021	2021-04-28	2021-10-05
2025	2025-04-04	2025-09-26
2026	2026-03-10	2026-09-22

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	59	132	1990	115
35 C (95 F): Days	55	44	2002	22
40 C (104 F): Days	6	3	2007	1
90 F (32.2 C): Days	59	96	1990	70
100 F (37.8 C): Days	17	9	2010	3
0 C (32 F): Ice days (max	39	6	1958	4
0 C (32 F): Frost days (min	62	112	1976	38
-10 C (14 F): Days with min	48	22	1977	1
20 C (68 F): Tropical nights (min	62	114	2018	90
25 C (77 F): Days with min	25	9	1991	1
10 mm (0.39 in): Days with 10 mm or more rain	69	52	1996	32
25 mm (0.98 in): Days with 25 mm or more rain	69	20	2018	7
50 mm (1.97 in): Days with 50 mm or more rain	65	9	1999	3
100 mm (3.94 in): Days with 100 mm or more rain	19	3	1999	1
200 mm (7.87 in): Days with 200 mm or more rain	2	1	1999	1
10 cm (3.9 in): Days with 10 cm or more snowfall	11	3	1980	1
25 cm (9.8 in): Days with 25 cm or more snowfall	1	1	1980	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1955.

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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Lewiston Threshold Days by Year (USC00314962)

Key Facts for Lewiston Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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