Alma Dam 4 Threshold Days by Year (USC00470124)

17 fixed thresholds counted per year at Alma Dam 4 (USC00470124): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Alma Dam 4 Thresholds

Alma Dam 4: days with 10 mm (0.39 in) or more of precipitation in 89 years, most in 1986 with 43.
Alma Dam 4: days with 25 mm (0.98 in) or more of precipitation in 89 years, most in 2019 with 18.
Alma Dam 4: nights with a minimum temperature at or below 0 C (32 F) in 80 years, most in 1980 with 168.
Alma Dam 4: nights with a minimum temperature at or below -10 C (14 F) in 80 years, most in 1950 with 92.
17 fixed thresholds have at least one qualifying day at Alma Dam 4.

Days at or above 30 C (86 F)

78 years with a qualifying day

Days per year at Alma Dam 4 with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 55 in 1988.

Days at or above 30 C (86 F) per year at Alma Dam 4
Year	Days	Decade average
1940	13	15
1941	24	15
1942	5	15
1943	18	15
1950	15	30.6
1952	35	30.6
1953	28	30.6
1954	26	30.6
1955	48	30.6
1956	29	30.6
1957	33	30.6
1958	23	30.6
1959	38	30.6
1960	21	27.2
1961	37	27.2
1962	22	27.2
1963	45	27.2
1964	40	27.2
1965	13	27.2
1966	35	27.2
1967	10	27.2
1968	24	27.2
1969	25	27.2
1970	35	27.5
1971	25	27.5
1972	30	27.5
1973	26	27.5
1974	25	27.5
1975	39	27.5
1976	30	27.5
1977	22	27.5
1978	34	27.5
1979	9	27.5
1980	37	32.1
1981	17	32.1
1983	48	32.1
1984	23	32.1
1986	25	32.1
1987	32	32.1
1988	55	32.1
1989	20	32.1
1990	17	15.8
1991	15	15.8
1992	8	15.8
1993	14	15.8
1994	7	15.8
1995	33	15.8
1996	11	15.8
1997	16	15.8
1998	17	15.8
1999	20	15.8
2000	14	22.6
2001	35	22.6
2002	28	22.6
2003	24	22.6
2004	7	22.6
2005	36	22.6
2006	25	22.6
2007	35	22.6
2008	9	22.6
2009	13	22.6
2010	34	26.7
2011	35	26.7
2012	52	26.7
2013	26	26.7
2014	9	26.7
2015	20	26.7
2016	25	26.7
2017	25	26.7
2018	31	26.7
2019	10	26.7
2020	27	27.1
2021	25	27.1
2022	22	27.1
2023	37	27.1
2024	20	27.1
2025	28	27.1
2026	31	27.1

For each year, a bar from the first to the last day at Alma Dam 4 meeting 30 C (86 F).

First to last qualifying date each year at Alma Dam 4
Year	First date	Last date
1940	1940-06-02	1940-09-07
1941	1941-06-24	1941-08-31
1942	1942-07-16	1942-08-21
1943	1943-06-19	1943-08-23
1950	1950-06-05	1950-10-19
1952	1952-04-28	1952-09-12
1953	1953-05-30	1953-09-02
1954	1954-06-10	1954-08-28
1955	1955-05-02	1955-09-18
1956	1956-06-08	1956-08-28
1957	1957-04-30	1957-09-01
1958	1958-05-29	1958-08-28
1959	1959-05-02	1959-09-08
1960	1960-07-18	1960-09-07
1961	1961-05-31	1961-09-10
1962	1962-05-16	1962-08-29
1963	1963-05-07	1963-10-06
1964	1964-04-16	1964-09-02
1965	1965-07-04	1965-08-17
1966	1966-05-26	1966-09-01
1967	1967-05-26	1967-08-16
1968	1968-06-04	1968-09-03
1969	1969-05-27	1969-08-30
1970	1970-04-29	1970-09-04
1971	1971-06-04	1971-09-07
1972	1972-05-17	1972-08-29
1973	1973-06-09	1973-09-01
1974	1974-06-30	1974-08-21
1975	1975-05-19	1975-08-23
1976	1976-06-08	1976-09-07
1977	1977-05-13	1977-08-27
1978	1978-05-26	1978-09-11
1979	1979-06-06	1979-08-07
1980	1980-04-21	1980-09-08
1981	1981-06-28	1981-09-10
1983	1983-06-11	1983-09-10
1984	1984-06-17	1984-09-19
1986	1986-05-31	1986-08-18
1987	1987-05-09	1987-08-17
1988	1988-05-28	1988-09-17
1989	1989-06-20	1989-08-10
1990	1990-06-16	1990-09-13
1991	1991-04-06	1991-08-30
1992	1992-05-01	1992-08-24
1993	1993-06-11	1993-08-26
1994	1994-06-14	1994-08-25
1995	1995-06-16	1995-08-31
1996	1996-05-18	1996-08-07
1997	1997-06-22	1997-10-03
1998	1998-05-14	1998-09-13
1999	1999-06-09	1999-09-04
2000	2000-05-05	2000-09-18
2001	2001-05-14	2001-08-10
2002	2002-04-15	2002-09-09
2003	2003-04-14	2003-09-08
2004	2004-04-28	2004-07-21
2005	2005-06-07	2005-09-21
2006	2006-05-28	2006-08-04
2007	2007-05-14	2007-10-06
2008	2008-06-25	2008-09-01
2009	2009-04-24	2009-08-14
2010	2010-05-24	2010-08-30
2011	2011-05-10	2011-09-12
2012	2012-05-18	2012-09-11
2013	2013-05-14	2013-09-10
2014	2014-05-31	2014-08-25
2015	2015-06-09	2015-09-06
2016	2016-05-06	2016-08-18
2017	2017-06-02	2017-09-24
2018	2018-05-24	2018-09-16
2019	2019-06-30	2019-09-16
2020	2020-06-02	2020-08-28
2021	2021-06-05	2021-09-20
2022	2022-05-13	2022-09-21
2023	2023-04-13	2023-10-03
2024	2024-05-13	2024-09-29
2025	2025-05-16	2025-10-05
2026	2026-05-16	2026-10-12

Every Fixed Threshold

Fixed thresholds at Alma Dam 4
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	78	55	1988	31
35 C (95 F): Days	32	10	1988	2
90 F (32.2 C): Days	73	36	1988	11
100 F (37.8 C): Days	7	1	1955	1
0 C (32 F): Ice days (max	78	99	1950	36
0 C (32 F): Frost days (min	80	168	1980	86
-10 C (14 F): Days with min	80	92	1950	33
-20 C (-4 F): Days with min	79	46	1978	10
-30 C (-22 F): Days with min	30	8	1979	3
20 C (68 F): Tropical nights (min	80	36	1955	31
25 C (77 F): Days with min	37	5	1940	1
10 mm (0.39 in): Days with 10 mm or more rain	89	43	1986	27
25 mm (0.98 in): Days with 25 mm or more rain	89	18	2019	5
50 mm (1.97 in): Days with 50 mm or more rain	59	6	2010	1
100 mm (3.94 in): Days with 100 mm or more rain	8	3	1978	1
10 cm (3.9 in): Days with 10 cm or more snowfall	66	8	2019	2
25 cm (9.8 in): Days with 25 cm or more snowfall	13	2	2019	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1940.

Download the Data

Data for Alma Dam 4 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).

Alma Dam 4 Threshold Days by Year (USC00470124)

Key Facts for Alma Dam 4 Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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