John Martin Dam Threshold Days by Year (USC00054388)

20 fixed thresholds counted per year at John Martin Dam (USC00054388): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for John Martin Dam Thresholds

John Martin Dam: days with a maximum temperature at or above 30 C (86 F) in 66 years, most in 1963 with 132.
John Martin Dam: days with a maximum temperature at or above 35 C (95 F) in 66 years, most in 2012 with 77.
John Martin Dam: days with a maximum temperature at or above 90 F (32.2 C) in 66 years, most in 1953 with 105.
John Martin Dam: days with a maximum temperature at or above 100 F (37.8 C) in 66 years, most in 2012 with 48.
20 fixed thresholds have at least one qualifying day at John Martin Dam.

Days at or above 30 C (86 F)

66 years with a qualifying day

Days per year at John Martin Dam with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 132 in 1963.

Days at or above 30 C (86 F) per year at John Martin Dam
Year	Days	Decade average
1942	74	91.1
1943	94	91.1
1944	91	91.1
1945	86	91.1
1946	95	91.1
1947	103	91.1
1948	98	91.1
1949	88	91.1
1950	74	105.3
1951	84	105.3
1952	117	105.3
1953	123	105.3
1954	122	105.3
1955	101	105.3
1956	127	105.3
1957	96	105.3
1958	97	105.3
1959	112	105.3
1960	105	106.2
1961	91	106.2
1962	118	106.2
1963	132	106.2
1964	118	106.2
1965	103	106.2
1966	120	106.2
1967	113	106.2
1968	82	106.2
1969	80	106.2
1970	98	105.5
1971	89	105.5
1972	99	105.5
1974	120	105.5
1975	117	105.5
1976	110	105.5
1989	90	90
1990	91	96.5
1997	102	96.5
1998	104	96.5
1999	89	96.5
2000	128	103.8
2001	102	103.8
2002	108	103.8
2003	105	103.8
2004	97	103.8
2005	103	103.8
2006	101	103.8
2007	101	103.8
2008	105	103.8
2009	88	103.8
2010	117	111.2
2011	122	111.2
2012	124	111.2
2013	108	111.2
2014	107	111.2
2015	107	111.2
2016	102	111.2
2017	100	111.2
2018	113	111.2
2019	112	111.2
2020	122	111
2021	106	111
2022	115	111
2023	92	111
2024	118	111
2025	105	111
2026	119	111

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

First to last qualifying date each year at John Martin Dam
Year	First date	Last date
1942	1942-05-25	1942-10-08
1943	1943-03-29	1943-10-18
1944	1944-05-14	1944-09-22
1945	1945-04-09	1945-10-10
1946	1946-03-30	1946-10-02
1947	1947-05-03	1947-10-21
1948	1948-04-17	1948-10-04
1949	1949-04-24	1949-10-07
1950	1950-04-22	1950-10-30
1951	1951-04-28	1951-10-12
1952	1952-05-03	1952-10-26
1953	1953-04-22	1953-10-12
1954	1954-04-06	1954-10-09
1955	1955-04-25	1955-10-11
1956	1956-04-26	1956-10-12
1957	1957-06-05	1957-10-04
1958	1958-05-20	1958-10-07
1959	1959-04-06	1959-09-22
1960	1960-04-10	1960-10-08
1961	1961-04-18	1961-10-07
1962	1962-04-19	1962-10-15
1963	1963-03-28	1963-10-13
1964	1964-04-16	1964-10-30
1965	1965-04-20	1965-10-15
1966	1966-05-03	1966-10-12
1967	1967-03-29	1967-10-14
1968	1968-05-01	1968-10-30
1969	1969-05-19	1969-10-03
1970	1970-05-05	1970-09-21
1971	1971-05-05	1971-10-02
1972	1972-04-07	1972-10-11
1974	1974-04-24	1974-10-11
1975	1975-04-22	1975-10-22
1976	1976-03-26	1976-10-13
1989	1989-03-11	1989-10-15
1990	1990-04-25	1990-09-27
1997	1997-05-07	1997-10-08
1998	1998-03-27	1998-10-16
1999	1999-05-14	1999-10-15
2000	2000-03-28	2000-10-12
2001	2001-04-19	2001-11-01
2002	2002-04-15	2002-10-12
2003	2003-04-14	2003-10-30
2004	2004-03-24	2004-10-22
2005	2005-05-11	2005-10-19
2006	2006-04-04	2006-10-06
2007	2007-04-21	2007-10-21
2008	2008-04-16	2008-10-05
2009	2009-04-21	2009-10-19
2010	2010-03-31	2010-10-16
2011	2011-03-22	2011-10-25
2012	2012-03-17	2012-10-24
2013	2013-04-30	2013-10-10
2014	2014-04-23	2014-10-25
2015	2015-03-17	2015-10-15
2016	2016-04-15	2016-11-01
2017	2017-03-19	2017-11-28
2018	2018-04-12	2018-10-04
2019	2019-04-10	2019-10-18
2020	2020-05-01	2020-11-07
2021	2021-03-30	2021-10-27
2022	2022-04-20	2022-10-03
2023	2023-04-12	2023-10-22
2024	2024-04-15	2024-10-13
2025	2025-03-28	2025-10-17
2026	2026-03-20	2026-09-27

Every Fixed Threshold

Fixed thresholds at John Martin Dam
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	66	132	1963	119
35 C (95 F): Days	66	77	2012	56
40 C (104 F): Days	48	26	2012	7
45 C (113 F): Days	1	1	2019	1
90 F (32.2 C): Days	66	105	1953	98
100 F (37.8 C): Days	66	48	2012	25
110 F (43.3 C): Days	8	4	2012	1
0 C (32 F): Ice days (max	66	43	1960	5
0 C (32 F): Frost days (min	61	177	1970	80
-10 C (14 F): Days with min	61	62	2007	14
-20 C (-4 F): Days with min	49	13	2011	1
-30 C (-22 F): Days with min	3	2	1948	1
20 C (68 F): Tropical nights (min	61	25	1954	13
25 C (77 F): Days with min	5	4	1952	1
10 mm (0.39 in): Days with 10 mm or more rain	66	17	2006	9
25 mm (0.98 in): Days with 25 mm or more rain	59	7	1944	3
50 mm (1.97 in): Days with 50 mm or more rain	19	2	1965	2
100 mm (3.94 in): Days with 100 mm or more rain	1	1	1990	1
10 cm (3.9 in): Days with 10 cm or more snowfall	22	5	1946	1
25 cm (9.8 in): Days with 25 cm or more snowfall	3	1	1946	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1942.

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Data for John Martin Dam 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).

John Martin Dam Threshold Days by Year (USC00054388)

Key Facts for John Martin Dam Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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