Mammoth Spring Threshold Days by Year (USC00034572)

19 fixed thresholds counted per year at Mammoth Spring (USC00034572): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Mammoth Spring Thresholds

Mammoth Spring: nights with a minimum temperature at or below 0 C (32 F) in 111 years, most in 1948 with 137.
Mammoth Spring: nights with a minimum temperature at or above 20 C (68 F) in 111 years, most in 1936 with 74.
Mammoth Spring: nights with a minimum temperature at or below -10 C (14 F) in 110 years, most in 1963 with 34.
Mammoth Spring: days with a maximum temperature at or above 30 C (86 F) in 109 years, most in 1939 with 126.
19 fixed thresholds have at least one qualifying day at Mammoth Spring.

Days at or above 30 C (86 F)

109 years with a qualifying day

Days per year at Mammoth Spring with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 126 in 1939.

Days at or above 30 C (86 F) per year at Mammoth Spring
Year	Days	Decade average
1907	85	83.3
1908	76	83.3
1909	89	83.3
1910	71	87.2
1911	103	87.2
1912	76	87.2
1913	107	87.2
1914	98	87.2
1915	70	87.2
1916	98	87.2
1917	54	87.2
1918	94	87.2
1919	101	87.2
1920	73	88.2
1921	114	88.2
1923	94	88.2
1924	62	88.2
1925	117	88.2
1926	91	88.2
1927	80	88.2
1928	80	88.2
1929	83	88.2
1931	92	99.7
1932	95	99.7
1933	84	99.7
1934	94	99.7
1935	73	99.7
1936	123	99.7
1937	102	99.7
1938	108	99.7
1939	126	99.7
1940	95	103
1941	124	103
1942	100	103
1943	105	103
1944	118	103
1945	79	103
1946	95	103
1947	95	103
1948	108	103
1949	111	103
1950	58	97.1
1953	125	97.1
1955	114	97.1
1956	123	97.1
1957	74	97.1
1958	96	97.1
1959	90	97.1
1960	89	90.3
1961	83	90.3
1962	114	90.3
1963	106	90.3
1967	57	90.3
1969	93	90.3
1970	103	95.3
1971	99	95.3
1972	106	95.3
1973	97	95.3
1974	73	95.3
1975	95	95.3
1976	80	95.3
1977	109	95.3
1978	104	95.3
1979	87	95.3
1980	119	99.7
1981	96	99.7
1982	89	99.7
1983	100	99.7
1984	103	99.7
1985	87	99.7
1986	106	99.7
1987	118	99.7
1989	79	99.7
1991	86	73.7
1992	50	73.7
1993	72	73.7
1994	68	73.7
1995	74	73.7
1996	71	73.7
1997	70	73.7
1998	90	73.7
1999	82	73.7
2000	78	81.6
2001	91	81.6
2002	90	81.6
2003	68	81.6
2004	65	81.6
2005	103	81.6
2006	92	81.6
2007	116	81.6
2008	61	81.6
2009	52	81.6
2010	101	84.7
2011	88	84.7
2012	90	84.7
2013	63	84.7
2014	58	84.7
2015	78	84.7
2016	89	84.7
2017	75	84.7
2018	109	84.7
2019	96	84.7
2020	75	85.1
2021	78	85.1
2022	80	85.1
2023	87	85.1
2024	82	85.1
2025	93	85.1
2026	101	85.1

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

First to last qualifying date each year at Mammoth Spring
Year	First date	Last date
1907	1907-03-19	1907-10-02
1908	1908-03-18	1908-09-19
1909	1909-05-05	1909-10-22
1910	1910-03-22	1910-10-02
1911	1911-03-09	1911-10-06
1912	1912-04-15	1912-10-11
1913	1913-04-17	1913-10-08
1914	1914-04-16	1914-09-08
1915	1915-04-28	1915-10-30
1916	1916-03-21	1916-10-07
1917	1917-06-10	1917-10-15
1918	1918-04-02	1918-10-06
1919	1919-04-22	1919-10-03
1920	1920-04-19	1920-10-14
1921	1921-03-20	1921-09-29
1923	1923-04-23	1923-09-30
1924	1924-04-09	1924-10-12
1925	1925-04-15	1925-10-07
1926	1926-04-17	1926-10-02
1927	1927-04-27	1927-10-28
1928	1928-03-23	1928-10-14
1929	1929-03-23	1929-09-29
1931	1931-05-16	1931-10-10
1932	1932-04-21	1932-09-18
1933	1933-05-09	1933-09-30
1934	1934-05-07	1934-09-20
1935	1935-06-12	1935-09-25
1936	1936-04-14	1936-09-23
1937	1937-04-17	1937-10-30
1938	1938-04-19	1938-10-17
1939	1939-03-22	1939-10-25
1940	1940-04-01	1940-10-25
1941	1941-04-11	1941-10-09
1942	1942-04-17	1942-10-12
1943	1943-04-04	1943-10-20
1944	1944-05-11	1944-10-06
1945	1945-04-13	1945-09-10
1946	1946-04-01	1946-10-09
1947	1947-04-30	1947-10-15
1948	1948-04-19	1948-09-26
1949	1949-04-24	1949-10-13
1950	1950-05-23	1950-11-01
1953	1953-04-08	1953-10-18
1955	1955-04-15	1955-11-13
1956	1956-03-06	1956-10-19
1957	1957-05-12	1957-09-20
1958	1958-05-12	1958-10-17
1959	1959-04-05	1959-10-03
1960	1960-04-06	1960-10-02
1961	1961-05-29	1961-10-24
1962	1962-02-12	1962-10-13
1963	1963-04-17	1963-10-26
1967	1967-03-11	1967-10-05
1969	1969-04-16	1969-10-04
1970	1970-04-28	1970-10-02
1971	1971-04-12	1971-10-16
1972	1972-04-12	1972-09-28
1973	1973-05-10	1973-10-09
1974	1974-04-01	1974-09-12
1975	1975-04-27	1975-11-08
1976	1976-04-03	1976-10-12
1977	1977-04-10	1977-10-01
1978	1978-04-01	1978-10-12
1979	1979-05-08	1979-10-21
1980	1980-04-21	1980-10-10
1981	1981-04-01	1981-10-05
1982	1982-03-16	1982-10-05
1983	1983-05-07	1983-10-03
1984	1984-04-25	1984-10-26
1985	1985-03-28	1985-10-13
1986	1986-03-29	1986-10-06
1987	1987-04-19	1987-09-28
1989	1989-04-22	1989-10-15
1991	1991-05-15	1991-10-19
1992	1992-04-15	1992-09-19
1993	1993-05-06	1993-09-24
1994	1994-04-20	1994-10-01
1995	1995-05-14	1995-09-15
1996	1996-04-20	1996-09-12
1997	1997-03-22	1997-10-06
1998	1998-05-13	1998-09-30
1999	1999-06-03	1999-09-29
2000	2000-05-24	2000-10-05
2001	2001-04-02	2001-09-14
2002	2002-04-14	2002-10-05
2003	2003-04-14	2003-10-21
2004	2004-05-06	2004-10-09
2005	2005-05-11	2005-10-20
2006	2006-04-13	2006-10-05
2007	2007-04-04	2007-10-09
2008	2008-05-20	2008-09-13
2009	2009-05-31	2009-09-09
2010	2010-05-06	2010-10-10
2011	2011-04-09	2011-10-17
2012	2012-04-01	2012-09-26
2013	2013-04-17	2013-09-20
2014	2014-05-05	2014-10-27
2015	2015-05-19	2015-10-16
2016	2016-03-16	2016-10-20
2017	2017-03-21	2017-10-15
2018	2018-05-07	2018-10-09
2019	2019-05-16	2019-10-04
2020	2020-03-27	2020-10-01
2021	2021-04-10	2021-10-10
2022	2022-05-10	2022-09-25
2023	2023-05-09	2023-10-03
2024	2024-02-28	2024-10-08
2025	2025-04-14	2025-10-02
2026	2026-03-21	2026-10-14

Every Fixed Threshold

Fixed thresholds at Mammoth Spring
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	109	126	1939	101
35 C (95 F): Days	106	68	1936	33
40 C (104 F): Days	24	15	1980	1
90 F (32.2 C): Days	109	103	1953	71
100 F (37.8 C): Days	64	37	1980	5
110 F (43.3 C): Days	1	3	1980	3
0 C (32 F): Ice days (max	105	23	1978	7
0 C (32 F): Frost days (min	111	137	1948	57
-10 C (14 F): Days with min	110	34	1963	13
-20 C (-4 F): Days with min	31	9	1918	1
-30 C (-22 F): Days with min	1	1	1918	1
20 C (68 F): Tropical nights (min	111	74	1936	62
25 C (77 F): Days with min	20	5	1934	1
10 mm (0.39 in): Days with 10 mm or more rain	103	59	2024	25
25 mm (0.98 in): Days with 25 mm or more rain	103	25	2015	8
50 mm (1.97 in): Days with 50 mm or more rain	95	9	2015	2
100 mm (3.94 in): Days with 100 mm or more rain	22	3	1982	1
200 mm (7.87 in): Days with 200 mm or more rain	1	1	1982	1
10 cm (3.9 in): Days with 10 cm or more snowfall	21	2	1956	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1907.

Download the Data

Data for Mammoth Spring 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).

Mammoth Spring Threshold Days by Year (USC00034572)

Key Facts for Mammoth Spring Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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