Merrill Threshold Days by Year (USC00475364)

20 fixed thresholds counted per year at Merrill (USC00475364): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Merrill Thresholds

Merrill: days with 10 mm (0.39 in) or more of precipitation in 116 years, most in 2013 with 38.
Merrill: days with 25 mm (0.98 in) or more of precipitation in 114 years, most in 2014 with 16.
Merrill: nights with a minimum temperature at or below 0 C (32 F) in 105 years, most in 1917 with 209.
Merrill: nights with a minimum temperature at or below -10 C (14 F) in 105 years, most in 1978 with 109.
20 fixed thresholds have at least one qualifying day at Merrill.

Days at or above 30 C (86 F)

104 years with a qualifying day

Days per year at Merrill with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 53 in 1921.

Days at or above 30 C (86 F) per year at Merrill
Year	Days	Decade average
1906	32	22.7
1907	9	22.7
1908	27	22.7
1912	26	27
1913	33	27
1914	36	27
1915	15	27
1916	36	27
1917	18	27
1918	18	27
1919	34	27
1920	28	23.1
1921	53	23.1
1923	24	23.1
1924	8	23.1
1925	34	23.1
1926	17	23.1
1927	10	23.1
1928	14	23.1
1929	20	23.1
1930	38	34.2
1935	29	34.2
1936	46	34.2
1937	51	34.2
1938	17	34.2
1939	24	34.2
1940	17	19.1
1941	25	19.1
1942	11	19.1
1944	21	19.1
1945	14	19.1
1946	12	19.1
1947	20	19.1
1948	25	19.1
1949	27	19.1
1952	24	16.3
1953	19	16.3
1954	10	16.3
1955	32	16.3
1956	6	16.3
1957	18	16.3
1958	5	16.3
1960	18	17
1961	16	17
1962	10	17
1963	33	17
1964	22	17
1965	9	17
1966	27	17
1967	6	17
1969	12	17
1971	14	20
1975	35	20
1976	36	20
1977	18	20
1978	13	20
1979	4	20
1980	12	15.5
1981	7	15.5
1982	8	15.5
1983	30	15.5
1984	3	15.5
1985	6	15.5
1986	12	15.5
1987	27	15.5
1988	37	15.5
1989	13	15.5
1990	3	10.8
1991	16	10.8
1992	6	10.8
1993	2	10.8
1994	6	10.8
1995	20	10.8
1996	4	10.8
1997	8	10.8
1998	22	10.8
1999	21	10.8
2000	6	16
2001	23	16
2002	20	16
2003	19	16
2004	6	16
2005	25	16
2006	20	16
2007	26	16
2008	8	16
2009	7	16
2010	13	17.3
2011	17	17.3
2012	42	17.3
2013	14	17.3
2014	3	17.3
2015	10	17.3
2016	19	17.3
2017	14	17.3
2018	30	17.3
2019	11	17.3
2020	20	16.4
2021	15	16.4
2022	14	16.4
2023	21	16.4
2024	9	16.4
2025	14	16.4
2026	22	16.4

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

First to last qualifying date each year at Merrill
Year	First date	Last date
1906	1906-05-17	1906-09-12
1907	1907-06-15	1907-09-14
1908	1908-06-06	1908-09-26
1912	1912-05-23	1912-09-10
1913	1913-05-28	1913-09-07
1914	1914-05-26	1914-09-20
1915	1915-06-28	1915-09-05
1916	1916-07-01	1916-08-21
1917	1917-05-17	1917-08-22
1918	1918-06-11	1918-08-25
1919	1919-05-26	1919-09-08
1920	1920-05-31	1920-09-25
1921	1921-05-21	1921-09-09
1923	1923-05-30	1923-09-05
1924	1924-07-15	1924-08-30
1925	1925-04-22	1925-09-04
1926	1926-05-07	1926-08-29
1927	1927-06-28	1927-09-15
1928	1928-05-24	1928-08-16
1929	1929-05-29	1929-09-03
1930	1930-05-21	1930-09-23
1935	1935-07-03	1935-09-24
1936	1936-05-08	1936-09-22
1937	1937-05-30	1937-09-23
1938	1938-06-21	1938-08-19
1939	1939-05-30	1939-09-16
1940	1940-06-17	1940-09-19
1941	1941-06-20	1941-08-08
1942	1942-06-05	1942-08-31
1944	1944-05-30	1944-08-15
1945	1945-07-21	1945-09-07
1946	1946-06-27	1946-08-17
1947	1947-06-29	1947-09-09
1948	1948-06-01	1948-09-17
1949	1949-05-03	1949-08-27
1952	1952-04-28	1952-09-13
1953	1953-05-08	1953-09-03
1954	1954-06-13	1954-07-27
1955	1955-05-03	1955-09-18
1956	1956-06-09	1956-06-14
1957	1957-06-17	1957-09-01
1958	1958-07-01	1958-08-19
1960	1960-07-08	1960-09-07
1961	1961-06-06	1961-09-11
1962	1962-05-17	1962-08-28
1963	1963-06-03	1963-10-06
1964	1964-05-22	1964-08-17
1965	1965-06-27	1965-08-15
1966	1966-06-23	1966-09-01
1967	1967-05-26	1967-07-22
1969	1969-05-27	1969-08-31
1971	1971-06-04	1971-09-04
1975	1975-05-19	1975-08-25
1976	1976-06-08	1976-10-02
1977	1977-05-14	1977-08-28
1978	1978-05-27	1978-09-12
1979	1979-07-11	1979-07-24
1980	1980-04-23	1980-08-07
1981	1981-07-06	1981-08-14
1982	1982-07-06	1982-08-20
1983	1983-06-22	1983-09-04
1984	1984-08-07	1984-08-29
1985	1985-06-09	1985-09-07
1986	1986-05-29	1986-08-17
1987	1987-04-21	1987-08-16
1988	1988-06-01	1988-08-18
1989	1989-07-03	1989-08-05
1990	1990-06-30	1990-08-17
1991	1991-05-15	1991-08-31
1992	1992-05-02	1992-08-25
1993	1993-08-12	1993-08-26
1994	1994-06-15	1994-08-26
1995	1995-06-17	1995-08-31
1996	1996-06-28	1996-08-07
1997	1997-06-24	1997-08-03
1998	1998-05-15	1998-09-14
1999	1999-06-06	1999-09-05
2000	2000-06-09	2000-09-01
2001	2001-05-16	2001-08-23
2002	2002-04-16	2002-09-10
2003	2003-06-23	2003-09-09
2004	2004-06-08	2004-09-03
2005	2005-06-21	2005-09-12
2006	2006-05-29	2006-08-01
2007	2007-05-15	2007-09-06
2008	2008-07-08	2008-09-03
2009	2009-05-21	2009-08-15
2010	2010-05-25	2010-08-30
2011	2011-06-04	2011-08-07
2012	2012-05-20	2012-09-12
2013	2013-07-07	2013-09-08
2014	2014-05-31	2014-07-22
2015	2015-07-19	2015-09-07
2016	2016-05-07	2016-08-19
2017	2017-06-04	2017-09-26
2018	2018-05-25	2018-09-18
2019	2019-06-01	2019-08-05
2020	2020-06-03	2020-08-28
2021	2021-06-05	2021-08-21
2022	2022-05-13	2022-09-02
2023	2023-05-31	2023-09-06
2024	2024-06-19	2024-08-27
2025	2025-06-03	2025-08-16
2026	2026-05-27	2026-09-02

Every Fixed Threshold

Fixed thresholds at Merrill
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	104	53	1921	22
35 C (95 F): Days	36	11	1936	1
40 C (104 F): Days	1	5	1936	5
90 F (32.2 C): Days	89	37	1937	7
100 F (37.8 C): Days	5	8	1936	1
110 F (43.3 C): Days	1	2	1936	2
0 C (32 F): Ice days (max	104	115	2014	49
0 C (32 F): Frost days (min	105	209	1917	106
-10 C (14 F): Days with min	105	109	1978	52
-20 C (-4 F): Days with min	105	63	1978	18
-30 C (-22 F): Days with min	80	20	1979	4
-40 C (-40 F): Days with min	3	2	1907	2
20 C (68 F): Tropical nights (min	81	13	1908	5
10 mm (0.39 in): Days with 10 mm or more rain	116	38	2013	22
25 mm (0.98 in): Days with 25 mm or more rain	114	16	2014	4
50 mm (1.97 in): Days with 50 mm or more rain	63	4	1986	2
100 mm (3.94 in): Days with 100 mm or more rain	4	2	1912	1
10 cm (3.9 in): Days with 10 cm or more snowfall	100	10	2019	4
25 cm (9.8 in): Days with 25 cm or more snowfall	10	1	1929	1
50 cm (19.7 in): Days with 50 cm or more snowfall	1	1	1929	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1906.

Download the Data

Data for Merrill 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).

Merrill Threshold Days by Year (USC00475364)

Key Facts for Merrill Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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