Grand Rapids Forestry Lab Threshold Days by Year (USC00213303)

19 fixed thresholds counted per year at Grand Rapids Forestry Lab (USC00213303): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Grand Rapids Forestry Lab Thresholds

Grand Rapids Forestry Lab: days with a maximum temperature at or above 30 C (86 F) in 110 years, most in 1923 with 46.
Grand Rapids Forestry Lab: days with a maximum temperature at or below 0 C (32 F) in 110 years, most in 1955 with 122.
Grand Rapids Forestry Lab: nights with a minimum temperature at or below 0 C (32 F) in 110 years, most in 1917 with 230.
Grand Rapids Forestry Lab: nights with a minimum temperature at or below -10 C (14 F) in 110 years, most in 1937 with 131.
19 fixed thresholds have at least one qualifying day at Grand Rapids Forestry Lab.

Days at or above 30 C (86 F)

110 years with a qualifying day

Days per year at Grand Rapids Forestry Lab with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 46 in 1923.

Days at or above 30 C (86 F) per year at Grand Rapids Forestry Lab
Year	Days	Decade average
1916	31	23.3
1917	23	23.3
1918	11	23.3
1919	28	23.3
1920	12	23.6
1921	42	23.6
1922	35	23.6
1923	46	23.6
1924	12	23.6
1925	27	23.6
1926	25	23.6
1927	8	23.6
1928	9	23.6
1929	20	23.6
1930	25	24.1
1931	31	24.1
1932	15	24.1
1933	31	24.1
1934	19	24.1
1935	17	24.1
1936	35	24.1
1937	27	24.1
1938	17	24.1
1939	24	24.1
1940	17	13.5
1941	20	13.5
1942	4	13.5
1943	16	13.5
1944	9	13.5
1945	9	13.5
1946	2	13.5
1947	26	13.5
1948	20	13.5
1949	12	13.5
1950	3	9.3
1951	6	9.3
1952	14	9.3
1953	11	9.3
1954	7	9.3
1955	18	9.3
1956	4	9.3
1957	11	9.3
1958	7	9.3
1959	12	9.3
1960	7	9.9
1961	21	9.9
1962	2	9.9
1963	9	9.9
1964	18	9.9
1965	6	9.9
1966	10	9.9
1967	6	9.9
1968	4	9.9
1969	16	9.9
1970	31	21.8
1971	13	21.8
1972	18	21.8
1973	12	21.8
1974	16	21.8
1975	28	21.8
1976	41	21.8
1977	26	21.8
1978	22	21.8
1979	11	21.8
1980	36	19.3
1981	9	19.3
1982	8	19.3
1983	23	19.3
1984	17	19.3
1985	3	19.3
1986	14	19.3
1987	23	19.3
1988	41	19.3
1989	19	19.3
1990	13	15.2
1991	24	15.2
1992	6	15.2
1993	6	15.2
1994	5	15.2
1995	24	15.2
1996	12	15.2
1997	19	15.2
1998	23	15.2
1999	20	15.2
2000	16	20.7
2001	31	20.7
2002	26	20.7
2003	31	20.7
2004	11	20.7
2005	27	20.7
2006	22	20.7
2007	28	20.7
2008	7	20.7
2009	8	20.7
2010	15	16.9
2011	19	16.9
2012	24	16.9
2013	18	16.9
2014	6	16.9
2015	15	16.9
2016	14	16.9
2017	15	16.9
2018	24	16.9
2019	19	16.9
2020	19	23.2
2021	44	23.2
2022	10	23.2
2024	16	23.2
2025	23	23.2
2026	27	23.2

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

First to last qualifying date each year at Grand Rapids Forestry Lab
Year	First date	Last date
1916	1916-07-02	1916-08-20
1917	1917-06-10	1917-08-23
1918	1918-05-06	1918-08-11
1919	1919-05-26	1919-08-19
1920	1920-06-08	1920-08-27
1921	1921-06-16	1921-09-07
1922	1922-05-11	1922-09-07
1923	1923-05-24	1923-09-23
1924	1924-06-14	1924-08-29
1925	1925-05-19	1925-08-29
1926	1926-05-05	1926-08-28
1927	1927-06-27	1927-09-14
1928	1928-05-09	1928-08-14
1929	1929-06-16	1929-09-04
1930	1930-07-08	1930-08-31
1931	1931-05-15	1931-09-12
1932	1932-05-14	1932-09-09
1933	1933-06-01	1933-09-05
1934	1934-05-09	1934-08-18
1935	1935-07-03	1935-08-16
1936	1936-06-24	1936-09-23
1937	1937-06-23	1937-09-23
1938	1938-06-21	1938-09-22
1939	1939-05-30	1939-09-15
1940	1940-06-16	1940-09-19
1941	1941-06-17	1941-09-20
1942	1942-07-12	1942-08-21
1943	1943-06-18	1943-07-25
1944	1944-05-23	1944-08-11
1945	1945-06-22	1945-09-06
1946	1946-07-13	1946-08-02
1947	1947-07-03	1947-09-08
1948	1948-06-02	1948-09-17
1949	1949-05-03	1949-08-09
1950	1950-06-22	1950-08-16
1951	1951-07-23	1951-08-01
1952	1952-04-27	1952-08-14
1953	1953-06-12	1953-09-02
1954	1954-06-29	1954-08-24
1955	1955-06-29	1955-08-20
1956	1956-06-09	1956-06-12
1957	1957-07-02	1957-08-08
1958	1958-06-28	1958-08-11
1959	1959-05-02	1959-08-24
1960	1960-07-21	1960-09-06
1961	1961-06-11	1961-09-03
1962	1962-06-28	1962-08-27
1963	1963-06-24	1963-10-05
1964	1964-05-21	1964-08-05
1965	1965-07-22	1965-08-14
1966	1966-06-29	1966-08-27
1967	1967-07-20	1967-08-16
1968	1968-07-16	1968-08-07
1969	1969-05-27	1969-08-30
1970	1970-06-06	1970-09-06
1971	1971-05-15	1971-09-04
1972	1972-05-17	1972-08-30
1973	1973-06-09	1973-08-29
1974	1974-06-28	1974-08-19
1975	1975-05-20	1975-08-25
1976	1976-06-03	1976-09-12
1977	1977-04-10	1977-07-24
1978	1978-05-18	1978-09-07
1979	1979-06-15	1979-09-05
1980	1980-04-21	1980-09-08
1981	1981-07-05	1981-07-14
1982	1982-07-05	1982-08-18
1983	1983-06-26	1983-09-09
1984	1984-07-03	1984-09-20
1985	1985-06-09	1985-07-08
1986	1986-05-28	1986-07-30
1987	1987-04-19	1987-08-16
1988	1988-05-29	1988-08-17
1989	1989-06-20	1989-08-11
1990	1990-06-26	1990-09-01
1991	1991-05-12	1991-08-31
1992	1992-05-21	1992-08-10
1993	1993-06-12	1993-08-26
1994	1994-05-20	1994-08-25
1995	1995-06-05	1995-09-05
1996	1996-06-10	1996-08-25
1997	1997-05-31	1997-09-05
1998	1998-05-14	1998-09-18
1999	1999-05-29	1999-09-03
2000	2000-05-05	2000-09-18
2001	2001-05-15	2001-09-06
2002	2002-05-29	2002-09-08
2003	2003-06-15	2003-10-07
2004	2004-06-07	2004-09-03
2005	2005-06-19	2005-09-11
2006	2006-05-25	2006-08-27
2007	2007-05-14	2007-09-05
2008	2008-07-01	2008-09-01
2009	2009-05-20	2009-08-14
2010	2010-05-23	2010-08-30
2011	2011-06-06	2011-09-11
2012	2012-05-18	2012-09-04
2013	2013-05-14	2013-09-06
2014	2014-05-24	2014-07-21
2015	2015-06-09	2015-10-11
2016	2016-05-05	2016-08-23
2017	2017-06-02	2017-08-01
2018	2018-05-07	2018-09-16
2019	2019-06-06	2019-09-16
2020	2020-06-09	2020-08-23
2021	2021-05-17	2021-09-30
2022	2022-06-14	2022-09-01
2024	2024-06-04	2024-09-28
2025	2025-05-11	2025-10-04
2026	2026-05-25	2026-09-06

Every Fixed Threshold

Fixed thresholds at Grand Rapids Forestry Lab
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	110	46	1923	27
35 C (95 F): Days	38	11	1936	2
40 C (104 F): Days	1	3	1936	3
90 F (32.2 C): Days	99	25	2021	12
100 F (37.8 C): Days	9	6	1936	1
0 C (32 F): Ice days (max	110	122	1955	51
0 C (32 F): Frost days (min	110	230	1917	115
-10 C (14 F): Days with min	110	131	1937	54
-20 C (-4 F): Days with min	110	82	1916	25
-30 C (-22 F): Days with min	106	41	1916	5
-40 C (-40 F): Days with min	26	4	1996	1
20 C (68 F): Tropical nights (min	64	7	1931	5
25 C (77 F): Days with min	3	1	1927	1
10 mm (0.39 in): Days with 10 mm or more rain	110	29	2015	17
25 mm (0.98 in): Days with 25 mm or more rain	108	11	1999	5
50 mm (1.97 in): Days with 50 mm or more rain	56	4	1953	1
100 mm (3.94 in): Days with 100 mm or more rain	7	1	1937	1
10 cm (3.9 in): Days with 10 cm or more snowfall	70	11	1955	2
25 cm (9.8 in): Days with 25 cm or more snowfall	13	2	1965	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1916.

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Data for Grand Rapids Forestry Lab 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).

Grand Rapids Forestry Lab Threshold Days by Year (USC00213303)

Key Facts for Grand Rapids Forestry Lab Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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