Rock Rapids Threshold Days by Year (USC00137147)

20 fixed thresholds counted per year at Rock Rapids (USC00137147): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Rock Rapids Thresholds

Rock Rapids: days with a maximum temperature at or above 30 C (86 F) in 122 years, most in 1895 with 84.
Rock Rapids: days with a maximum temperature at or above 90 F (32.2 C) in 122 years, most in 1894 with 66.
Rock Rapids: days with a maximum temperature at or below 0 C (32 F) in 122 years, most in 1975 with 90.
Rock Rapids: nights with a minimum temperature at or below 0 C (32 F) in 120 years, most in 1907 with 197.
20 fixed thresholds have at least one qualifying day at Rock Rapids.

Days at or above 30 C (86 F)

122 years with a qualifying day

Days per year at Rock Rapids with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 84 in 1895.

Days at or above 30 C (86 F) per year at Rock Rapids
Year	Days	Decade average
1894	82	69.5
1895	84	69.5
1896	48	69.5
1897	64	69.5
1904	20	34.5
1905	39	34.5
1907	32	34.5
1909	47	34.5
1911	55	42.6
1912	39	42.6
1914	49	42.6
1915	14	42.6
1916	58	42.6
1917	31	42.6
1918	45	42.6
1919	50	42.6
1920	36	42
1921	61	42
1922	46	42
1923	43	42
1924	21	42
1925	60	42
1926	53	42
1927	35	42
1928	30	42
1929	35	42
1930	50	61.2
1931	76	61.2
1932	47	61.2
1933	58	61.2
1934	63	61.2
1935	61	61.2
1936	78	61.2
1937	58	61.2
1938	59	61.2
1939	62	61.2
1940	49	41.5
1941	57	41.5
1942	24	41.5
1943	41	41.5
1944	32	41.5
1945	29	41.5
1946	36	41.5
1947	54	41.5
1948	46	41.5
1949	47	41.5
1950	20	41.3
1951	12	41.3
1952	47	41.3
1953	43	41.3
1954	37	41.3
1955	58	41.3
1956	53	41.3
1957	38	41.3
1958	47	41.3
1959	58	41.3
1960	39	40.8
1961	38	40.8
1962	25	40.8
1963	50	40.8
1964	53	40.8
1965	35	40.8
1966	47	40.8
1967	37	40.8
1968	43	40.8
1970	57	51
1971	44	51
1972	39	51
1973	52	51
1974	40	51
1975	54	51
1976	80	51
1977	44	51
1978	52	51
1979	48	51
1980	66	52.9
1981	46	52.9
1982	39	52.9
1983	74	52.9
1984	41	52.9
1985	46	52.9
1986	52	52.9
1987	51	52.9
1988	77	52.9
1989	37	52.9
1990	51	37.4
1991	47	37.4
1992	14	37.4
1993	23	37.4
1994	32	37.4
1995	44	37.4
1996	24	37.4
1997	45	37.4
1998	52	37.4
1999	42	37.4
2000	51	47.3
2001	47	47.3
2002	69	47.3
2003	52	47.3
2004	36	47.3
2005	49	47.3
2006	52	47.3
2007	59	47.3
2008	34	47.3
2009	24	47.3
2010	51	42.3
2011	47	42.3
2012	71	42.3
2013	45	42.3
2014	21	42.3
2015	29	42.3
2016	39	42.3
2017	40	42.3
2018	47	42.3
2019	33	42.3
2020	52	52.4
2021	55	52.4
2022	60	52.4
2023	58	52.4
2024	39	52.4
2025	47	52.4
2026	56	52.4

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

First to last qualifying date each year at Rock Rapids
Year	First date	Last date
1894	1894-05-13	1894-09-28
1895	1895-04-24	1895-09-20
1896	1896-05-07	1896-09-08
1897	1897-05-06	1897-10-06
1904	1904-05-20	1904-09-17
1905	1905-06-01	1905-10-05
1907	1907-05-12	1907-09-20
1909	1909-05-05	1909-09-13
1911	1911-05-09	1911-09-16
1912	1912-06-24	1912-09-08
1914	1914-05-26	1914-09-05
1915	1915-05-11	1915-09-03
1916	1916-05-05	1916-09-05
1917	1917-05-17	1917-09-16
1918	1918-05-03	1918-08-27
1919	1919-05-28	1919-09-07
1920	1920-06-07	1920-09-25
1921	1921-05-21	1921-09-02
1922	1922-06-04	1922-10-04
1923	1923-05-27	1923-08-25
1924	1924-05-05	1924-08-30
1925	1925-05-19	1925-09-18
1926	1926-04-29	1926-09-01
1927	1927-06-08	1927-09-14
1928	1928-05-08	1928-10-11
1929	1929-06-15	1929-09-03
1930	1930-06-02	1930-10-10
1931	1931-04-08	1931-09-19
1932	1932-05-13	1932-09-18
1933	1933-05-18	1933-09-18
1934	1934-04-30	1934-10-11
1935	1935-06-12	1935-09-24
1936	1936-05-05	1936-09-22
1937	1937-06-19	1937-09-22
1938	1938-06-05	1938-10-04
1939	1939-04-23	1939-10-06
1940	1940-05-12	1940-09-22
1941	1941-05-14	1941-09-20
1942	1942-05-29	1942-09-10
1943	1943-03-30	1943-09-02
1944	1944-05-14	1944-09-17
1945	1945-06-22	1945-09-07
1946	1946-04-17	1946-09-05
1947	1947-06-26	1947-10-05
1948	1948-05-19	1948-09-19
1949	1949-04-25	1949-08-26
1950	1950-05-23	1950-10-30
1951	1951-07-15	1951-10-01
1952	1952-05-02	1952-09-30
1953	1953-05-25	1953-10-02
1954	1954-04-14	1954-09-26
1955	1955-05-19	1955-09-18
1956	1956-05-12	1956-10-12
1957	1957-05-07	1957-08-31
1958	1958-05-10	1958-10-15
1959	1959-05-01	1959-09-08
1960	1960-04-22	1960-09-07
1961	1961-06-09	1961-09-09
1962	1962-04-24	1962-08-27
1963	1963-05-07	1963-10-06
1964	1964-04-16	1964-09-09
1965	1965-04-29	1965-08-26
1966	1966-05-04	1966-09-10
1967	1967-03-24	1967-10-03
1968	1968-03-30	1968-09-13
1970	1970-04-29	1970-09-21
1971	1971-06-04	1971-09-14
1972	1972-05-17	1972-09-20
1973	1973-05-22	1973-08-31
1974	1974-05-21	1974-09-27
1975	1975-05-18	1975-10-14
1976	1976-05-20	1976-10-04
1977	1977-04-10	1977-09-09
1978	1978-05-25	1978-09-12
1979	1979-05-29	1979-09-10
1980	1980-04-21	1980-10-10
1981	1981-04-26	1981-09-30
1982	1982-06-24	1982-09-05
1983	1983-05-28	1983-09-29
1984	1984-06-21	1984-09-20
1985	1985-04-18	1985-09-19
1986	1986-05-31	1986-09-01
1987	1987-04-18	1987-10-05
1988	1988-04-08	1988-09-18
1989	1989-04-22	1989-09-18
1990	1990-04-23	1990-10-06
1991	1991-04-06	1991-09-08
1992	1992-05-01	1992-10-03
1993	1993-06-11	1993-10-08
1994	1994-04-19	1994-09-15
1995	1995-06-07	1995-09-05
1996	1996-05-18	1996-09-05
1997	1997-05-18	1997-10-07
1998	1998-05-18	1998-09-30
1999	1999-05-29	1999-09-26
2000	2000-05-05	2000-10-02
2001	2001-05-10	2001-10-03
2002	2002-04-16	2002-10-01
2003	2003-04-15	2003-10-20
2004	2004-04-18	2004-09-20
2005	2005-06-07	2005-10-04
2006	2006-04-14	2006-10-04
2007	2007-04-30	2007-10-07
2008	2008-06-19	2008-09-27
2009	2009-04-24	2009-09-19
2010	2010-05-23	2010-10-09
2011	2011-05-11	2011-10-05
2012	2012-04-02	2012-09-12
2013	2013-05-14	2013-09-28
2014	2014-05-28	2014-09-20
2015	2015-05-04	2015-10-12
2016	2016-05-07	2016-09-24
2017	2017-05-09	2017-09-25
2018	2018-05-17	2018-10-04
2019	2019-06-01	2019-10-01
2020	2020-06-02	2020-09-23
2021	2021-04-06	2021-09-29
2022	2022-05-12	2022-09-21
2023	2023-04-13	2023-10-03
2024	2024-05-18	2024-09-30
2025	2025-05-11	2025-10-05
2026	2026-03-22	2026-10-12

Every Fixed Threshold

Fixed thresholds at Rock Rapids
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	122	84	1895	56
35 C (95 F): Days	112	41	1936	3
40 C (104 F): Days	15	15	1936	5
90 F (32.2 C): Days	122	66	1894	25
100 F (37.8 C): Days	48	28	1936	1
110 F (43.3 C): Days	1	3	1936	3
0 C (32 F): Ice days (max	122	90	1975	34
0 C (32 F): Frost days (min	120	197	1907	99
-10 C (14 F): Days with min	120	102	1895	33
-20 C (-4 F): Days with min	120	51	1985	9
-30 C (-22 F): Days with min	66	11	1936	3
-40 C (-40 F): Days with min	1	1	1912	1
20 C (68 F): Tropical nights (min	119	33	1955	25
25 C (77 F): Days with min	13	1	1911	1
10 mm (0.39 in): Days with 10 mm or more rain	119	39	2019	20
25 mm (0.98 in): Days with 25 mm or more rain	118	14	1944	9
50 mm (1.97 in): Days with 50 mm or more rain	73	5	2001	1
100 mm (3.94 in): Days with 100 mm or more rain	9	2	2010	2
10 cm (3.9 in): Days with 10 cm or more snowfall	96	6	2010	2
25 cm (9.8 in): Days with 25 cm or more snowfall	12	1	1917	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1894.

Download the Data

Data for Rock Rapids 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).

Rock Rapids Threshold Days by Year (USC00137147)

Key Facts for Rock Rapids Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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