Castlewood Threshold Days by Year (USC00391519)

19 fixed thresholds counted per year at Castlewood (USC00391519): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Castlewood Thresholds

Castlewood: days with a maximum temperature at or above 30 C (86 F) in 97 years, most in 1976 with 73.
Castlewood: days with a maximum temperature at or below 0 C (32 F) in 97 years, most in 2008 with 106.
Castlewood: days with 10 mm (0.39 in) or more of precipitation in 97 years, most in 1984 with 32.
Castlewood: days with a maximum temperature at or above 90 F (32.2 C) in 95 years, most in 1976 with 57.
19 fixed thresholds have at least one qualifying day at Castlewood.

Days at or above 30 C (86 F)

97 years with a qualifying day

Days per year at Castlewood with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 73 in 1976.

Days at or above 30 C (86 F) per year at Castlewood
Year	Days	Decade average
1895	66	66
1906	14	20
1907	13	20
1908	27	20
1909	26	20
1910	37	28.2
1911	37	28.2
1912	18	28.2
1913	36	28.2
1914	31	28.2
1915	5	28.2
1916	41	28.2
1917	24	28.2
1918	26	28.2
1919	27	28.2
1920	19	29.8
1921	42	29.8
1922	47	29.8
1923	27	29.8
1924	11	29.8
1925	44	29.8
1926	37	29.8
1927	21	29.8
1928	19	29.8
1929	31	29.8
1930	46	56.3
1931	61	56.3
1932	40	56.3
1933	65	56.3
1934	63	56.3
1935	53	56.3
1936	69	56.3
1937	57	56.3
1938	51	56.3
1939	58	56.3
1940	42	29.3
1941	48	29.3
1942	12	29.3
1943	30	29.3
1944	18	29.3
1945	19	29.3
1946	36	29.3
1951	14	39.1
1952	49	39.1
1953	37	39.1
1954	36	39.1
1955	51	39.1
1956	26	39.1
1957	33	39.1
1958	43	39.1
1959	63	39.1
1960	41	36.4
1961	42	36.4
1962	23	36.4
1963	33	36.4
1964	52	36.4
1965	24	36.4
1966	39	36.4
1967	40	36.4
1969	34	36.4
1970	65	48.7
1971	45	48.7
1972	33	48.7
1973	49	48.7
1974	52	48.7
1975	45	48.7
1976	73	48.7
1977	40	48.7
1978	50	48.7
1979	35	48.7
1980	54	44.4
1981	36	44.4
1982	40	44.4
1983	70	44.4
1984	36	44.4
1985	33	44.4
1987	45	44.4
1988	56	44.4
1989	30	44.4
1990	28	16.1
1991	28	16.1
1992	9	16.1
1993	6	16.1
1994	9	16.1
1996	11	16.1
1997	17	16.1
1999	21	16.1
2000	22	22.9
2002	35	22.9
2003	30	22.9
2004	17	22.9
2005	32	22.9
2006	25	22.9
2007	22	22.9
2008	12	22.9
2009	11	22.9
2010	28	28

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

First to last qualifying date each year at Castlewood
Year	First date	Last date
1895	1895-05-08	1895-09-19
1906	1906-05-11	1906-09-10
1907	1907-06-16	1907-09-18
1908	1908-06-21	1908-09-22
1909	1909-05-05	1909-08-27
1910	1910-04-28	1910-10-16
1911	1911-05-09	1911-09-01
1912	1912-06-25	1912-09-08
1913	1913-04-30	1913-10-03
1914	1914-05-26	1914-08-31
1915	1915-07-12	1915-08-15
1916	1916-05-05	1916-09-05
1917	1917-05-16	1917-08-26
1918	1918-05-03	1918-09-08
1919	1919-05-29	1919-09-07
1920	1920-06-08	1920-09-21
1921	1921-06-10	1921-09-01
1922	1922-06-04	1922-10-04
1923	1923-06-01	1923-09-05
1924	1924-07-10	1924-08-29
1925	1925-05-19	1925-09-20
1926	1926-05-01	1926-09-01
1927	1927-06-19	1927-09-14
1928	1928-05-08	1928-10-10
1929	1929-06-10	1929-09-23
1930	1930-05-21	1930-09-23
1931	1931-04-12	1931-09-13
1932	1932-05-13	1932-09-30
1933	1933-05-18	1933-09-18
1934	1934-04-29	1934-09-13
1935	1935-06-13	1935-09-24
1936	1936-05-05	1936-09-23
1937	1937-05-28	1937-09-22
1938	1938-06-05	1938-10-03
1939	1939-04-23	1939-09-22
1940	1940-05-12	1940-09-19
1941	1941-05-14	1941-09-21
1942	1942-06-04	1942-09-10
1943	1943-05-28	1943-08-09
1944	1944-05-15	1944-08-12
1945	1945-06-22	1945-09-07
1946	1946-06-06	1946-09-06
1951	1951-07-14	1951-10-01
1952	1952-04-28	1952-09-30
1953	1953-05-29	1953-10-14
1954	1954-06-12	1954-09-01
1955	1955-05-02	1955-10-10
1956	1956-06-09	1956-09-27
1957	1957-07-02	1957-08-31
1958	1958-04-16	1958-10-14
1959	1959-05-01	1959-09-14
1960	1960-06-02	1960-09-20
1961	1961-06-08	1961-09-09
1962	1962-04-24	1962-08-28
1963	1963-05-07	1963-10-05
1964	1964-04-16	1964-09-09
1965	1965-05-02	1965-09-03
1966	1966-05-26	1966-10-07
1967	1967-05-22	1967-10-01
1969	1969-05-26	1969-09-14
1970	1970-05-07	1970-10-06
1971	1971-05-14	1971-09-13
1972	1972-05-16	1972-09-20
1973	1973-06-09	1973-09-02
1974	1974-05-20	1974-09-27
1975	1975-05-19	1975-09-02
1976	1976-06-05	1976-10-03
1977	1977-04-09	1977-09-09
1978	1978-05-25	1978-09-12
1979	1979-05-28	1979-09-17
1980	1980-04-20	1980-10-09
1981	1981-04-27	1981-09-12
1982	1982-05-03	1982-09-11
1983	1983-05-27	1983-09-27
1984	1984-07-02	1984-09-20
1985	1985-04-17	1985-09-08
1987	1987-04-20	1987-09-27
1988	1988-05-13	1988-09-18
1989	1989-06-07	1989-08-23
1990	1990-04-23	1990-09-27
1991	1991-04-07	1991-09-07
1992	1992-05-01	1992-10-03
1993	1993-07-31	1993-10-07
1994	1994-06-15	1994-09-15
1996	1996-06-12	1996-09-06
1997	1997-06-24	1997-10-03
1999	1999-06-05	1999-08-28
2000	2000-05-05	2000-09-30
2002	2002-05-29	2002-09-16
2003	2003-04-14	2003-10-19
2004	2004-04-28	2004-09-19
2005	2005-06-07	2005-09-12
2006	2006-05-24	2006-08-18
2007	2007-05-14	2007-10-07
2008	2008-07-02	2008-09-27
2009	2009-04-24	2009-08-15
2010	2010-05-25	2010-10-09

Every Fixed Threshold

Fixed thresholds at Castlewood
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	97	73	1976	28
35 C (95 F): Days	81	35	1936	2
40 C (104 F): Days	11	13	1936	3
90 F (32.2 C): Days	95	57	1976	13
100 F (37.8 C): Days	28	21	1936	1
0 C (32 F): Ice days (max	97	106	2008	92
0 C (32 F): Frost days (min	95	209	1907	165
-10 C (14 F): Days with min	95	114	2008	85
-20 C (-4 F): Days with min	95	56	1916	33
-30 C (-22 F): Days with min	86	25	1936	8
-40 C (-40 F): Days with min	7	2	1994	1
20 C (68 F): Tropical nights (min	84	27	1941	5
25 C (77 F): Days with min	5	2	1939	1
10 mm (0.39 in): Days with 10 mm or more rain	97	32	1984	24
25 mm (0.98 in): Days with 25 mm or more rain	95	12	2007	8
50 mm (1.97 in): Days with 50 mm or more rain	48	3	1909	1
100 mm (3.94 in): Days with 100 mm or more rain	6	1	1931	1
10 cm (3.9 in): Days with 10 cm or more snowfall	52	5	1946	3
25 cm (9.8 in): Days with 25 cm or more snowfall	9	2	1997	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1895.

Download the Data

Data for Castlewood 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 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Castlewood Threshold Days by Year (USC00391519)

Key Facts for Castlewood Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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