Harrow Cda Threshold Days by Year (CA006133360)

16 fixed thresholds counted per year at Harrow Cda (CA006133360): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Harrow Cda Thresholds

Harrow Cda: days with a maximum temperature at or above 30 C (86 F) in 66 years, most in 1944 with 58.
Harrow Cda: days with a maximum temperature at or below 0 C (32 F) in 66 years, most in 1960 with 80.
Harrow Cda: nights with a minimum temperature at or below 0 C (32 F) in 66 years, most in 1926 with 163.
Harrow Cda: nights with a minimum temperature at or below -10 C (14 F) in 66 years, most in 1978 with 61.
16 fixed thresholds have at least one qualifying day at Harrow Cda.

Days at or above 30 C (86 F)

66 years with a qualifying day

Days per year at Harrow Cda with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 58 in 1944.

Days at or above 30 C (86 F) per year at Harrow Cda
Year	Days	Decade average
1918	35	37
1919	39	37
1920	15	23.7
1921	43	23.7
1922	25	23.7
1923	26	23.7
1924	19	23.7
1925	31	23.7
1926	19	23.7
1927	14	23.7
1928	23	23.7
1929	22	23.7
1930	33	34.5
1931	39	34.5
1932	22	34.5
1933	49	34.5
1934	46	34.5
1935	23	34.5
1936	45	34.5
1937	26	34.5
1938	32	34.5
1939	30	34.5
1940	19	34.9
1941	40	34.9
1942	25	34.9
1943	34	34.9
1944	58	34.9
1945	27	34.9
1946	40	34.9
1947	35	34.9
1948	30	34.9
1949	41	34.9
1950	28	24.8
1951	27	24.8
1952	46	24.8
1953	40	24.8
1954	27	24.8
1955	42	24.8
1956	8	24.8
1957	9	24.8
1958	2	24.8
1959	19	24.8
1960	10	15.5
1961	12	15.5
1962	16	15.5
1963	19	15.5
1964	31	15.5
1965	13	15.5
1966	17	15.5
1967	11	15.5
1968	16	15.5
1969	10	15.5
1970	14	12.5
1971	11	12.5
1972	9	12.5
1973	17	12.5
1974	14	12.5
1975	13	12.5
1976	13	12.5
1977	13	12.5
1978	17	12.5
1979	4	12.5
1980	13	14.3
1981	8	14.3
1982	7	14.3
1983	29	14.3

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

First to last qualifying date each year at Harrow Cda
Year	First date	Last date
1918	1918-05-22	1918-08-27
1919	1919-06-02	1919-09-10
1920	1920-06-10	1920-09-26
1921	1921-05-22	1921-09-11
1922	1922-06-07	1922-09-10
1923	1923-06-01	1923-09-03
1924	1924-06-20	1924-08-31
1925	1925-05-23	1925-09-11
1926	1926-05-07	1926-08-16
1927	1927-06-25	1927-09-17
1928	1928-07-07	1928-09-11
1929	1929-05-29	1929-09-04
1930	1930-04-10	1930-09-14
1931	1931-05-29	1931-09-21
1932	1932-05-25	1932-09-19
1933	1933-05-24	1933-09-08
1934	1934-05-19	1934-08-19
1935	1935-07-04	1935-09-18
1936	1936-05-09	1936-09-23
1937	1937-05-31	1937-09-04
1938	1938-06-22	1938-09-04
1939	1939-05-31	1939-10-08
1940	1940-06-07	1940-09-20
1941	1941-05-05	1941-09-16
1942	1942-04-30	1942-09-15
1943	1943-06-04	1943-09-02
1944	1944-05-26	1944-09-05
1945	1945-06-23	1945-09-08
1946	1946-06-11	1946-10-06
1947	1947-06-10	1947-09-19
1948	1948-06-03	1948-09-19
1949	1949-05-04	1949-08-27
1950	1950-06-07	1950-08-28
1951	1951-05-15	1951-10-05
1952	1952-05-05	1952-10-01
1953	1953-06-04	1953-09-04
1954	1954-06-09	1954-09-05
1955	1955-05-03	1955-09-19
1956	1956-06-10	1956-07-27
1957	1957-06-16	1957-08-09
1958	1958-07-02	1958-07-10
1959	1959-06-08	1959-09-09
1960	1960-06-04	1960-09-08
1961	1961-06-12	1961-09-13
1962	1962-05-14	1962-08-04
1963	1963-05-09	1963-09-19
1964	1964-05-22	1964-09-10
1965	1965-06-06	1965-08-15
1966	1966-05-27	1966-09-02
1967	1967-05-27	1967-07-24
1968	1968-06-07	1968-08-24
1969	1969-05-29	1969-08-31
1970	1970-05-22	1970-09-21
1971	1971-06-19	1971-09-08
1972	1972-06-14	1972-07-23
1973	1973-06-10	1973-09-04
1974	1974-07-03	1974-08-20
1975	1975-05-19	1975-08-02
1976	1976-06-08	1976-09-08
1977	1977-05-13	1977-07-20
1978	1978-06-27	1978-09-20
1979	1979-06-15	1979-08-07
1980	1980-05-05	1980-08-08
1981	1981-06-15	1981-07-18
1982	1982-07-07	1982-09-13
1983	1983-06-12	1983-09-10

Every Fixed Threshold

Fixed thresholds at Harrow Cda
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	66	58	1944	29
35 C (95 F): Days	31	10	1936	2
40 C (104 F): Days	2	1	1918	1
90 F (32.2 C): Days	62	38	1944	6
100 F (37.8 C): Days	3	4	1936	1
0 C (32 F): Ice days (max	66	80	1960	48
0 C (32 F): Frost days (min	66	163	1926	123
-10 C (14 F): Days with min	66	61	1978	22
-20 C (-4 F): Days with min	41	10	1918	4
20 C (68 F): Tropical nights (min	66	40	1921	38
25 C (77 F): Days with min	9	2	1942	1
10 mm (0.39 in): Days with 10 mm or more rain	65	41	1957	33
25 mm (0.98 in): Days with 25 mm or more rain	62	12	1981	7
50 mm (1.97 in): Days with 50 mm or more rain	18	2	1962	1
10 cm (3.9 in): Days with 10 cm or more snowfall	57	5	1921	1
25 cm (9.8 in): Days with 25 cm or more snowfall	9	3	1982	3

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1918.

Download the Data

Data for Harrow Cda 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).

Harrow Cda Threshold Days by Year (CA006133360)

Key Facts for Harrow Cda Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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