Harrow (Pine Hills) Threshold Days by Year

3 fixed thresholds counted per year at Harrow (Pine Hills) (ASN00079022): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Harrow (Pine Hills) Thresholds

Harrow (Pine Hills): days with 10 mm (0.39 in) or more of precipitation in 99 years, most in 1974 with 30.
Harrow (Pine Hills): days with 25 mm (0.98 in) or more of precipitation in 85 years, most in 1906 with 6.
Harrow (Pine Hills): days with 50 mm (1.97 in) or more of precipitation in 15 years, most in 1906 with 2.
3 fixed thresholds have at least one qualifying day at Harrow (Pine Hills).

Days with 10 mm (0.39 in) or more of precipitation

99 years with a qualifying day

Days per year at Harrow (Pine Hills) with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 30 in 1974.

Days with 10 mm (0.39 in) or more of precipitation per year at Harrow (Pine Hills)
Year	Days	Decade average
1885	10	17.4
1886	21	17.4
1887	18	17.4
1888	11	17.4
1889	27	17.4
1890	18	15
1891	14	15
1892	16	15
1893	21	15
1896	11	15
1897	13	15
1898	12	15
1900	17	15.6
1901	20	15.6
1902	7	15.6
1903	17	15.6
1904	10	15.6
1905	13	15.6
1906	28	15.6
1907	13	15.6
1908	11	15.6
1909	20	15.6
1910	18	12.6
1911	16	12.6
1912	8	12.6
1913	11	12.6
1914	3	12.6
1915	16	12.6
1916	12	12.6
1917	12	12.6
1918	18	12.6
1919	12	12.6
1920	23	15.7
1921	18	15.7
1922	18	15.7
1923	19	15.7
1924	14	15.7
1925	8	15.7
1926	12	15.7
1927	12	15.7
1928	19	15.7
1929	14	15.7
1930	17	15.2
1931	11	15.2
1932	15	15.2
1933	20	15.2
1934	12	15.2
1935	16	15.2
1936	17	15.2
1937	16	15.2
1938	10	15.2
1939	18	15.2
1940	10	17.9
1941	22	17.9
1942	22	17.9
1943	15	17.9
1944	14	17.9
1945	16	17.9
1946	24	17.9
1947	29	17.9
1948	16	17.9
1949	11	17.9
1950	17	17.9
1951	23	17.9
1952	24	17.9
1953	26	17.9
1954	14	17.9
1955	22	17.9
1956	22	17.9
1957	10	17.9
1958	14	17.9
1959	7	17.9
1960	22	15
1961	12	15
1962	15	15
1963	14	15
1964	21	15
1965	13	15
1966	13	15
1967	8	15
1968	16	15
1969	16	15
1970	15	19.9
1971	15	19.9
1972	14	19.9
1973	25	19.9
1974	30	19.9
1975	26	19.9
1977	14	19.9
1978	21	19.9
1979	19	19.9
1983	22	17.3
1984	17	17.3
1985	12	17.3
1986	20	17.3
1987	17	17.3
1988	22	17.3
1989	11	17.3
2003	16	16

For each year, a bar from the first to the last day at Harrow (Pine Hills) meeting 10 mm (0.39 in).

First to last qualifying date each year at Harrow (Pine Hills)
Year	First date	Last date
1885	1885-01-05	1885-12-23
1886	1886-01-06	1886-11-24
1887	1887-01-14	1887-11-30
1888	1888-04-09	1888-10-03
1889	1889-01-01	1889-12-20
1890	1890-01-21	1890-11-25
1891	1891-03-29	1891-12-16
1892	1892-03-21	1892-12-14
1893	1893-03-31	1893-11-19
1896	1896-01-17	1896-12-27
1897	1897-01-09	1897-10-19
1898	1898-02-26	1898-12-06
1900	1900-03-01	1900-12-02
1901	1901-01-14	1901-12-30
1902	1902-02-25	1902-12-17
1903	1903-03-09	1903-11-29
1904	1904-01-03	1904-11-02
1905	1905-01-03	1905-12-03
1906	1906-02-28	1906-11-28
1907	1907-02-06	1907-12-27
1908	1908-02-08	1908-10-17
1909	1909-02-24	1909-10-03
1910	1910-03-06	1910-12-23
1911	1911-02-05	1911-12-13
1912	1912-06-24	1912-09-18
1913	1913-02-14	1913-12-23
1914	1914-04-21	1914-12-15
1915	1915-05-17	1915-09-20
1916	1916-01-28	1916-11-23
1917	1917-02-15	1917-10-05
1918	1918-01-14	1918-10-27
1919	1919-02-03	1919-12-28
1920	1920-03-06	1920-12-17
1921	1921-01-02	1921-11-27
1922	1922-01-07	1922-12-24
1923	1923-05-21	1923-12-14
1924	1924-02-15	1924-11-23
1925	1925-04-21	1925-11-19
1926	1926-04-05	1926-10-07
1927	1927-03-18	1927-12-09
1928	1928-01-27	1928-11-04
1929	1929-01-29	1929-12-28
1930	1930-02-21	1930-12-16
1931	1931-03-13	1931-09-14
1932	1932-02-05	1932-12-15
1933	1933-03-04	1933-12-04
1934	1934-04-03	1934-11-30
1935	1935-01-05	1935-12-02
1936	1936-01-10	1936-12-15
1937	1937-01-02	1937-12-11
1938	1938-02-21	1938-11-03
1939	1939-01-16	1939-12-05
1940	1940-01-05	1940-12-31
1941	1941-01-25	1941-11-18
1942	1942-01-20	1942-11-21
1943	1943-01-22	1943-12-17
1944	1944-04-23	1944-12-27
1945	1945-02-18	1945-12-27
1946	1946-01-18	1946-12-29
1947	1947-02-04	1947-12-23
1948	1948-04-11	1948-12-25
1949	1949-01-16	1949-11-22
1950	1950-02-15	1950-12-19
1951	1951-02-20	1951-12-10
1952	1952-01-25	1952-12-07
1953	1953-01-13	1953-12-07
1954	1954-01-28	1954-12-24
1955	1955-02-11	1955-11-11
1956	1956-03-06	1956-12-19
1957	1957-02-07	1957-12-25
1958	1958-05-15	1958-10-08
1959	1959-01-25	1959-09-14
1960	1960-01-04	1960-11-21
1961	1961-04-07	1961-12-17
1962	1962-02-20	1962-10-09
1963	1963-01-14	1963-10-28
1964	1964-02-07	1964-11-22
1965	1965-05-16	1965-12-07
1966	1966-02-14	1966-12-04
1967	1967-01-15	1967-12-30
1968	1968-03-29	1968-11-06
1969	1969-02-10	1969-12-24
1970	1970-03-20	1970-12-31
1971	1971-03-15	1971-12-10
1972	1972-01-08	1972-10-11
1973	1973-01-31	1973-12-30
1974	1974-01-14	1974-10-31
1975	1975-03-15	1975-11-17
1977	1977-01-16	1977-11-29
1978	1978-01-23	1978-11-11
1979	1979-01-20	1979-11-15
1983	1983-03-02	1983-12-30
1984	1984-03-13	1984-11-11
1985	1985-03-16	1985-12-07
1986	1986-01-16	1986-12-12
1987	1987-01-03	1987-12-02
1988	1988-01-01	1988-10-10
1989	1989-02-13	1989-10-13
2003	2003-01-30	2003-12-22

Every Fixed Threshold

Fixed thresholds at Harrow (Pine Hills)
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
10 mm (0.39 in): Days with 10 mm or more rain	99	30	1974	16
25 mm (0.98 in): Days with 25 mm or more rain	85	6	1906	2
50 mm (1.97 in): Days with 50 mm or more rain	15	2	1906	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1885.

Download the Data

Data for Harrow (Pine Hills) 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 2026-10-16 (16 October 2026). Threshold counts are computed by this site.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Harrow (Pine Hills) Threshold Days by Year

Key Facts for Harrow (Pine Hills) Thresholds

Days with 10 mm (0.39 in) or more of precipitation

Every Fixed Threshold

Download the Data

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