Chestnut Hill Threshold Days by Year (USC00191447)

18 fixed thresholds counted per year at Chestnut Hill (USC00191447): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Chestnut Hill Thresholds

Chestnut Hill: nights with a minimum temperature at or below 0 C (32 F) in 89 years, most in 1919 with 167.
Chestnut Hill: nights with a minimum temperature at or below -10 C (14 F) in 89 years, most in 1904 with 59.
Chestnut Hill: nights with a minimum temperature at or above 20 C (68 F) in 89 years, most in 1955 with 28.
Chestnut Hill: days with 10 mm (0.39 in) or more of precipitation in 89 years, most in 1983 with 50.
18 fixed thresholds have at least one qualifying day at Chestnut Hill.

Days at or above 30 C (86 F)

86 years with a qualifying day

Days per year at Chestnut Hill with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 57 in 1952.

Days at or above 30 C (86 F) per year at Chestnut Hill
Year	Days	Decade average
1893	35	38.1
1894	46	38.1
1895	43	38.1
1896	40	38.1
1897	27	38.1
1898	39	38.1
1899	37	38.1
1900	43	31.7
1901	34	31.7
1902	21	31.7
1903	21	31.7
1904	19	31.7
1905	27	31.7
1906	36	31.7
1907	38	31.7
1908	47	31.7
1909	31	31.7
1910	36	27.2
1911	35	27.2
1912	26	27.2
1913	29	27.2
1914	28	27.2
1915	24	27.2
1916	19	27.2
1917	25	27.2
1918	24	27.2
1919	26	27.2
1920	25	27.5
1921	30	27.5
1922	29	27.5
1923	28	27.5
1924	33	27.5
1925	30	27.5
1926	23	27.5
1927	19	27.5
1928	33	27.5
1929	25	27.5
1930	31	33.7
1931	28	33.7
1932	24	33.7
1933	37	33.7
1934	37	33.7
1935	31	33.7
1937	39	33.7
1938	34	33.7
1939	42	33.7
1940	21	38.3
1941	44	38.3
1942	39	38.3
1943	39	38.3
1944	48	38.3
1945	35	38.3
1946	24	38.3
1947	45	38.3
1948	37	38.3
1949	51	38.3
1950	20	35.9
1951	37	35.9
1952	57	35.9
1953	47	35.9
1954	26	35.9
1955	53	35.9
1956	32	35.9
1957	40	35.9
1958	11	35.9
1959	36	35.9
1960	13	25.2
1961	24	25.2
1962	13	25.2
1963	21	25.2
1964	21	25.2
1965	37	25.2
1966	39	25.2
1967	21	25.2
1969	38	25.2
1970	16	25.4
1971	35	25.4
1972	12	25.4
1973	31	25.4
1975	30	25.4
1977	27	25.4
1979	27	25.4
1981	19	24.8
1982	19	24.8
1983	40	24.8
1984	21	24.8

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

First to last qualifying date each year at Chestnut Hill
Year	First date	Last date
1893	1893-05-12	1893-08-28
1894	1894-05-02	1894-09-25
1895	1895-05-04	1895-09-26
1896	1896-04-16	1896-09-12
1897	1897-06-23	1897-10-16
1898	1898-06-08	1898-10-04
1899	1899-05-01	1899-08-31
1900	1900-05-15	1900-09-12
1901	1901-05-22	1901-09-07
1902	1902-05-23	1902-09-02
1903	1903-05-17	1903-09-16
1904	1904-05-26	1904-09-12
1905	1905-06-10	1905-08-24
1906	1906-05-16	1906-09-19
1907	1907-06-18	1907-09-21
1908	1908-05-26	1908-09-11
1909	1909-06-03	1909-08-26
1910	1910-05-24	1910-10-06
1911	1911-05-11	1911-08-23
1912	1912-05-24	1912-09-11
1913	1913-06-07	1913-09-02
1914	1914-04-19	1914-09-24
1915	1915-06-14	1915-09-18
1916	1916-07-07	1916-09-14
1917	1917-06-20	1917-08-29
1918	1918-05-07	1918-08-24
1919	1919-05-29	1919-09-09
1920	1920-05-28	1920-09-26
1921	1921-05-21	1921-09-03
1922	1922-06-04	1922-10-02
1923	1923-04-21	1923-09-01
1924	1924-06-22	1924-09-03
1925	1925-06-03	1925-09-12
1926	1926-06-25	1926-09-26
1927	1927-04-19	1927-10-02
1928	1928-06-14	1928-10-12
1929	1929-05-28	1929-09-07
1930	1930-05-02	1930-09-26
1931	1931-05-05	1931-09-22
1932	1932-05-16	1932-09-12
1933	1933-05-19	1933-08-28
1934	1934-05-05	1934-08-20
1935	1935-04-27	1935-08-21
1937	1937-05-30	1937-09-05
1938	1938-04-20	1938-09-01
1939	1939-05-28	1939-10-10
1940	1940-06-04	1940-08-18
1941	1941-04-20	1941-09-23
1942	1942-05-03	1942-09-17
1943	1943-06-03	1943-09-16
1944	1944-05-04	1944-09-15
1945	1945-06-14	1945-09-09
1946	1946-05-25	1946-08-10
1947	1947-05-13	1947-10-17
1948	1948-06-24	1948-09-19
1949	1949-05-04	1949-09-05
1950	1950-06-07	1950-08-30
1951	1951-05-15	1951-09-14
1952	1952-06-04	1952-09-29
1953	1953-05-10	1953-10-04
1954	1954-04-20	1954-10-14
1955	1955-05-23	1955-09-19
1956	1956-05-31	1956-10-16
1957	1957-04-21	1957-09-16
1958	1958-06-30	1958-08-31
1959	1959-05-12	1959-09-25
1960	1960-06-17	1960-09-09
1961	1961-06-13	1961-09-13
1962	1962-04-27	1962-08-07
1963	1963-06-24	1963-10-08
1964	1964-05-23	1964-09-12
1965	1965-05-10	1965-09-24
1966	1966-05-27	1966-09-03
1967	1967-06-04	1967-08-19
1969	1969-05-17	1969-09-18
1970	1970-05-10	1970-09-24
1971	1971-06-08	1971-09-10
1972	1972-05-29	1972-08-27
1973	1973-06-10	1973-09-05
1975	1975-05-21	1975-08-23
1977	1977-04-23	1977-09-04
1979	1979-05-10	1979-09-06
1981	1981-05-26	1981-09-15
1982	1982-07-08	1982-08-18
1983	1983-06-14	1983-09-21
1984	1984-05-27	1984-08-17

Every Fixed Threshold

Fixed thresholds at Chestnut Hill
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	86	57	1952	21
35 C (95 F): Days	59	12	1949	4
40 C (104 F): Days	2	1	1894	1
90 F (32.2 C): Days	86	35	1955	13
100 F (37.8 C): Days	12	5	1911	1
0 C (32 F): Ice days (max	86	58	1904	27
0 C (32 F): Frost days (min	89	167	1919	146
-10 C (14 F): Days with min	89	59	1904	39
-20 C (-4 F): Days with min	43	8	1904	5
20 C (68 F): Tropical nights (min	89	28	1955	5
25 C (77 F): Days with min	15	4	1948	1
10 mm (0.39 in): Days with 10 mm or more rain	89	50	1983	35
25 mm (0.98 in): Days with 25 mm or more rain	89	22	1983	6
50 mm (1.97 in): Days with 50 mm or more rain	78	10	1901	2
100 mm (3.94 in): Days with 100 mm or more rain	14	3	1955	1
10 cm (3.9 in): Days with 10 cm or more snowfall	34	7	1945	4
25 cm (9.8 in): Days with 25 cm or more snowfall	15	3	1945	1
50 cm (19.7 in): Days with 50 cm or more snowfall	1	1	1969	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1893.

Download the Data

Data for Chestnut Hill 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).

Chestnut Hill Threshold Days by Year (USC00191447)

Key Facts for Chestnut Hill Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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