Philadelphia City Threshold Days by Year (USW00013779)

17 fixed thresholds counted per year at Philadelphia City (USW00013779): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Philadelphia City Thresholds

Philadelphia City: days with a maximum temperature at or above 30 C (86 F) in 110 years, most in 1983 with 80.
Philadelphia City: days with a maximum temperature at or above 90 F (32.2 C) in 110 years, most in 1983 with 54.
Philadelphia City: days with a maximum temperature at or below 0 C (32 F) in 110 years, most in 1875 with 38.
Philadelphia City: nights with a minimum temperature at or below 0 C (32 F) in 110 years, most in 1904 with 115.
17 fixed thresholds have at least one qualifying day at Philadelphia City.

Days at or above 30 C (86 F)

110 years with a qualifying day

Days per year at Philadelphia City with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 80 in 1983.

Days at or above 30 C (86 F) per year at Philadelphia City
Year	Days	Decade average
1874	34	30.7
1875	17	30.7
1876	39	30.7
1877	30	30.7
1878	30	30.7
1879	34	30.7
1880	51	39
1881	49	39
1882	32	39
1883	27	39
1884	40	39
1885	41	39
1886	32	39
1887	49	39
1888	42	39
1889	27	39
1890	32	43.3
1891	36	43.3
1892	41	43.3
1893	39	43.3
1894	52	43.3
1895	57	43.3
1896	49	43.3
1897	33	43.3
1898	50	43.3
1899	44	43.3
1900	66	36.6
1901	46	36.6
1902	30	36.6
1903	27	36.6
1904	26	36.6
1905	31	36.6
1906	36	36.6
1907	27	36.6
1908	39	36.6
1909	38	36.6
1910	32	37.4
1911	47	37.4
1912	36	37.4
1913	43	37.4
1914	43	37.4
1915	39	37.4
1916	36	37.4
1917	31	37.4
1918	34	37.4
1919	33	37.4
1920	29	36.4
1921	42	36.4
1922	34	36.4
1923	37	36.4
1924	31	36.4
1925	50	36.4
1926	31	36.4
1927	25	36.4
1928	38	36.4
1929	47	36.4
1930	66	51.2
1931	58	51.2
1932	57	51.2
1933	52	51.2
1934	52	51.2
1935	37	51.2
1936	42	51.2
1937	49	51.2
1938	45	51.2
1939	54	51.2
1940	32	45.1
1941	64	45.1
1942	38	45.1
1943	66	45.1
1944	57	45.1
1945	46	45.1
1946	31	45.1
1947	43	45.1
1948	28	45.1
1949	46	45.1
1950	31	47.3
1951	43	47.3
1952	50	47.3
1953	49	47.3
1954	38	47.3
1955	54	47.3
1956	37	47.3
1957	61	47.3
1958	37	47.3
1959	73	47.3
1960	38	51.8
1961	57	51.8
1962	49	51.8
1963	54	51.8
1964	61	51.8
1974	36	40.3
1975	47	40.3
1976	50	40.3
1977	44	40.3
1978	35	40.3
1979	30	40.3
1980	72	54.1
1981	43	54.1
1982	37	54.1
1983	80	54.1
1984	52	54.1
1985	52	54.1
1986	56	54.1
1987	55	54.1
1988	59	54.1
1989	35	54.1
1990	45	44.7
1991	63	44.7
1992	26	44.7

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

First to last qualifying date each year at Philadelphia City
Year	First date	Last date
1874	1874-05-10	1874-09-12
1875	1875-05-22	1875-09-04
1876	1876-06-03	1876-09-01
1877	1877-05-17	1877-08-29
1878	1878-06-27	1878-09-19
1879	1879-05-31	1879-10-03
1880	1880-05-09	1880-09-20
1881	1881-05-11	1881-10-01
1882	1882-06-15	1882-09-20
1883	1883-06-05	1883-08-23
1884	1884-05-02	1884-09-11
1885	1885-04-22	1885-08-25
1886	1886-05-23	1886-09-28
1887	1887-05-04	1887-09-07
1888	1888-04-29	1888-08-31
1889	1889-05-09	1889-09-06
1890	1890-06-04	1890-09-05
1891	1891-05-10	1891-10-04
1892	1892-06-13	1892-09-05
1893	1893-05-21	1893-09-19
1894	1894-05-02	1894-09-16
1895	1895-05-09	1895-09-26
1896	1896-04-16	1896-09-19
1897	1897-06-15	1897-10-16
1898	1898-05-20	1898-09-19
1899	1899-05-02	1899-09-08
1900	1900-05-13	1900-10-06
1901	1901-06-06	1901-09-15
1902	1902-05-23	1902-09-08
1903	1903-04-30	1903-09-14
1904	1904-05-24	1904-09-12
1905	1905-06-06	1905-10-01
1906	1906-05-17	1906-09-21
1907	1907-03-29	1907-09-21
1908	1908-05-13	1908-08-19
1909	1909-05-15	1909-08-29
1910	1910-05-24	1910-09-06
1911	1911-05-11	1911-09-03
1912	1912-05-21	1912-09-11
1913	1913-05-02	1913-09-08
1914	1914-05-20	1914-09-23
1915	1915-04-25	1915-09-17
1916	1916-05-28	1916-10-09
1917	1917-05-20	1917-08-29
1918	1918-05-06	1918-08-31
1919	1919-05-05	1919-10-03
1920	1920-06-02	1920-08-31
1921	1921-05-22	1921-09-30
1922	1922-04-10	1922-10-05
1923	1923-05-29	1923-08-21
1924	1924-06-21	1924-09-02
1925	1925-05-23	1925-09-13
1926	1926-06-14	1926-10-04
1927	1927-04-20	1927-10-02
1928	1928-05-04	1928-10-13
1929	1929-04-06	1929-09-10
1930	1930-05-05	1930-09-26
1931	1931-05-19	1931-09-23
1932	1932-05-16	1932-09-23
1933	1933-05-20	1933-09-27
1934	1934-05-05	1934-08-24
1935	1935-05-28	1935-08-22
1936	1936-05-08	1936-09-12
1937	1937-05-22	1937-09-04
1938	1938-04-28	1938-10-17
1939	1939-05-06	1939-10-10
1940	1940-05-14	1940-09-21
1941	1941-04-14	1941-10-07
1942	1942-04-06	1942-09-17
1943	1943-05-07	1943-09-07
1944	1944-05-13	1944-09-05
1945	1945-05-22	1945-09-29
1946	1946-05-25	1946-10-06
1947	1947-05-29	1947-10-21
1948	1948-05-11	1948-09-13
1949	1949-05-06	1949-09-05
1950	1950-06-07	1950-09-01
1951	1951-05-16	1951-10-05
1952	1952-06-04	1952-09-13
1953	1953-05-11	1953-09-30
1954	1954-06-01	1954-10-13
1955	1955-05-05	1955-08-23
1956	1956-05-13	1956-09-14
1957	1957-04-27	1957-09-22
1958	1958-05-31	1958-09-26
1959	1959-05-07	1959-10-06
1960	1960-04-23	1960-09-09
1961	1961-04-25	1961-09-25
1962	1962-04-22	1962-10-12
1963	1963-04-03	1963-09-27
1964	1964-04-18	1964-09-23
1974	1974-04-29	1974-09-13
1975	1975-05-20	1975-10-14
1976	1976-04-17	1976-09-14
1977	1977-04-12	1977-09-19
1978	1978-05-20	1978-09-18
1979	1979-05-09	1979-09-06
1980	1980-05-05	1980-09-23
1981	1981-05-22	1981-09-14
1982	1982-05-30	1982-09-13
1983	1983-04-28	1983-10-04
1984	1984-05-22	1984-10-21
1985	1985-04-19	1985-09-20
1986	1986-05-06	1986-09-30
1987	1987-05-10	1987-09-10
1988	1988-05-23	1988-09-23
1989	1989-05-18	1989-09-21
1990	1990-03-14	1990-09-11
1991	1991-04-08	1991-09-17
1992	1992-05-22	1992-09-09

Every Fixed Threshold

Fixed thresholds at Philadelphia City
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	110	80	1983	26
35 C (95 F): Days	95	20	1983	1
40 C (104 F): Days	2	1	1918	1
90 F (32.2 C): Days	110	54	1983	8
100 F (37.8 C): Days	20	5	1983	5
0 C (32 F): Ice days (max	110	38	1875	6
0 C (32 F): Frost days (min	110	115	1904	62
-10 C (14 F): Days with min	101	32	1875	2
-20 C (-4 F): Days with min	6	2	1899	1
20 C (68 F): Tropical nights (min	110	80	1991	38
25 C (77 F): Days with min	71	12	1955	6
10 mm (0.39 in): Days with 10 mm or more rain	87	48	1933	44
25 mm (0.98 in): Days with 25 mm or more rain	87	18	1902	15
50 mm (1.97 in): Days with 50 mm or more rain	69	5	1873	2
100 mm (3.94 in): Days with 100 mm or more rain	4	2	1977	2
10 cm (3.9 in): Days with 10 cm or more snowfall	51	5	1904	1
25 cm (9.8 in): Days with 25 cm or more snowfall	7	1	1888	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1874.

Download the Data

Data for Philadelphia City 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).

Philadelphia City Threshold Days by Year (USW00013779)

Key Facts for Philadelphia City Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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