Philadelphia Shawmont Threshold Days by Year (USC00366904)
17 fixed thresholds counted per year at Philadelphia Shawmont (USC00366904): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Philadelphia Shawmont Thresholds
- Philadelphia Shawmont: days with 10 mm (0.39 in) or more of precipitation in 55 years, most in 1945 with 54.
- Philadelphia Shawmont: days with 25 mm (0.98 in) or more of precipitation in 55 years, most in 1945 with 19.
- Philadelphia Shawmont: days with 50 mm (1.97 in) or more of precipitation in 50 years, most in 1952 with 7.
- Philadelphia Shawmont: days with a maximum temperature at or above 30 C (86 F) in 38 years, most in 1900 with 80.
- 17 fixed thresholds have at least one qualifying day at Philadelphia Shawmont.
Days at or above 30 C (86 F)
38 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1899 | 69 | 69 |
| 1900 | 80 | 80 |
| 1917 | 52 | 52 |
| 1921 | 58 | 40.9 |
| 1922 | 44 | 40.9 |
| 1923 | 43 | 40.9 |
| 1924 | 30 | 40.9 |
| 1925 | 52 | 40.9 |
| 1926 | 25 | 40.9 |
| 1927 | 18 | 40.9 |
| 1928 | 43 | 40.9 |
| 1929 | 55 | 40.9 |
| 1930 | 70 | 62.8 |
| 1931 | 65 | 62.8 |
| 1932 | 70 | 62.8 |
| 1933 | 58 | 62.8 |
| 1934 | 59 | 62.8 |
| 1935 | 49 | 62.8 |
| 1936 | 70 | 62.8 |
| 1937 | 67 | 62.8 |
| 1938 | 51 | 62.8 |
| 1939 | 69 | 62.8 |
| 1940 | 49 | 59.2 |
| 1941 | 69 | 59.2 |
| 1942 | 60 | 59.2 |
| 1943 | 77 | 59.2 |
| 1944 | 69 | 59.2 |
| 1945 | 56 | 59.2 |
| 1946 | 52 | 59.2 |
| 1947 | 59 | 59.2 |
| 1948 | 42 | 59.2 |
| 1950 | 39 | 58.1 |
| 1951 | 58 | 58.1 |
| 1952 | 62 | 58.1 |
| 1953 | 72 | 58.1 |
| 1954 | 60 | 58.1 |
| 1955 | 65 | 58.1 |
| 1956 | 51 | 58.1 |
| Year | First date | Last date |
|---|---|---|
| 1899 | 1899-05-03 | 1899-09-09 |
| 1900 | 1900-05-14 | 1900-09-13 |
| 1917 | 1917-06-21 | 1917-09-03 |
| 1921 | 1921-05-22 | 1921-09-29 |
| 1922 | 1922-06-07 | 1922-10-05 |
| 1923 | 1923-06-02 | 1923-09-05 |
| 1924 | 1924-06-19 | 1924-09-02 |
| 1925 | 1925-05-23 | 1925-09-14 |
| 1926 | 1926-07-01 | 1926-09-26 |
| 1927 | 1927-06-29 | 1927-09-16 |
| 1928 | 1928-05-04 | 1928-09-13 |
| 1929 | 1929-04-07 | 1929-09-10 |
| 1930 | 1930-05-05 | 1930-09-27 |
| 1931 | 1931-05-19 | 1931-09-23 |
| 1932 | 1932-05-16 | 1932-09-20 |
| 1933 | 1933-05-20 | 1933-09-27 |
| 1934 | 1934-05-06 | 1934-08-25 |
| 1935 | 1935-05-28 | 1935-08-22 |
| 1936 | 1936-05-08 | 1936-09-13 |
| 1937 | 1937-05-22 | 1937-09-06 |
| 1938 | 1938-06-07 | 1938-09-05 |
| 1939 | 1939-05-07 | 1939-10-10 |
| 1940 | 1940-05-14 | 1940-09-22 |
| 1941 | 1941-04-14 | 1941-10-07 |
| 1942 | 1942-04-06 | 1942-09-20 |
| 1943 | 1943-05-07 | 1943-09-16 |
| 1944 | 1944-05-13 | 1944-09-04 |
| 1945 | 1945-03-29 | 1945-09-29 |
| 1946 | 1946-05-25 | 1946-10-07 |
| 1947 | 1947-05-13 | 1947-10-21 |
| 1948 | 1948-05-11 | 1948-09-18 |
| 1950 | 1950-06-07 | 1950-09-02 |
| 1951 | 1951-05-16 | 1951-10-06 |
| 1952 | 1952-06-04 | 1952-09-14 |
| 1953 | 1953-05-10 | 1953-09-30 |
| 1954 | 1954-05-31 | 1954-10-14 |
| 1955 | 1955-05-05 | 1955-09-05 |
| 1956 | 1956-05-13 | 1956-09-23 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 38 | 80 | 1900 | 51 |
| 35 C (95 F): Days | 34 | 20 | 1955 | 4 |
| 40 C (104 F): Days | 1 | 1 | 1936 | 1 |
| 90 F (32.2 C): Days | 38 | 55 | 1900 | 23 |
| 100 F (37.8 C): Days | 9 | 6 | 1953 | 2 |
| 0 C (32 F): Ice days (max | 38 | 31 | 1900 | 5 |
| 0 C (32 F): Frost days (min | 38 | 136 | 1900 | 92 |
| -10 C (14 F): Days with min | 38 | 29 | 1900 | 2 |
| -20 C (-4 F): Days with min | 4 | 4 | 1899 | 2 |
| 20 C (68 F): Tropical nights (min | 38 | 53 | 1917 | 24 |
| 25 C (77 F): Days with min | 18 | 11 | 1917 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 55 | 54 | 1945 | 35 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 55 | 19 | 1945 | 8 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 50 | 7 | 1952 | 2 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 7 | 1 | 1900 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 23 | 3 | 1928 | 2 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 3 | 2 | 1938 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1899.
Download the Data
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 . Last revised (2025-12-31).