NOAA's National Centers for Environmental Information
County Rankings
Chester County, Pennsylvania
December 1978 Average Temperature Rankings
| Period | Value | 1901-2000 Mean | Anomaly | Rank (1895-2025) | Coolest/Warmest Since | Record |
|---|---|---|---|---|---|---|
| December 1978 1-Month | 34.7°F (1.5°C) | 32.3°F (0.2°C) | 2.4°F | 83rd Coolest | Coolest since: | 1989 |
| 48th Warmest | Warmest since: | 2015 | ||||
| Nov– 2-Month | 39.5°F (4.2°C) | 37.4°F (3.0°C) | 2.1°F | 92nd Coolest | Coolest since: | 1917 |
| 39th Warmest | Warmest since: | 2015 | ||||
| Oct– 3-Month | 43.7°F (6.5°C) | 42.9°F (6.1°C) | 0.8°F | 79th Coolest | Coolest since: | 1917 |
| 52nd Warmest | Warmest since: | 2015 | ||||
| Ties: 1923, 1957 | ||||||
| Sep– 4-Month | 48.9°F (9.4°C) | 48.4°F (9.1°C) | 0.5°F | 73rd Coolest | Coolest since: | 1917 |
| 58th Warmest | Warmest since: | 2015 | ||||
| Aug– 5-Month | 53.9°F (12.2°C) | 53.1°F (11.7°C) | 0.8°F | 81st Coolest | Coolest since: | 1917 |
| 50th Warmest | Warmest since: | 2015 | ||||
| Ties: 1895, 1920 | ||||||
| Jul– 6-Month | 56.9°F (13.8°C) | 56.6°F (13.7°C) | 0.3°F | 69th Coolest | Coolest since: | 1917 |
| 62nd Warmest | Warmest since: | 2015 | ||||
| Ties: 1906, 1911, 1912, 1920, 1955, 1977 | ||||||
| Jun– 7-Month | 58.6°F (14.8°C) | 58.3°F (14.6°C) | 0.3°F | 58th Coolest | Coolest since: | 1917 |
| 73rd Warmest | Warmest since: | 2015 | ||||
| May– 8-Month | 58.6°F (14.8°C) | 58.6°F (14.8°C) | 0.0°F | 43rd Coolest | Coolest since: | 1917 |
| 88th Warmest | Warmest since: | 2015 | ||||
| Apr– 9-Month | 57.6°F (14.2°C) | 57.7°F (14.3°C) | -0.1°F | 43rd Coolest | Coolest since: | 1917 |
| 88th Warmest | Warmest since: | 2015 | ||||
| Ties: 1919, 1932, 1933, 1951 | ||||||
| Mar– 10-Month | 55.5°F (13.1°C) | 55.9°F (13.3°C) | -0.4°F | 32nd Coolest | Coolest since: | 1917 |
| 99th Warmest | Warmest since: | 2011 | ||||
| Feb– 11-Month | 52.4°F (11.3°C) | 53.6°F (12.0°C) | -1.2°F | 13th Coolest | Coolest since: | 1904 |
| 118th Warmest | Warmest since: | 2012, 2024 | ||||
| Ties: 1901, 1934, 1963, 1972 | ||||||
| Jan– 12-Month | 50.1°F (10.1°C) | 51.5°F (10.8°C) | -1.4°F | 8th Coolest | Coolest since: | 1904 |
| 123rd Warmest | Warmest since: | 2012 | ||||
| Ties: 1905 | ||||||
| Jul 1977– 18-Month | 52.4°F (11.3°C) | 53.2°F (11.8°C) | -0.8°F | 17th Coolest | Coolest since: | 1904 |
| 113th Warmest | Warmest since: | 2012 | ||||
| Ties: 1912, 1927, 1934 | ||||||
| Jan 1977– 24-Month | 50.9°F (10.5°C) | 51.5°F (10.8°C) | -0.6°F | 26th Coolest | Coolest since: | 1905 |
| 104th Warmest | Warmest since: | 2012, 2024 | ||||
| Ties: 1912, 1936 | ||||||
| Jan 1976– 36-Month | 50.9°F (10.5°C) | 51.5°F (10.8°C) | -0.6°F | 21st Coolest | Coolest since: | 1905 |
| 108th Warmest | Warmest since: | 2012 | ||||
| Ties: 1897, 1912, 1936, 1965, 1968, 1969 | ||||||
| Jan 1975– 48-Month | 51.3°F (10.7°C) | 51.5°F (10.8°C) | -0.2°F | 36th Coolest | Coolest since: | 1907 |
| 92nd Warmest | Warmest since: | 2023, 2024 | ||||
| Ties: 1898, 1902, 1914, 1942, 1961, 1962, 1972 | ||||||
| Jan 1974– 60-Month | 51.4°F (10.8°C) | 51.5°F (10.8°C) | -0.1°F | 47th Coolest | Coolest since: | 1907 |
| 80th Warmest | Warmest since: | 2024 | ||||
| Ties: 1925, 1936 | ||||||
Citing This Page
- NOAA National Centers for Environmental information, Climate at a Glance: County Rankings, published March 2025, retrieved on March 13, 2025 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/rankings
