NOAA's National Centers for Environmental Information
County Rankings
Chester County, Pennsylvania
December 1999 Average Temperature Rankings
| Period | Value | 1901-2000 Mean | Anomaly | Rank (1895-2025) | Coolest/Warmest Since | Record |
|---|---|---|---|---|---|---|
| December 1999 1-Month | 36.8°F (2.7°C) | 32.3°F (0.2°C) | 4.5°F | 111th Coolest | Coolest since: | 1989 |
| 20th Warmest | Warmest since: | 2015 | ||||
| Nov– 2-Month | 42.5°F (5.8°C) | 37.4°F (3.0°C) | 5.1°F | 123rd Coolest | Coolest since: | 1917 |
| 8th Warmest | Warmest since: | 2015 | ||||
| Oct– 3-Month | 45.8°F (7.7°C) | 42.9°F (6.1°C) | 2.9°F | 110th Coolest | Coolest since: | 1917 |
| 21st Warmest | Warmest since: | 2015 | ||||
| Sep– 4-Month | 50.9°F (10.5°C) | 48.4°F (9.1°C) | 2.5°F | 110th Coolest | Coolest since: | 1917 |
| 21st Warmest | Warmest since: | 2015 | ||||
| Aug– 5-Month | 55.5°F (13.1°C) | 53.1°F (11.7°C) | 2.4°F | 112th Coolest | Coolest since: | 1917 |
| 19th Warmest | Warmest since: | 2015 | ||||
| Jul– 6-Month | 59.4°F (15.2°C) | 56.6°F (13.7°C) | 2.8°F | 120th Coolest | Coolest since: | 1917 |
| 11th Warmest | Warmest since: | 2015 | ||||
| Jun– 7-Month | 61.0°F (16.1°C) | 58.3°F (14.6°C) | 2.7°F | 118th Coolest | Coolest since: | 1917 |
| 13th Warmest | Warmest since: | 2015 | ||||
| May– 8-Month | 61.0°F (16.1°C) | 58.6°F (14.8°C) | 2.4°F | 116th Coolest | Coolest since: | 1917 |
| 15th Warmest | Warmest since: | 2015 | ||||
| Apr– 9-Month | 59.9°F (15.5°C) | 57.7°F (14.3°C) | 2.2°F | 113th Coolest | Coolest since: | 1917 |
| 18th Warmest | Warmest since: | 2015 | ||||
| Mar– 10-Month | 57.9°F (14.4°C) | 55.9°F (13.3°C) | 2.0°F | 114th Coolest | Coolest since: | 1917 |
| 17th Warmest | Warmest since: | 2011 | ||||
| Feb– 11-Month | 55.8°F (13.2°C) | 53.6°F (12.0°C) | 2.2°F | 112th Coolest | Coolest since: | 1904 |
| 19th Warmest | Warmest since: | 2012, 2024 | ||||
| Jan– 12-Month | 53.8°F (12.1°C) | 51.5°F (10.8°C) | 2.3°F | 115th Coolest | Coolest since: | 1904 |
| 16th Warmest | Warmest since: | 2012 | ||||
| Jul 1998– 18-Month | 55.7°F (13.2°C) | 53.2°F (11.8°C) | 2.5°F | 115th Coolest | Coolest since: | 1904 |
| 15th Warmest | Warmest since: | 2012 | ||||
| Ties: 1998 | ||||||
| Jan 1998– 24-Month | 54.5°F (12.5°C) | 51.5°F (10.8°C) | 3.0°F | 124th Coolest | Coolest since: | 1905 |
| 6th Warmest | Warmest to Date | 2012, 2024 | ||||
| Jan 1997– 36-Month | 53.6°F (12.0°C) | 51.5°F (10.8°C) | 2.1°F | 113th Coolest | Coolest since: | 1905 |
| 16th Warmest | Warmest to Date | 2012 | ||||
| Jan 1996– 48-Month | 53.0°F (11.7°C) | 51.5°F (10.8°C) | 1.5°F | 103rd Coolest | Coolest since: | 1907 |
| 25th Warmest | Warmest since: | 2023, 2024 | ||||
| Jan 1995– 60-Month | 52.9°F (11.6°C) | 51.5°F (10.8°C) | 1.4°F | 102nd Coolest | Coolest since: | 1907 |
| 25th Warmest | Warmest to Date | 2024 | ||||
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
