Last updated: June 24, 2025
In December, the average temperature in East Harwich, United States hovers around 5°C (41°F). Temperatures can dip as low as -10°C (14°F), while reaching a pleasant maximum of 15°C (60°F). Expect about 138 mm (5.4 in) of precipitation spread over 12 days, contributing to an average humidity of 80%. Be prepared for a mix of chilly and damp conditions!
In December in East Harwich, the average temperature is 5°C (41°F), with a maximum that can reach 15°C (60°F) and a minimum that can drop as low as -10°C (14°F). Travelers should be prepared for a wide range of temperatures and dress accordingly.
In East Harwich in December, the precipitation amount is 138 mm (5.4 in) spread over a period of 12 days.
In East Harwich in December humidity is 80%. With an average temperature of 5°C (41°F), this humidity feels like a damp chill that seeps into your bones, making outdoor exploration feel much colder than it actually is, leading to the necessity of layering up to stay comfortable while traveling.
In East Harwich in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in East Harwich, you can visit Hourly UV Index in East Harwich.
UV Risk Categories
Weather in East Harwich varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in East Harwich, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 2°C (37°F) | 94 mm (3.7 inches) | 84% | moderate |
| February Weather | 2°C (37°F) | 124 mm (4.9 inches) | 84% | moderate |
| March Weather | 3°C (38°F) | 119 mm (4.7 inches) | 82% | high |
| April Weather | 7°C (45°F) | 131 mm (5.1 inches) | 79% | very high |
| May Weather | 11°C (52°F) | 121 mm (4.8 inches) | 75% | very high |
| June Weather | 16°C (61°F) | 88 mm (3.5 inches) | 78% | very high |
| July Weather | 20°C (69°F) | 77 mm (3.0 inches) | 76% | very high |
| August Weather | 21°C (71°F) | 83 mm (3.3 inches) | 76% | very high |
| September Weather | 19°C (66°F) | 116 mm (4.6 inches) | 75% | very high |
| October Weather | 15°C (59°F) | 169 mm (6.7 inches) | 75% | high |
| November Weather | 9°C (49°F) | 106 mm (4.2 inches) | 80% | moderate |
| December Weather | 5°C (41°F) | 138 mm (5.4 inches) | 80% | low |