Last updated: June 24, 2025
In West Yarmouth, United States, the average temperature in December hovers around 4°C (40°F), with a minimum dipping to -12°C (11°F) and a maximum reaching 15°C (60°F). Be prepared for 136 mm (5.4 in) of precipitation spread over 12 days, contributing to an average humidity of 80%.
In December in West Yarmouth, the average temperature is 4°C (40°F). Maximums can reach 15°C (60°F), and minimums can drop as low as -12°C (11°F). Travelers should be prepared for chilly conditions, with the possibility of warmer days interspersed among colder spells.
In West Yarmouth in December, the total precipitation amount reaches 136 mm (5.4 in) over the course of 12 days.
In West Yarmouth in December, humidity is 80%. With an average temperature of 4°C (40°F), this humidity feels like a damp chill that seeps into your bones, making travel uncomfortable and requiring careful planning for warmth and moisture management.
In West Yarmouth 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 West Yarmouth, you can visit Hourly UV Index in West Yarmouth.
UV Risk Categories
Weather in West Yarmouth varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in West Yarmouth, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 2°C (36°F) | 94 mm (3.7 inches) | 84% | moderate |
| February Weather | 2°C (36°F) | 123 mm (4.8 inches) | 84% | moderate |
| March Weather | 3°C (38°F) | 118 mm (4.7 inches) | 82% | high |
| April Weather | 7°C (46°F) | 137 mm (5.4 inches) | 79% | very high |
| May Weather | 12°C (53°F) | 119 mm (4.7 inches) | 75% | very high |
| June Weather | 17°C (63°F) | 91 mm (3.6 inches) | 78% | very high |
| July Weather | 21°C (71°F) | 83 mm (3.3 inches) | 76% | very high |
| August Weather | 22°C (72°F) | 82 mm (3.2 inches) | 76% | very high |
| September Weather | 19°C (67°F) | 118 mm (4.7 inches) | 75% | very high |
| October Weather | 15°C (59°F) | 175 mm (6.9 inches) | 75% | high |
| November Weather | 9°C (48°F) | 102 mm (4.0 inches) | 80% | moderate |
| December Weather | 4°C (40°F) | 136 mm (5.4 inches) | 80% | low |