Last updated: June 24, 2025
In Shell Valley, United States, the average temperature in December hovers around -10°C (15°F). The weather can swing from a chilling minimum of -38°C (-35°F) to a mild maximum of 8°C (47°F). Expect precipitation to amount to 22 mm (0.9 in) over about 6 days, with an average humidity soaring to 91%.
In December in Shell Valley, the average temperature is -10°C (15°F), with maximums reaching 8°C (47°F) and minimums plummeting to -38°C (-35°F). It is advisable to prepare for severe cold conditions and dress warmly if you plan to travel during this time.
In Shell Valley in December, the precipitation amount is 22 mm (0.9 in) over a span of 6 days.
In Shell Valley in December humidity is 91%. With an average temperature of -10°C (15°F), this humidity feels like an eerie chill that penetrates your bones, making outdoor travel uncomfortable and increasing the risk of frostbite, even with layers of clothing.
In Shell Valley 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 Shell Valley, you can visit Hourly UV Index in Shell Valley.
UV Risk Categories
Weather in Shell Valley varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Shell Valley, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -13°C (8°F) | 14 mm (0.6 inches) | 92% | low |
| February Weather | -15°C (5°F) | 16 mm (0.6 inches) | 90% | moderate |
| March Weather | -5°C (24°F) | 24 mm (1.0 inches) | 88% | moderate |
| April Weather | 2°C (36°F) | 23 mm (0.9 inches) | 81% | very high |
| May Weather | 11°C (53°F) | 40 mm (1.6 inches) | 74% | very high |
| June Weather | 18°C (65°F) | 81 mm (3.2 inches) | 72% | very high |
| July Weather | 20°C (69°F) | 63 mm (2.5 inches) | 74% | very high |
| August Weather | 18°C (65°F) | 70 mm (2.8 inches) | 76% | very high |
| September Weather | 13°C (56°F) | 73 mm (2.9 inches) | 73% | high |
| October Weather | 4°C (40°F) | 47 mm (1.9 inches) | 76% | moderate |
| November Weather | -4°C (24°F) | 26 mm (1.0 inches) | 86% | low |
| December Weather | -10°C (15°F) | 22 mm (0.9 inches) | 91% | low |