Last updated: August 23, 2025
In December, the average temperature in Shiozawa, Japan hovers around 0°C (32°F). Expect chilly nights with minimums dropping to -14°C (7°F) and mild days reaching up to 18°C (65°F). The month sees 226 mm (8.9 in) of precipitation spread over 22 days, contributing to a notably high average humidity of 86%. Stay warm and prepared for the wet weather!
In December in Shiozawa, the average temperature is 0°C (32°F). The maximum can reach 18°C (65°F) and the minimum can be as low as -14°C (7°F). Travelers should prepare for a wide range of temperatures and dress in layers to stay comfortable during their visit.
In Shiozawa in December, the precipitation amount is 226 mm (8.9 in) over the course of 22 days.
In Shiozawa in December humidity is 86%. With an average temperature of 0°C (32°F), this humidity feels like a biting chill that seeps into your bones, making travel feel uncomfortable and damp, as the cold air combines with the moisture to create a brisk sensation that may deter outdoor exploration.
In Shiozawa in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Shiozawa, you can check the information here.
UV Risk Categories
Weather in Shiozawa varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Shiozawa, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (28°F) | 199 mm (7.8 inches) | 88% | moderate |
| February Weather | -2°C (29°F) | 185 mm (7.3 inches) | 86% | moderate |
| March Weather | 3°C (37°F) | 174 mm (6.9 inches) | 81% | very high |
| April Weather | 8°C (46°F) | 167 mm (6.6 inches) | 78% | very high |
| May Weather | 15°C (58°F) | 181 mm (7.1 inches) | 81% | very high |
| June Weather | 18°C (64°F) | 201 mm (7.9 inches) | 88% | extreme |
| July Weather | 22°C (73°F) | 376 mm (14.8 inches) | 92% | extreme |
| August Weather | 24°C (75°F) | 238 mm (9.4 inches) | 92% | extreme |
| September Weather | 19°C (67°F) | 223 mm (8.8 inches) | 89% | very high |
| October Weather | 13°C (56°F) | 256 mm (10.1 inches) | 87% | high |
| November Weather | 6°C (44°F) | 145 mm (5.7 inches) | 85% | moderate |
| December Weather | 0°C (32°F) | 226 mm (8.9 inches) | 86% | moderate |