Last updated: August 23, 2025
In Aya, Japan, the average temperature for December hovers around 8°C (47°F). Expect to feel a range from a chilly -2°C (28°F) to a comfortable 22°C (72°F). Be prepared for 71 mm (2.8 in) of precipitation over the month, typically spread across 7 days, and with an average humidity level of 74%, it’s a time where you might want to pack a light jacket and an umbrella!
In December in Aya, the average temperature is 8°C (47°F). The maximum can reach 22°C (72°F), while the minimum can be as low as -2°C (28°F). Be prepared for a range of weather conditions, making it ideal for travelers who enjoy both mild and chilly experiences.
In Aya in December, the precipitation amount is 71 mm (2.8 in) over a span of 7 days.
In Aya in December humidity is 74%. With an average temperature of 8°C (47°F), this humidity feels like a damp chill that seeps into your bones, making every outdoor excursion feel more invigorating yet slightly uncomfortable, as the moisture in the air intensifies the cold and leaves you yearning for warmer layers.
In Aya in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Aya for better planning.
UV Risk Categories
Weather in Aya varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Aya, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 6°C (44°F) | 55 mm (2.2 inches) | 72% | moderate |
| February Weather | 8°C (46°F) | 101 mm (4.0 inches) | 68% | high |
| March Weather | 12°C (53°F) | 176 mm (6.9 inches) | 72% | very high |
| April Weather | 15°C (60°F) | 141 mm (5.6 inches) | 79% | very high |
| May Weather | 19°C (67°F) | 225 mm (8.9 inches) | 83% | extreme |
| June Weather | 22°C (72°F) | 321 mm (12.6 inches) | 86% | extreme |
| July Weather | 26°C (79°F) | 388 mm (15.3 inches) | 90% | extreme |
| August Weather | 27°C (81°F) | 247 mm (9.7 inches) | 85% | extreme |
| September Weather | 24°C (76°F) | 319 mm (12.5 inches) | 80% | extreme |
| October Weather | 19°C (67°F) | 202 mm (8.0 inches) | 78% | very high |
| November Weather | 14°C (57°F) | 87 mm (3.4 inches) | 76% | high |
| December Weather | 8°C (47°F) | 71 mm (2.8 inches) | 74% | moderate |