Last updated: August 27, 2025
In December, the average temperature in Castlereagh, United Kingdom is a brisk 6°C (44°F), with temperatures ranging from a chilly -1°C (30°F) to a mild 13°C (56°F). Expect 91 mm (3.6 in) of precipitation spread over approximately 15 days, contributing to an ambiance of 86% humidity. Whether you're exploring the local scenery or cozying up indoors, be prepared for the cool, damp weather!
In December in Castlereagh, the average temperature is 6°C (44°F). The maximum can reach 13°C (56°F) and the minimum can be as low as -1°C (30°F). Be prepared for a mix of chilly days and slightly warmer moments, making it ideal for layering and enjoying crisp outdoor activities.
In Castlereagh in December, the total precipitation amount is 91 mm (3.6 in) over a span of 15 days.
In Castlereagh in December, humidity is 86%. With an average temperature of 6°C (44°F), this humidity feels like a damp chill that clings to your skin, making outdoor activities quite uncomfortable for traveling.
In Castlereagh in December, the maximum UV index is 1, which corresponds to a low Exposure Category. This means you have a time to burn of 45 minutes. For more details, you can check the Hourly UV Index in Castlereagh.
UV Risk Categories
Weather in Castlereagh varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Castlereagh, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 6°C (43°F) | 60 mm (2.3 inches) | 87% | low |
| February Weather | 6°C (43°F) | 89 mm (3.5 inches) | 86% | low |
| March Weather | 7°C (44°F) | 80 mm (3.2 inches) | 86% | moderate |
| April Weather | 8°C (47°F) | 45 mm (1.8 inches) | 85% | moderate |
| May Weather | 11°C (52°F) | 66 mm (2.6 inches) | 82% | high |
| June Weather | 14°C (57°F) | 78 mm (3.1 inches) | 84% | very high |
| July Weather | 15°C (60°F) | 84 mm (3.3 inches) | 86% | very high |
| August Weather | 15°C (59°F) | 115 mm (4.5 inches) | 86% | high |
| September Weather | 13°C (56°F) | 75 mm (3.0 inches) | 88% | moderate |
| October Weather | 11°C (52°F) | 92 mm (3.6 inches) | 89% | moderate |
| November Weather | 8°C (47°F) | 94 mm (3.7 inches) | 90% | low |
| December Weather | 6°C (44°F) | 91 mm (3.6 inches) | 86% | low |