Last updated: August 27, 2025
In December, the average temperature in Radlett, United Kingdom hovers around 6°C (43°F), with a possible minimum of -5°C (23°F) and a maximum reaching 14°C (58°F). Prepare for 83 mm (3.3 in) of precipitation, typically spread over 14 days, and brace yourself for the high average humidity of 92%. Whether you're bundled up against the chill or navigating the rain, be ready for a month full of weather variety!
In December in Radlett, the average temperature is 6°C (43°F). Maximums can reach 14°C (58°F), while minimums can drop to as low as -5°C (23°F). Be sure to pack warm layers and prepare for variable weather if you plan to travel during this time.
In Radlett in December, the precipitation amount is 83 mm (3.3 in) spread over a period of 14 days.
In Radlett in December humidity is 92%. With an average temperature of 6°C (43°F), this humidity feels like a damp chill that seeps through your clothes, making outdoor activities uncomfortable and requiring extra layers for warmth while navigating the slick streets.
In Radlett 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 Radlett.
UV Risk Categories
Weather in Radlett varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Radlett, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 5°C (41°F) | 54 mm (2.1 inches) | 91% | low |
| February Weather | 6°C (43°F) | 51 mm (2.0 inches) | 89% | low |
| March Weather | 7°C (45°F) | 56 mm (2.2 inches) | 86% | moderate |
| April Weather | 9°C (49°F) | 32 mm (1.3 inches) | 85% | moderate |
| May Weather | 13°C (55°F) | 65 mm (2.5 inches) | 79% | high |
| June Weather | 16°C (62°F) | 74 mm (2.9 inches) | 80% | very high |
| July Weather | 18°C (65°F) | 67 mm (2.6 inches) | 71% | very high |
| August Weather | 18°C (64°F) | 72 mm (2.8 inches) | 76% | high |
| September Weather | 15°C (59°F) | 49 mm (1.9 inches) | 82% | high |
| October Weather | 12°C (53°F) | 86 mm (3.4 inches) | 90% | moderate |
| November Weather | 8°C (46°F) | 51 mm (2.0 inches) | 92% | low |
| December Weather | 6°C (43°F) | 83 mm (3.3 inches) | 92% | low |