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December Weather in Harleston, United Kingdom

Last updated: August 27, 2025

In December, the average temperature in Harleston, United Kingdom hovers around 6°C (43°F), with fluctuations between a chilly -2°C (29°F) and a mild 15°C (59°F). Expect 80 mm (3.1 in) of precipitation spread across 15 days, contributing to a high average humidity of 88%. Be prepared for cool, damp days as you explore!

December Temperature in Harleston

In December in Harleston, the average temperature is 6°C (43°F). Maximum temperatures can reach 15°C (59°F), while minimums can drop as low as -2°C (29°F). Travelers should be prepared for a mix of cool and chilly weather during this time.

December Weather in Harleston: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Harleston, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Harleston, December typically has an average temperature of 6°C (43°F), with highs reaching up to 15°C (59°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec404245485461646459534643
Data source: Temperature data for Harleston generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Harleston

In Harleston in December, the precipitation amount is 80 mm (3.1 in) over a span of 15 days.

December Precipitation Trends in Harleston

The chart displays monthly precipitation patterns in Harleston, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Harleston, December typically receives around 80 mm (3.1 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec485555316170717959794580
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Harleston

In Harleston in December, humidity is 88%. With an average temperature of 6°C (43°F), this humidity feels like a damp chill that seeps into your bones, making traveling uncomfortable and prompting you to seek warm shelter frequently.

December Average Humidity in Harleston

This chart illustrates the average monthly humidity levels in Harleston, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Harleston is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%87%86%85%83%83%80%78%84%88%89%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Harleston

In Harleston 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 Harleston.

Maximum UV Index Levels in Harleston for December

The chart shows the monthly maximum UV Index (UVI) for Harleston in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Harleston typically reaches 1, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578875321
Data source: Harleston December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How December Weather in Harleston Compares to Other Months

Weather in Harleston varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Harleston, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Harleston, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)48 mm (1.9 inches)89%low
February Weather6°C (43°F)55 mm (2.2 inches)87%low
March Weather7°C (45°F)55 mm (2.2 inches)86%moderate
April Weather9°C (48°F)31 mm (1.2 inches)85%moderate
May Weather12°C (54°F)61 mm (2.4 inches)83%high
June Weather16°C (61°F)70 mm (2.7 inches)83%very high
July Weather18°C (64°F)71 mm (2.8 inches)79%very high
August Weather18°C (64°F)79 mm (3.1 inches)78%high
September Weather15°C (59°F)59 mm (2.3 inches)84%moderate
October Weather12°C (54°F)79 mm (3.1 inches)88%moderate
November Weather8°C (47°F)45 mm (1.8 inches)89%low
December Weather6°C (43°F)80 mm (3.1 inches)88%low

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