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December Weather in Hartley, United Kingdom

Last updated: August 27, 2025

In December, the average temperature in Hartley, United Kingdom hovers around 6°C (44°F). Expect the mercury to dip as low as -3°C (27°F) or rise to a pleasant 14°C (58°F). Be prepared for 85 mm (3.4 in) of precipitation over approximately 13 days, resulting in a notably high average humidity of 92%.

December Temperature in Hartley

In December in Hartley, the average temperature is 6°C (44°F). The maximum can reach 14°C (58°F), while the minimum can drop as low as -3°C (27°F). Be prepared for a range of temperatures and pack accordingly for your travels.

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

The chart illustrates December temperature patterns in Hartley, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hartley, December typically has an average temperature of 6°C (44°F), with highs reaching up to 14°C (58°F) and lows dropping to around -3°C (27°F).
JanFebMarAprMayJunJulAugSepOctNovDec414346495562656459544744
Data source: Temperature data for Hartley 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 Hartley

In Hartley in December, the total precipitation amount is 85 mm (3.4 in), which occurs over the span of 13 days.

December Precipitation Trends in Hartley

The chart displays monthly precipitation patterns in Hartley, 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 Hartley, December typically receives around 85 mm (3.4 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec525252316375627146804885
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Hartley

In Hartley in December, humidity is 92%. With an average temperature of 6°C (44°F), this humidity feels like a damp chill that clings to your skin, making outdoor explorations uncomfortable and leaving you longing for warmer, drier conditions.

December Average Humidity in Hartley

This chart illustrates the average monthly humidity levels in Hartley, 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 Hartley is approximately 92%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%86%85%82%81%76%73%80%89%92%92%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Hartley

In Hartley 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 Hartley.

Maximum UV Index Levels in Hartley for December

The chart shows the monthly maximum UV Index (UVI) for Hartley 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 Hartley typically reaches 1, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578875421
Data source: Hartley 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 Hartley Compares to Other Months

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

This table compares monthly weather conditions in Hartley, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)52 mm (2.1 inches)91%low
February Weather6°C (43°F)52 mm (2.1 inches)89%low
March Weather8°C (46°F)52 mm (2.0 inches)86%moderate
April Weather10°C (49°F)31 mm (1.2 inches)85%moderate
May Weather13°C (55°F)63 mm (2.5 inches)82%high
June Weather17°C (62°F)75 mm (3.0 inches)81%very high
July Weather18°C (65°F)62 mm (2.4 inches)76%very high
August Weather18°C (64°F)71 mm (2.8 inches)73%high
September Weather15°C (60°F)46 mm (1.8 inches)80%moderate
October Weather12°C (54°F)80 mm (3.1 inches)89%moderate
November Weather8°C (47°F)48 mm (1.9 inches)92%low
December Weather6°C (44°F)85 mm (3.4 inches)92%low

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