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December Weather in Slough, United Kingdom

Last updated: August 27, 2025

In December, the average temperature in Slough, United Kingdom hovers around 6°C (44°F), with temperatures dipping as low as -4°C (24°F) and peaking at 14°C (58°F). Expect a fair amount of precipitation, totaling 82 mm (3.2 in) over 14 days, and brace yourself for a rather humid experience with an average humidity level of 92%.

December Temperature in Slough

In December in Slough, the average temperature is 6°C (44°F). The maximum can reach 14°C (58°F), and the minimum can be as low as -4°C (24°F). Be prepared for chilly weather and pack accordingly for your trip!

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

The chart illustrates December temperature patterns in Slough, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Slough, 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 -4°C (24°F).
JanFebMarAprMayJunJulAugSepOctNovDec414345495562656459534643
Data source: Temperature data for Slough 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 Slough

In Slough in December, the precipitation amount is 82 mm (3.2 in) spread over 14 days.

December Precipitation Trends in Slough

The chart displays monthly precipitation patterns in Slough, 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 Slough, December typically receives around 82 mm (3.2 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec525255336374646745865382
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Slough

In Slough 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 Slough

This chart illustrates the average monthly humidity levels in Slough, 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 Slough is approximately 92%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%86%85%79%81%71%76%82%91%92%92%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Slough

In Slough 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 Slough.

Maximum UV Index Levels in Slough for December

The chart shows the monthly maximum UV Index (UVI) for Slough 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 Slough typically reaches 1, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578876421
Data source: Slough 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 Slough Compares to Other Months

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

This table compares monthly weather conditions in Slough, 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 (2.0 inches)89%low
March Weather7°C (46°F)55 mm (2.2 inches)86%moderate
April Weather10°C (49°F)33 mm (1.3 inches)85%moderate
May Weather13°C (55°F)63 mm (2.5 inches)79%high
June Weather16°C (62°F)74 mm (2.9 inches)80%very high
July Weather18°C (65°F)64 mm (2.5 inches)71%very high
August Weather18°C (64°F)67 mm (2.6 inches)76%high
September Weather15°C (59°F)45 mm (1.8 inches)82%high
October Weather12°C (53°F)86 mm (3.4 inches)90%moderate
November Weather8°C (47°F)53 mm (2.1 inches)92%low
December Weather6°C (44°F)82 mm (3.2 inches)92%low

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