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December Weather in Farnham, Canada

Last updated: June 18, 2025

In Farnham, Canada, the average temperature in December hovers around -4°C (25°F), but it can swing dramatically, with minimums plunging to -27°C (-15°F) and maximums reaching a mild 15°C (60°F). Expect 85 mm (3.3 in) of precipitation spread across 13 days, making it a rather wet month. To top it off, the average humidity sits at a high 89%, adding to the chilly atmosphere.

December Temperature in Farnham

In December in Farnham, the average temperature is -4°C (25°F). Maximum temperatures can reach 15°C (60°F), while the minimum can drop to as low as -27°C (-15°F). It's essential to prepare for a wide range of temperatures when traveling during this month.

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

The chart illustrates December temperature patterns in Farnham, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Farnham, December typically has an average temperature of -4°C (25°F), with highs reaching up to 15°C (60°F) and lows dropping to around -27°C (-15°F).
JanFebMarAprMayJunJulAugSepOctNovDec182129435766716961503525
Data source: Temperature data for Farnham 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 Farnham

In Farnham in December, the precipitation amount is 85 mm (3.3 in) spread over 13 days.

December Precipitation Trends in Farnham

The chart displays monthly precipitation patterns in Farnham, 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 Farnham, December typically receives around 85 mm (3.3 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec8984871171001111111167414812185
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Farnham

In Farnham in December humidity is 89%. With an average temperature of -4°C (25°F), this humidity feels like an intense chill that seeps into your bones, making traveling uncomfortable as you navigate through the damp, cold air.

December Average Humidity in Farnham

This chart illustrates the average monthly humidity levels in Farnham, 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 Farnham is approximately 89%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%92%86%85%80%74%76%75%78%86%89%89%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Farnham

In Farnham in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Farnham, you can visit Hourly UV Index in Farnham.

Maximum UV Index Levels in Farnham for December

The chart shows the monthly maximum UV Index (UVI) for Farnham 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 Farnham typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec245799887532
Data source: Farnham 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 Farnham Compares to Other Months

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

This table compares monthly weather conditions in Farnham, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-8°C (18°F)89 mm (3.5 inches)93%low
February Weather-6°C (21°F)84 mm (3.3 inches)92%moderate
March Weather-2°C (29°F)86 mm (3.4 inches)86%moderate
April Weather6°C (43°F)117 mm (4.6 inches)85%high
May Weather14°C (57°F)100 mm (3.9 inches)80%very high
June Weather19°C (66°F)111 mm (4.4 inches)74%very high
July Weather22°C (71°F)111 mm (4.4 inches)76%very high
August Weather21°C (69°F)116 mm (4.6 inches)75%very high
September Weather16°C (61°F)74 mm (2.9 inches)78%high
October Weather10°C (50°F)148 mm (5.8 inches)86%moderate
November Weather1°C (35°F)121 mm (4.8 inches)88%moderate
December Weather-4°C (25°F)85 mm (3.3 inches)89%low

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