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December Weather in Newmarket, Canada

Last updated: June 18, 2025

In December, the average temperature in Newmarket, Canada hovers around -2°C (28°F). However, temperatures can dip as low as -28°C (-18°F) or rise to a mild 16°C (62°F). Expect an average of 67 mm (2.6 in) of precipitation over 13 days, with a notably high average humidity of 87%.

December Temperature in Newmarket

In December in Newmarket, the average temperature is -2°C (28°F), with maximums reaching up to 16°C (62°F) and minimums dipping as low as -28°C (-18°F). Travelers should be prepared for a wide range of temperatures and dress in layers to stay comfortable while exploring the area.

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

The chart illustrates December temperature patterns in Newmarket, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Newmarket, December typically has an average temperature of -2°C (28°F), with highs reaching up to 16°C (62°F) and lows dropping to around -28°C (-18°F).
JanFebMarAprMayJunJulAugSepOctNovDec222331425666716962503628
Data source: Temperature data for Newmarket 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 Newmarket

In Newmarket in December, the precipitation amount is 67 mm (2.6 in) spread over 13 days.

December Precipitation Trends in Newmarket

The chart displays monthly precipitation patterns in Newmarket, 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 Newmarket, December typically receives around 67 mm (2.6 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec60616010399949897641007467
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Newmarket

In Newmarket in December, humidity is 87%. With an average temperature of -2°C (28°F), this humidity feels like a damp chill that seeps into your bones, making outdoor exploration less enjoyable and requiring extra layers to stay warm and comfortable while traveling.

December Average Humidity in Newmarket

This chart illustrates the average monthly humidity levels in Newmarket, 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 Newmarket is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%91%88%88%82%80%77%72%76%83%88%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Newmarket

In Newmarket 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 Newmarket, you can visit Hourly UV Index in Newmarket.

Maximum UV Index Levels in Newmarket for December

The chart shows the monthly maximum UV Index (UVI) for Newmarket 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 Newmarket typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2458910997532
Data source: Newmarket 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 Newmarket Compares to Other Months

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

This table compares monthly weather conditions in Newmarket, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (22°F)60 mm (2.4 inches)91%low
February Weather-5°C (23°F)61 mm (2.4 inches)91%moderate
March Weather0°C (32°F)60 mm (2.4 inches)88%moderate
April Weather6°C (42°F)103 mm (4.1 inches)88%very high
May Weather13°C (56°F)99 mm (3.9 inches)82%very high
June Weather19°C (66°F)94 mm (3.7 inches)79%very high
July Weather22°C (72°F)98 mm (3.9 inches)77%very high
August Weather21°C (69°F)97 mm (3.8 inches)72%very high
September Weather16°C (62°F)64 mm (2.5 inches)76%high
October Weather10°C (50°F)100 mm (3.9 inches)83%moderate
November Weather2°C (36°F)74 mm (2.9 inches)88%moderate
December Weather-2°C (28°F)67 mm (2.6 inches)87%low

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