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December Weather in Summerside, Canada

Last updated: June 18, 2025

In December, the average temperature in Summerside, Canada hovers around -2°C (28°F). While the mercury can drop to a chilly -19°C (-2°F), it can also rise to a pleasant 15°C (60°F). Expect about 93 mm (3.7 in) of precipitation spread over 12 days, with an average humidity of 84%, making for a truly crisp and refreshing ambience.

December Temperature in Summerside

In December in Summerside, the average temperature is -2°C (28°F). The maximum can reach 15°C (60°F) while the minimum can be as low as -19°C (-2°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for both chilly and mild weather.

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

The chart illustrates December temperature patterns in Summerside, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Summerside, December typically has an average temperature of -2°C (28°F), with highs reaching up to 15°C (60°F) and lows dropping to around -19°C (-2°F).
JanFebMarAprMayJunJulAugSepOctNovDec222127384860676860503828
Data source: Temperature data for Summerside 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 Summerside

In Summerside in December, the precipitation amount is 93 mm (3.7 in) over the course of 12 days.

December Precipitation Trends in Summerside

The chart displays monthly precipitation patterns in Summerside, 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 Summerside, December typically receives around 93 mm (3.7 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec86927384939663691017813293
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Summerside

In Summerside in December humidity is 84%. With an average temperature of -2°C (28°F), this humidity feels like a biting chill that cuts through layers of clothing, making outdoor activities uncomfortable and travel challenging.

December Average Humidity in Summerside

This chart illustrates the average monthly humidity levels in Summerside, 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 Summerside is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%84%86%86%85%82%86%87%85%85%85%84%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Summerside

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

Maximum UV Index Levels in Summerside for December

The chart shows the monthly maximum UV Index (UVI) for Summerside 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 Summerside typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2357810887532
Data source: Summerside 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 Summerside Compares to Other Months

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

This table compares monthly weather conditions in Summerside, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (22°F)86 mm (3.4 inches)84%low
February Weather-6°C (22°F)92 mm (3.6 inches)84%moderate
March Weather-3°C (28°F)73 mm (2.9 inches)86%moderate
April Weather4°C (39°F)84 mm (3.3 inches)86%high
May Weather9°C (48°F)93 mm (3.6 inches)85%very high
June Weather16°C (60°F)96 mm (3.8 inches)82%very high
July Weather20°C (68°F)63 mm (2.5 inches)86%very high
August Weather20°C (69°F)69 mm (2.7 inches)87%very high
September Weather16°C (60°F)101 mm (4.0 inches)85%high
October Weather10°C (50°F)78 mm (3.1 inches)85%moderate
November Weather3°C (38°F)132 mm (5.2 inches)85%moderate
December Weather-2°C (28°F)93 mm (3.7 inches)84%low

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