December weather forecast and climate
Sarnia, Canada

What is the temperature in December in Sarnia?

In Sarnia, Canada, in December, the average high-temperature is 1.5°C (34.7°F), and the average low-temperature is -5.1°C (22.8°F).

What is the average humidity in December in Sarnia?

In December, the average relative humidity in Sarnia, Canada, is 84.7%.

How much does it rain in Sarnia in December?

In Sarnia, during December, the rain falls for 7.2 days and regularly aggregates up to 39.6mm (1.6") of precipitation.

How many days does it snow in December in Sarnia?

In Sarnia, Canada, in December, during 9 snowfall days, 261mm (10.3") of snow is typically accumulated.

How cold is the water in December in Sarnia?

In December, the average sea temperature is 4.8°C (40.6°F). For swimming, this is considered life-threatening and very dangerous. The water feels painfully cold, and hyperventilation quickly occurs. A specialized swimsuit is mandatory to reduce thermal damage.
Average temperature in December - Sarnia, Canada
  • Average high temperature in December: 1.5°C

The warmest month (with the highest average high temperature) is July (26.4°C).
The month with the lowest average high temperature is January (-1.2°C).

  • Average low temperature in December: -5.1°C

The month with the highest average low temperature is July (15.8°C).
The coldest month (with the lowest average low temperature) is January (-8.3°C).

Average humidity in December - Sarnia, Canada
  • Average humidity in December: 84.7%

The month with the highest relative humidity is August (91.5%).
The month with the lowest relative humidity is February (82.8%).

Average rainfall in December - Sarnia, Canada
  • Average rainfall in December: 39.6mm

The wettest month (with the highest rainfall) is September (104.7mm).
The driest month (with the lowest rainfall) is January (22.9mm).

Average rainfall days in December - Sarnia, Canada
  • Average rainfall days in December: 7.2 days

The month with the highest number of rainy days is May (12.6 days).
The month with the lowest number of rainy days is February (4.9 days).

Average snowfall in December - Sarnia, Canada
  • Average snowfall in December: 261mm

The month with the highest snowfall is January (310mm).
Months with the lowest snowfall are May, June, July, August and September (0mm).

Average snowfall days in December - Sarnia, Canada
  • Average snowfall days in December: 9 days

The month with the highest number of snowfall days is January (11.3 days).
Months with the lowest number of snowfall days are May, June, July, August and September (0 days).

Average sea temperature in December - Sarnia, Canada
  • Average sea temperature in December: 4.8°C

The best month for swimming (with the highest average sea temperature) is August (23.2°C).
Coldest months (with the lowest average sea temperature) are February and March (0.3°C).

Average daylight in December / Average sunshine in December - Sarnia, Canada
  • Average daylight in December: 9.1h

The month with the longest days is June (Average daylight: 15.3h).
The month with shortest days is December (Average daylight: 9.1h).

  • Average sunshine in December: 2.2h

The month with most sunshine is July (Average sunshine: 9.6h).
The month with least sunshine is December (Average sunshine: 2.2h).

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