December weather forecast
Grimsby, Canada

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Weather in December

The first month of the winter, December, is also a wintry month in Grimsby, Canada, with an average temperature fluctuating between -2.8°C (27°F) and 1.4°C (34.5°F).

Temperature

In December, the average high-temperature goes from a chilly 7.1°C (44.8°F) in November to an icy 1.4°C (34.5°F). Grimsby's nighttime temperatures in December see a subtle dip to an average of -2.8°C (27°F).

Humidity

In December, the average relative humidity in Grimsby, Canada, is 82%.

Rainfall

In Grimsby, during December, the rain falls for 11.4 days and regularly aggregates up to 49mm (1.93") of precipitation. Throughout the year, there are 175.2 rainfall days, and 711mm (27.99") of precipitation is accumulated.

Snowfall

January through May, November and December are months with snowfall in Grimsby. In Grimsby, Canada, in December, during 12.4 snowfall days, 74mm (2.91") of snow is typically accumulated. In Grimsby, during the entire year, snow falls for 58.6 days and aggregates up to 463mm (18.23") of snow.

Daylight

December has the shortest days of the year in Grimsby, with an average of 9h and 0min of daylight.
On the first day of December in Grimsby, sunrise is at 7:31 am and sunset at 4:44 pm. On the last day of the month, sunrise is at 7:50 am and sunset at 4:53 pm EST.

Sunshine

In Grimsby, the average sunshine in December is 3.5h.

UV index

With an average maximum UV index of 1, December is the month with the lowest UV index in Grimsby. A UV Index reading of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: A maximum daily UV index of 1 during December morphs into the following directions:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.
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Frequently asked questions

How cold is it in Grimsby in December?

Grimsby in December has an average high-temperature of 1.4°C (34.5°F) and an average low-temperature of -2.8°C (27°F).

What is the average humidity in December in Grimsby?

In December, the average relative humidity in Grimsby, Canada, is 82%.

How many days does it rain in December in Grimsby?

In Grimsby, Canada, during December, the rain falls for 11.4 days and regularly aggregates up to 49mm (1.93") of precipitation.

How much does it snow in Grimsby in December?

In Grimsby, in December, snow falls for 12.4 days, with typically accumulated 74mm (2.91") of snow.

What is the month with the shortest days in Grimsby?

The month with the shortest days in Grimsby is December, with an average of 9h and 0min of daylight.

What is the average length of the day in December in Grimsby?

In December, the average day length is 9h and 3min.

When is the sunrise / sunset in December in Grimsby?

On the first day of December, sunrise is at 7:31 am and sunset at 4:44 pm. On the last day of the month, sunrise is at 7:50 am and sunset at 4:53 pm EST.

How many hours of sunshine does Grimsby have in December?

In Grimsby, the average sunshine duration in December is 3.5h.

What is the month with the lowest UV index in Grimsby?

With an average maximum UV index of 1, December is the month with the lowest UV index in Grimsby, Canada.

What is the UV index intensity in December in Grimsby?

The average daily maximum UV index in December in Grimsby is 1. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Grimsby, Canada

Average temperature in December - Grimsby, Canada
  • Average high temperature in December: 1.4°C

The warmest month (with the highest average high temperature) is July (25.4°C).
The month with the lowest average high temperature is January (-2.3°C).

  • Average low temperature in December: -2.8°C

The month with the highest average low temperature is July (17.3°C).
The coldest month (with the lowest average low temperature) is January (-7.3°C).

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Average pressure in December
Grimsby, Canada

Average pressure in December - Grimsby, Canada
  • Average pressure in December: 1017.6mbar

The months with the highest atmospheric pressure are March and November (1018.5mbar).
The month with the lowest atmospheric pressure is June (1013.3mbar).

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Average wind speed in December
Grimsby, Canada

Average wind speed in December - Grimsby, Canada
  • Average wind speed in December: 17.9km/h

The windiest month (with the highest average wind speed) is January (19km/h).
The calmest month (with the lowest average wind speed) is July (11.3km/h).

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Average humidity in December
Grimsby, Canada

Average humidity in December - Grimsby, Canada
  • Average humidity in December: 82%

The month with the highest relative humidity is February (85%).
The month with the lowest relative humidity is April (75%).

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Average rainfall in December
Grimsby, Canada

Average rainfall in December - Grimsby, Canada
  • Average rainfall in December: 49mm

The wettest month (with the highest rainfall) is July (74mm).
The driest month (with the least rainfall) is September (44mm).

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Average rainfall days in December
Grimsby, Canada

Average rainfall days in December - Grimsby, Canada
  • Average rainfall days in December: 11.4 days

The month with the highest number of rainy days is July (19.2 days).
The month with the least rainy days is February (9.3 days).

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Average snowfall in December
Grimsby, Canada

Average snowfall in December - Grimsby, Canada
  • Average snowfall in December: 74mm

The month with the highest snowfall is February (137mm).
The months with the least snowfall are June, July, August, September and October (0mm).

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Average snowfall days in December
Grimsby, Canada

Average snowfall days in December - Grimsby, Canada
  • Average snowfall days in December: 12.4 days

The month with the highest number of snowfall days is January (14.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in December /
Average sunshine in December
Grimsby, Canada

Average daylight in December / Average sunshine in December - Grimsby, Canada
  • Average daylight in December: 9h and 0min

The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 0min).

  • Average sunshine in December: 3h and 3min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 12min).

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Average sunshine days in December
Grimsby, Canada

Average sunshine days in December - Grimsby, Canada
  • Average sunshine days in December: 9.9 days

The month with the most sunshine days is September (13.8 days).
The month with the least sunshine days is February (9 days).

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Average UV index in December
Grimsby, Canada

Average UV index in December - Grimsby, Canada
  • Average UV index in December: 1

The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is December (UV index 1).

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Average cloud cover in December
Grimsby, Canada

Average cloud cover in December - Grimsby, Canada
  • Average cloud cover in December: 63

The month with the most cloud cover is January (Cloud cover 66).
The month with the least cloud cover is August (Cloud cover 27).

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Average visibility in December
Grimsby, Canada

Average visibility in December - Grimsby, Canada
  • Average visibility in December: 9km

The month with the highest visibility is August (10km).
The month with the lowest visibility is January (8km).

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Grimsby, Canada

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