December weather forecast and climate
Rotterdam, Netherlands

An old ship dock in Rotterdam, Netherlands, overlooking the Williamsburg Bridge and the famous Openlucht Binnenvaart museum
An old ship dock in Rotterdam, Netherlands, overlooking the Williamsburg Bridge and the famous Openlucht Binnenvaart museum

Weather in December

The first month of the winter, December, is also a frosty month in Rotterdam, Netherlands, with average temperature fluctuating between 7.2°C (45°F) and 4.2°C (39.6°F).

Temperature

In Rotterdam, the average high-temperature in December is almost the same as in November - a frosty 7.2°C (45°F). In December, in Rotterdam, the average low-temperature is 4.2°C (39.6°F).

Humidity

The most humid month in Rotterdam is December, with an average relative humidity of 85%.

Rainfall

In Rotterdam, it is raining for 11 days, with typically 20mm (0.79") of accumulated precipitation. Throughout the year, there are 130.3 rainfall days, and 205mm (8.07") of precipitation is accumulated.

Snowfall

January through March, November and December are months with snowfall in Rotterdam, Netherlands. In Rotterdam, Netherlands, in December, during 1.9 snowfall days, 7mm (0.28") of snow is typically accumulated. Throughout the year, there are 7.4 snowfall days, and 36mm (1.42") of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 7.9h of daylight.

Sunshine

The month with the least sunshine in Rotterdam, Netherlands, is December, with an average of 3.5h of sunshine.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health hazard from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 2 interpret into the following advice:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the most humid month in Rotterdam?

With an average relative humidity of 85%, December is the most humid month.

What is the average humidity in December in Rotterdam?

The average relative humidity in December is 85%.

How much does it rain in Rotterdam in December?

In Rotterdam, Netherlands, in December, it is raining for 11 days, with typically 20mm (0.79") of accumulated precipitation.

How many days does it snow in December in Rotterdam?

In Rotterdam, in December, during 1.9 snowfall days, 7mm (0.28") of snow is typically accumulated.

What is the month with the shortest days in Rotterdam?

December has the shortest days of the year in Rotterdam, Netherlands, with an average of 7.9h of daylight.

How many hours of daylight does Rotterdam have in December?

In Rotterdam, Netherlands, the average length of the day in December is 7.9h.

What is the month with the least sunshine in Rotterdam?

With an average of 3.5h of sunshine, December has the least sunshine of the year in Rotterdam.

How many hours of sunshine does Rotterdam have in December?

In Rotterdam, Netherlands, the average sunshine in December is 3.5h.

What are the months with the lowest UV index in Rotterdam?

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.

How high is the UV index in December in Rotterdam?

In Rotterdam, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a low health threat from unprotected exposure to the UV radiation.

Average temperature in December
Rotterdam, Netherlands

Average temperature in December - Rotterdam, Netherlands
  • Average high temperature in December: 7.2°C

The warmest months (with the highest average high temperature) are July and August (22°C).
The month with the lowest average high temperature is January (5.6°C).

  • Average low temperature in December: 4.2°C

The month with the highest average low temperature is August (15.3°C).
The coldest month (with the lowest average low temperature) is February (2.3°C).

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Average pressure in December
Rotterdam, Netherlands

Average pressure in December - Rotterdam, Netherlands
  • Average pressure in December: 1014.7mbar

The month with the highest atmospheric pressure is September (1017mbar).
The month with the lowest atmospheric pressure is November (1011.4mbar).

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Average wind speed in December
Rotterdam, Netherlands

Average wind speed in December - Rotterdam, Netherlands
  • Average wind speed in December: 20.2km/h

The windiest month (with the highest average wind speed) is December (20.2km/h).
The calmest months (with the lowest average wind speed) are July and August (13.6km/h).

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Average humidity in December
Rotterdam, Netherlands

Average humidity in December - Rotterdam, Netherlands
  • Average humidity in December: 85%

The month with the highest relative humidity is December (85%).
The month with the lowest relative humidity is April (73%).

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Average rainfall in December
Rotterdam, Netherlands

Average rainfall in December - Rotterdam, Netherlands
  • Average rainfall in December: 20mm

The wettest month (with the highest rainfall) is June (24mm).
The driest month (with the least rainfall) is April (9mm).

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Average rainfall days in December
Rotterdam, Netherlands

Average rainfall days in December - Rotterdam, Netherlands
  • Average rainfall days in December: 11 days

The month with the highest number of rainy days is July (13.8 days).
The month with the least rainy days is February (8.5 days).

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Average snowfall in December
Rotterdam, Netherlands

Average snowfall in December - Rotterdam, Netherlands
  • Average snowfall in December: 7mm

The month with the highest snowfall is February (19mm).
Months with the least snowfall are April, May, June, July, August, September and October (0mm).

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Average snowfall days in December
Rotterdam, Netherlands

Average snowfall days in December - Rotterdam, Netherlands
  • Average snowfall days in December: 1.9 days

The month with the highest number of snowfall days is February (2.2 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in December /
Average sunshine in December
Rotterdam, Netherlands

Average daylight in December / Average sunshine in December - Rotterdam, Netherlands
  • Average daylight in December: 7.9h

The month with the longest days is June (Average daylight: 16.6h).
The month with the shortest days is December (Average daylight: 7.9h).

  • Average sunshine in December: 3.5h

The month with the most sunshine is June (Average sunshine: 9.8h).
The month with the least sunshine is December (Average sunshine: 3.5h).

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Average sunshine days in December
Rotterdam, Netherlands

Average sunshine days in December - Rotterdam, Netherlands
  • Average sunshine days in December: 15 days

The month with the most sunshine days is April (17.5 days).
The month with the least sunshine days is July (13 days).

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Average UV index in December
Rotterdam, Netherlands

Average UV index in December - Rotterdam, Netherlands
  • Average UV index in December: 2

Months with the highest UV index are June, July and August (UV index 5).
Months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in December
Rotterdam, Netherlands

Average cloud cover in December - Rotterdam, Netherlands
  • Average cloud cover in December: 66

The month with the most cloud cover is December (Cloud cover 66).
The month with the least cloud cover is August (Cloud cover 40).

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Average visibility in December
Rotterdam, Netherlands

Average visibility in December - Rotterdam, Netherlands
  • Average visibility in December: 9km

Months with the highest visibility are April, May, June and August (10km).
Months with the lowest visibility are January, February, March, July, September, October, November and December (9km).

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