December weather forecast
Aarau, Switzerland

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Weather in December

Finally, December arrives in Aarau marking the zenith of the cold winter season. Featuring the year's heaviest rainfall of 81mm (3.19"), it gears up for the festive spirit. With daylight receding to its shortest duration, afternoons get clouded by early dusk. As snowflakes fall against the backdrop of charming cityscape and isolated landscapes, winter delight finds its peak. December truly lives up to its reputation of a classic Swiss winter month.

Temperature

December brings a minor shift in the average high-temperature, adjusting from a frosty 8.3°C (46.9°F) in November to an icy 4.2°C (39.6°F). Aarau records an average low of -1.7°C (28.9°F) throughout the nights in December.

Humidity

In Aarau, the average relative humidity in December is 86%.

Rainfall

In Aarau, in December, it is raining for 15.2 days, with typically 81mm (3.19") of accumulated precipitation. Throughout the year, there are 190.8 rainfall days, and 880mm (34.65") of precipitation is accumulated.

Snowfall

Months with snowfall in Aarau are January through May, October through December. In Aarau, in December, during 7.9 snowfall days, 143mm (5.63") of snow is typically accumulated. Throughout the year, there are 39.9 snowfall days, and 652mm (25.67") of snow is accumulated.

Daylight

With an average of 8h and 30min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 07:54 and sunset at 16:39. On the last day of the month, sunrise is at 08:15 and sunset at 16:47 CET.

Sunshine

With an average of 5h of sunshine, December has the least sunshine of the year.

UV index

The months with the lowest UV index are January, February, October through December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for the average person.
Note: An average UV index of 2 in December transforms into this advice:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection. Take warning! The intensity of the Sun's UV radiation can be nearly amplified twice due to snow reflection.
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Frequently asked questions

How cold does it get in Aarau in December?

The high-temperature, in December, in Aarau, records 4.2°C (39.6°F), while the low-temperature is -1.7°C (28.9°F).

What is the average humidity in December in Aarau?

The average relative humidity in December is 86%.

How much does it rain in Aarau in December?

In Aarau, during December, the rain falls for 15.2 days and regularly aggregates up to 81mm (3.19") of precipitation.

How many days does it snow in December in Aarau?

In December, in Aarau, it is snowing for 7.9 days. Throughout December, 143mm (5.63") of snow is accumulated.

What is the month with the shortest days in Aarau?

With an average of 8h and 30min of daylight, December has the shortest days of the year.

How many hours of daylight does Aarau have in December?

The average day length in December in Aarau is 8h and 32min.

What time are sunrise and sunset in December in Aarau?

In December, on the first day of the month, sunrise is at 07:54 and sunset at 16:39. On the last day of the month, in Aarau, sunrise is at 08:15 and sunset at 16:47 CET.

What is the month with the least sunshine in Aarau?

With an average of 5h of sunshine, December has the least sunshine of the year in Aarau, Switzerland.

How many hours of sunshine does Aarau have in December?

In December, the average sunshine duration is 5h.

When is the lowest UV index in Aarau?

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

What is the UV index reading in December in Aarau?

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

Average temperature in December - Aarau, Switzerland
  • Average high temperature in December: 4.2°C

The warmest months (with the highest average high temperature) are July and August (23.3°C).
The month with the lowest average high temperature is January (2.9°C).

  • Average low temperature in December: -1.7°C

The months with the highest average low temperature are July and August (11.8°C).
The coldest month (with the lowest average low temperature) is February (-3.4°C).

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Average pressure in December
Aarau, Switzerland

Average pressure in December - Aarau, Switzerland
  • Average pressure in December: 1020.9mbar

The month with the highest atmospheric pressure is December (1020.9mbar).
The month with the lowest atmospheric pressure is April (1015.6mbar).

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Average wind speed in December
Aarau, Switzerland

Average wind speed in December - Aarau, Switzerland
  • Average wind speed in December: 8.5km/h

The windiest month (with the highest average wind speed) is March (8.8km/h).
The calmest month (with the lowest average wind speed) is August (5.9km/h).

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Average humidity in December
Aarau, Switzerland

Average humidity in December - Aarau, Switzerland
  • Average humidity in December: 86%

The month with the highest relative humidity is January (88%).
The months with the lowest relative humidity are April and July (78%).

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Average rainfall in December
Aarau, Switzerland

Average rainfall in December - Aarau, Switzerland
  • Average rainfall in December: 81mm

The wettest month (with the highest rainfall) is May (106mm).
The driest month (with the least rainfall) is September (45mm).

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Average rainfall days in December
Aarau, Switzerland

Average rainfall days in December - Aarau, Switzerland
  • Average rainfall days in December: 15.2 days

The month with the highest number of rainy days is May (22.4 days).
The month with the least rainy days is February (10.6 days).

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Average snowfall in December
Aarau, Switzerland

Average snowfall in December - Aarau, Switzerland
  • Average snowfall in December: 143mm

The month with the highest snowfall is February (153mm).
The months with the least snowfall are June, July, August and September (0mm).

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Average snowfall days in December
Aarau, Switzerland

Average snowfall days in December - Aarau, Switzerland
  • Average snowfall days in December: 7.9 days

The month with the highest number of snowfall days is February (9.7 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
Aarau, Switzerland

Average daylight in December / Average sunshine in December - Aarau, Switzerland
  • Average daylight in December: 8h and 3min

The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).

  • Average sunshine in December: 5h and 0min

The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is December (Average sunshine: 5h and 0min).

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Average sunshine days in December
Aarau, Switzerland

Average sunshine days in December - Aarau, Switzerland
  • Average sunshine days in December: 12.4 days

The month with the most sunshine days is October (15 days).
The month with the least sunshine days is May (6.6 days).

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Average UV index in December
Aarau, Switzerland

Average UV index in December - Aarau, Switzerland
  • Average UV index in December: 2

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

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Average cloud cover in December
Aarau, Switzerland

Average cloud cover in December - Aarau, Switzerland
  • Average cloud cover in December: 48

The month with the most cloud cover is January (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 32).

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Average visibility in December
Aarau, Switzerland

Average visibility in December - Aarau, Switzerland
  • Average visibility in December: 8km

The months with the highest visibility are March, April, July and August (9km).
The months with the lowest visibility are January, February, May, June, September, October, November and December (8km).

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Aarau, Switzerland

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