Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
With the arrival of December, Sion experiences a modest decline in average high-temperatures, transitioning from an icy 2.5°C (36.5°F) in November to a freezing cold -1.2°C (29.8°F). During the nights in December, Sion observes an average low-temperature of -9.5°C (14.9°F).Humidity
The average relative humidity in December is 84%.Rainfall
In December, the rain falls for 13.9 days. Throughout December, 118mm (4.65") of precipitation is accumulated. Throughout the year, in Sion, there are 233.7 rainfall days, and 1378mm (54.25") of precipitation is accumulated.Snowfall
Months with snowfall in Sion are January through May, September through December. In Sion, during December, snow falls for 7.2 days and regularly aggregates up to 156mm (6.14") of snow. In Sion, during the entire year, snow falls for 40.9 days and aggregates up to 716mm (28.19") of snow.Daylight
The month with the shortest days is December, with an average of 8h and 42min of daylight.On the first day of the month, sunrise is at 07:53 and sunset at 16:46. On the last day of December, in Sion, sunrise is at 08:13 and sunset at 16:54 CET.
Sunshine
The average sunshine in December in Sion is 4.9h.UV index
The average daily maximum UV index in December in Sion is 2. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum daily UV index of 2 in December interprets into the following recommendations:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Opt for tightly woven and loose clothing to enhance protection from the Sun. Bear in mind! The Sun's UV radiation can nearly double in intensity due to the reflective quality of snow.
Frequently asked questions
How cold is it in Sion in December?
What is the average humidity in December in Sion?
How much does it rain in Sion in December?
How many days does it snow in December in Sion?
What is the month with the shortest days in Sion?
What is the average length of the day in December in Sion?
When are sunrise and sunset in December in Sion?
How long on average sun shines in December in Sion?
What is the UV index intensity in December in Sion?
Average temperature in December
Sion, Switzerland
- Average high temperature in December: -1.2°C
The warmest month (with the highest average high temperature) is August (16.7°C).
The month with the lowest average high temperature is January (-2.5°C).
- Average low temperature in December: -9.5°C
The month with the highest average low temperature is August (6.4°C).
The coldest months (with the lowest average low temperature) are January and February (-11°C).
Average pressure in December
Sion, 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 (1015.2mbar).
Average wind speed in December
Sion, Switzerland
- Average wind speed in December: 8.3km/h
The windiest month (with the highest average wind speed) is December (8.3km/h).
The calmest month (with the lowest average wind speed) is August (6.2km/h).
Average humidity in December
Sion, Switzerland
- Average humidity in December: 84%
The month with the highest relative humidity is March (90%).
The months with the lowest relative humidity are July and August (79%).
Average rainfall in December
Sion, Switzerland
- Average rainfall in December: 118mm
The wettest month (with the highest rainfall) is May (177mm).
The driest month (with the least rainfall) is September (76mm).
Average rainfall days in December
Sion, Switzerland
- Average rainfall days in December: 13.9 days
The month with the highest number of rainy days is May (25.8 days).
The month with the least rainy days is February (13.8 days).
Average snowfall in December
Sion, Switzerland
- Average snowfall in December: 156mm
The month with the highest snowfall is February (167mm).
The months with the least snowfall are June, July and August (0mm).
Average snowfall days in December
Sion, Switzerland
- Average snowfall days in December: 7.2 days
The month with the highest number of snowfall days is February (10.2 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Sion, Switzerland
- Average daylight in December: 8h and 4min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in December: 4h and 5min
The months with the most sunshine are July and August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).
Average sunshine days in December
Sion, Switzerland
- Average sunshine days in December: 12.6 days
The month with the most sunshine days is October (13.5 days).
The month with the least sunshine days is June (2.8 days).
Average UV index in December
Sion, Switzerland
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 4).
The months with the lowest UV index are January and November (UV index 1).
Average cloud cover in December
Sion, Switzerland
- Average cloud cover in December: 47
The months with the most cloud cover are February and March (Cloud cover 53).
The month with the least cloud cover is October (Cloud cover 37).
Average visibility in December
Sion, Switzerland
- Average visibility in December: 7km
The months with the highest visibility are June, July, August, October and November (8km).
The months with the lowest visibility are January, February and March (6km).
Sion, Switzerland
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