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
December
Weather in December
Temperature
Arcas notes an average high-temperature of a frosty 8.9°C (48°F) in December, hardly diverging from November. During December, Arcas experiences a consistent low-temperature average of 2°C (35.6°F).Humidity
In December, the average relative humidity is 84%.Rainfall
In Arcas, Portugal, in December, during 12.7 rainfall days, 70mm (2.76") of precipitation is typically accumulated. In Arcas, during the entire year, the rain falls for 141.7 days and collects up to 532mm (20.94") of precipitation.Snowfall
January through March, November and December are months with snowfall in Arcas, Portugal. In Arcas, in December, during 1 snowfall days, 13mm (0.51") of snow is typically accumulated. In Arcas, during the entire year, snow falls for 6.4 days and aggregates up to 51mm (2.01") of snow.Daylight
With an average of 9h and 12min of daylight, December has the shortest days of the year in Arcas, Portugal.On the first day of December in Arcas, sunrise is at 07:35 and sunset at 16:58. On the last day of the month, sunrise is at 07:54 and sunset at 17:07 WET.
Sunshine
In Arcas, the average sunshine in December is 5.1h.UV index
The months with the lowest UV index in Arcas are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: The maximum UV index, 2 during December, leads to the following recommendations:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Experience reduced UV exposure by about half when donning a wide-brim hat. Remember this! The UV radiation of the Sun can be nearly doubled by the reflective properties of snow.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Arcas in December?
What is the average humidity in December in Arcas?
How much does it rain in Arcas in December?
How many days does it snow in December in Arcas?
What is the month with the shortest days in Arcas?
What is the average length of the day in December in Arcas?
What time are sunrise and sunset in December in Arcas?
How long on average sun shines in December in Arcas?
What is the month with the lowest UV index in Arcas?
What is the UV index intensity in December in Arcas?
Average temperature in December
Arcas, Portugal
- Average high temperature in December: 8.9°C
The warmest month (with the highest average high temperature) is August (28.3°C).
The month with the lowest average high temperature is January (8.3°C).
- Average low temperature in December: 2°C
The month with the highest average low temperature is July (13.8°C).
The coldest month (with the lowest average low temperature) is February (1.2°C).
Average pressure in December
Arcas, Portugal
- Average pressure in December: 1022.9mbar
The month with the highest atmospheric pressure is December (1022.9mbar).
The month with the lowest atmospheric pressure is April (1015.4mbar).
Average wind speed in December
Arcas, Portugal
- Average wind speed in December: 8.8km/h
The windiest month (with the highest average wind speed) is March (11.2km/h).
The calmest month (with the lowest average wind speed) is September (8.4km/h).
Average humidity in December
Arcas, Portugal
- Average humidity in December: 84%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is August (52%).
Average rainfall in December
Arcas, Portugal
- Average rainfall in December: 70mm
The wettest month (with the highest rainfall) is November (73mm).
The driest month (with the least rainfall) is August (11mm).
Average rainfall days in December
Arcas, Portugal
- Average rainfall days in December: 12.7 days
The month with the highest number of rainy days is April (17.6 days).
The month with the least rainy days is August (4.2 days).
Average snowfall in December
Arcas, Portugal
- Average snowfall in December: 13mm
The month with the highest snowfall is February (19mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in December
Arcas, Portugal
- Average snowfall days in December: 1 days
The month with the highest number of snowfall days is January (2.1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Arcas, Portugal
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in December: 5h and 1min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 4h and 48min).
Average sunshine days in December
Arcas, Portugal
- Average sunshine days in December: 16.3 days
The month with the most sunshine days is August (24.5 days).
The month with the least sunshine days is April (10.8 days).
Average UV index in December
Arcas, Portugal
- Average UV index in December: 2
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Arcas, Portugal
- Average cloud cover in December: 46
The month with the most cloud cover is January (Cloud cover 50).
The months with the least cloud cover are July and August (Cloud cover 13).
Average visibility in December
Arcas, Portugal
- Average visibility in December: 8km
The months with the highest visibility are June, July, August and September (10km).
The months with the lowest visibility are January, November and December (8km).
