December weather forecastCacilhas, Portugal
December
Weather in December
The first month of the winter, December, is also a moderate month in Cacilhas, Portugal, with an average temperature fluctuating between 15.7°C (60.3°F) and 12°C (53.6°F).Temperature
On the advent of December, Cacilhas's average high-temperature exhibits a minor adjustment to a still refreshing 15.7°C (60.3°F) from November's 17.4°C (63.3°F). During December, nights in Cacilhas, Portugal, cool slightly to an average low of 12°C (53.6°F).Humidity
January, April, July and December, with an average relative humidity of 75%, are the most humid months.Rainfall
In Cacilhas, in December, during 8.3 rainfall days, 29mm (1.14") of precipitation is typically accumulated. Throughout the year, in Cacilhas, there are 85.8 rainfall days, and 215mm (8.46") of precipitation is accumulated.Sea temperature
In December, the average sea temperature in Cacilhas is 16.6°C (61.9°F).Note: Most people find swimming in 16.6°C (61.9°F) to be not enjoyable. The control of one's breathing becomes more challenging as the water temperature drops below 21°C (69.8°F).
Daylight
With an average of 9h and 30min of daylight, December has the shortest days of the year.On the first day of December in Cacilhas, Portugal, sunrise is at 07:36 and sunset at 17:15. On the last day of the month, sunrise is at 07:54 and sunset at 17:25 WET.
Sunshine
In Cacilhas, the average sunshine in December is 6h.UV index
January through March, November and December, with an average maximum UV index of 4, are months with the lowest UV index. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.Note: A typical high UV index of 4 in December suggests the following recommendations:
Heed the precautions - It is counselled to guard against solar damage. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Cacilhas, Portugal
- Average high temperature in December: 15.7°C
The warmest month (with the highest average high temperature) is August (24.5°C).
The month with the lowest average high temperature is January (14.8°C).
- Average low temperature in December: 12°C
The month with the highest average low temperature is August (18.6°C).
The coldest month (with the lowest average low temperature) is February (10.8°C).
Average pressure in December
Cacilhas, Portugal
- Average pressure in December: 1022.5mbar
The months with the highest atmospheric pressure are January and December (1022.5mbar).
The month with the lowest atmospheric pressure is April (1015.7mbar).
Average wind speed in December
Cacilhas, Portugal
- Average wind speed in December: 17.9km/h
The windiest month (with the highest average wind speed) is February (19.5km/h).
The calmest month (with the lowest average wind speed) is October (15.6km/h).
Average humidity in December
Cacilhas, Portugal
- Average humidity in December: 75%
The months with the highest relative humidity are January, April, July and December (75%).
The months with the lowest relative humidity are May and October (72%).
Average rainfall in December
Cacilhas, Portugal
- Average rainfall in December: 29mm
The wettest month (with the highest rainfall) is November (44mm).
The driest month (with the least rainfall) is July (2mm).
Average rainfall days in December
Cacilhas, Portugal
- Average rainfall days in December: 8.3 days
The month with the highest number of rainy days is November (12.4 days).
The month with the least rainy days is August (1.9 days).
Average sea temperature in December
Cacilhas, Portugal
- Average sea temperature in December: 16.6°C
The best month for swimming (with the highest average sea temperature) is September (19.9°C).
The coldest month (with the lowest average sea temperature) is March (15.1°C).
Average daylight in December /
Average sunshine in December
Cacilhas, Portugal
- Average daylight in December: 9h and 30min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in December: 6h and 0min
The month with the most sunshine is July (Average sunshine: 11h and 24min).
The month with the least sunshine is January (Average sunshine: 5h and 30min).
Average sunshine days in December
Cacilhas, Portugal
- Average sunshine days in December: 20.6 days
The month with the most sunshine days is August (28 days).
The month with the least sunshine days is November (15.6 days).
Average UV index in December
Cacilhas, Portugal
- Average UV index in December: 4
The months with the highest UV index are June, July, August and September (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 4).
Average cloud cover in December
Cacilhas, Portugal
- Average cloud cover in December: 34
The month with the most cloud cover is January (Cloud cover 40).
The month with the least cloud cover is August (Cloud cover 13).
Average visibility in December
Cacilhas, Portugal
- Average visibility in December: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
