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 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
As December unfolds, the average high-temperature reaches a moderate 15.5°C (59.9°F), hinting at a slight fluctuation from the previous month. During the month of December, São João do Estoril's average nighttime temperature closely mirrors its daytime counterpart, at a cool 12.5°C (54.5°F).Humidity
The average relative humidity in December is 75%.Rainfall
In São João do Estoril, during December, the rain falls for 11 days and regularly aggregates up to 52mm (2.05") of precipitation. In São João do Estoril, during the entire year, the rain falls for 106.9 days and collects up to 365mm (14.37") of precipitation.Daylight
With an average of 9h and 30min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 07:37 and sunset at 17:16. On the last day of the month, sunrise is at 07:55 and sunset at 17:26 WET.
Sunshine
In São João do Estoril, 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 in São João do Estoril. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.Note: In December, the UV index of 4 transforms into the following advice:
Prioritize safety - Suggestions to prevent sun damage are offered. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in December?
What is the average humidity in December?
How much does it rain in December?
What is the month with the shortest days?
How many hours of daylight does São João do Estoril have in December?
When is the sunrise / sunset in December?
How long on average sun shines in December?
What are the months with the lowest UV index?
How high is the UV index in December?
Average temperature in December
São João do Estoril, Portugal
- Average high temperature in December: 15.5°C
The warmest month (with the highest average high temperature) is August (23.1°C).
The month with the lowest average high temperature is January (14.5°C).
- Average low temperature in December: 12.5°C
The month with the highest average low temperature is August (18.8°C).
The coldest month (with the lowest average low temperature) is February (11.7°C).
Average pressure in December
São João do Estoril, 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
São João do Estoril, Portugal
- Average wind speed in December: 19.4km/h
The windiest month (with the highest average wind speed) is February (21.1km/h).
The calmest month (with the lowest average wind speed) is October (16.9km/h).
Average humidity in December
São João do Estoril, Portugal
- Average humidity in December: 75%
The month with the highest relative humidity is July (77%).
The months with the lowest relative humidity are February, May, October and November (74%).
Average rainfall in December
São João do Estoril, Portugal
- Average rainfall in December: 52mm
The wettest month (with the highest rainfall) is November (68mm).
The driest month (with the least rainfall) is July (2mm).
Average rainfall days in December
São João do Estoril, Portugal
- Average rainfall days in December: 11 days
The month with the highest number of rainy days is November (14.5 days).
The month with the least rainy days is August (1.7 days).
Average daylight in December /
Average sunshine in December
São João do Estoril, Portugal
- Average daylight in December: 9h and 3min
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 18min).
The month with the least sunshine is January (Average sunshine: 5h and 24min).
Average sunshine days in December
São João do Estoril, Portugal
- Average sunshine days in December: 17.9 days
The month with the most sunshine days is August (27.3 days).
The month with the least sunshine days is November (13.4 days).
Average UV index in December
São João do Estoril, Portugal
- Average UV index in December: 4
The month with the highest UV index is August (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
São João do Estoril, Portugal
- Average cloud cover in December: 35
The month with the most cloud cover is January (Cloud cover 40).
The month with the least cloud cover is August (Cloud cover 14).
Average visibility in December
São João do Estoril, 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).
