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
Weather in December
Temperature
In December, the average high-temperature registers at a still refreshing 16°C (60.8°F), nearly identical to November's 17.7°C (63.9°F). Vale de Santiago experiences a steady nighttime temperature of 12.5°C (54.5°F) throughout the month of December.Humidity
The average relative humidity in December in Vale de Santiago is 74%.Rainfall
In Vale de Santiago, during December, the rain falls for 9.4 days and regularly aggregates up to 42mm (1.65") of precipitation. Throughout the year, there are 94.7 rainfall days, and 328mm (12.91") of precipitation is accumulated.Daylight
With an average of 9h and 36min of daylight, December has the shortest days of the year in Vale de Santiago.On the first day of December, sunrise is at 07:30 and sunset at 17:15. On the last day of the month, sunrise is at 07:48 and sunset at 17:24 WET.
Sunshine
In December, the average sunshine is 6.2h.UV index
January through April, November and December, with an average maximum UV index of 4, are months with the lowest UV index. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: In December, a daily maximum UV index of 4 leads to the following instructions:
Ensure safety - Sun damage prevention is strongly urged. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Always opt for UVA and UVB-resistant sunglasses on radiant days.
Frequently asked questions
What is the temperature in December in Vale de Santiago?
What is the average humidity in December in Vale de Santiago?
How much does it rain in Vale de Santiago in December?
What is the month with the shortest days in Vale de Santiago?
What is the average length of the day in December in Vale de Santiago?
When is the sunrise / sunset in December in Vale de Santiago?
How long on average sun shines in December in Vale de Santiago?
What is the month with the lowest UV index in Vale de Santiago?
How high is the UV index in December in Vale de Santiago?
Average temperature in December
Vale de Santiago, Portugal
- Average high temperature in December: 16°C
The warmest month (with the highest average high temperature) is August (24.2°C).
The month with the lowest average high temperature is February (14.8°C).
- Average low temperature in December: 12.5°C
The months with the highest average low temperature are August and September (18.8°C).
The coldest month (with the lowest average low temperature) is February (10.8°C).
Average pressure in December
Vale de Santiago, Portugal
- Average pressure in December: 1022.6mbar
The month with the highest atmospheric pressure is December (1022.6mbar).
The month with the lowest atmospheric pressure is April (1015.7mbar).
Average wind speed in December
Vale de Santiago, Portugal
- Average wind speed in December: 18.1km/h
The windiest month (with the highest average wind speed) is February (19.4km/h).
The calmest month (with the lowest average wind speed) is September (15km/h).
Average humidity in December
Vale de Santiago, Portugal
- Average humidity in December: 74%
The month with the highest relative humidity is April (76%).
The month with the lowest relative humidity is October (72%).
Average rainfall in December
Vale de Santiago, Portugal
- Average rainfall in December: 42mm
The wettest month (with the highest rainfall) is November (56mm).
The driest month (with the least rainfall) is July (1mm).
Average rainfall days in December
Vale de Santiago, Portugal
- Average rainfall days in December: 9.4 days
The month with the highest number of rainy days is November (13.4 days).
The month with the least rainy days is August (1.1 days).
Average daylight in December /
Average sunshine in December
Vale de Santiago, Portugal
- Average daylight in December: 9h and 4min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in December: 6h and 1min
The month with the most sunshine is July (Average sunshine: 11h and 30min).
The month with the least sunshine is January (Average sunshine: 5h and 42min).
Average sunshine days in December
Vale de Santiago, Portugal
- Average sunshine days in December: 20.4 days
The month with the most sunshine days is August (29.4 days).
The month with the least sunshine days is April (15.3 days).
Average UV index in December
Vale de Santiago, 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, April, November and December (UV index 4).
Average cloud cover in December
Vale de Santiago, Portugal
- Average cloud cover in December: 31
The month with the most cloud cover is January (Cloud cover 37).
The month with the least cloud cover is August (Cloud cover 10).
Average visibility in December
Vale de Santiago, 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).
Vale de Santiago, Portugal
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