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
December's beginning signals an average high-temperature of a mild 14.9°C (58.8°F), barely different from November's 16.7°C (62.1°F). Alvorninha experiences a steady low-temperature of 9.8°C (49.6°F) throughout December.Humidity
In December, the average relative humidity is 77%.Rainfall
In December, the rain falls for 9.2 days. Throughout December, 19mm (0.75") of precipitation is accumulated. Throughout the year, there are 101.9 rainfall days, and 170mm (6.69") of precipitation is accumulated.Daylight
With an average of 9h and 24min of daylight, December has the shortest days of the year in Alvorninha.On the first day of the month, sunrise is at 07:37 and sunset at 17:13. On the last day of December, sunrise is at 07:55 and sunset at 17:22 WET.
Sunshine
In December, the average sunshine in Alvorninha is 5.7h.UV index
In Alvorninha, the average daily maximum UV index in December is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: The daily high UV index of 4 in December translates into this advice:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are December temperatures in Alvorninha?
What is the average humidity in December in Alvorninha?
How many days does it rain in December in Alvorninha?
What is the month with the shortest days in Alvorninha?
How many hours of daylight does Alvorninha have in December?
When are sunrise and sunset in December in Alvorninha?
How many hours of sunshine does Alvorninha have in December?
What is the UV index intensity in December in Alvorninha?
Average temperature in December
Alvorninha, Portugal
- Average high temperature in December: 14.9°C
The warmest month (with the highest average high temperature) is August (25.6°C).
The month with the lowest average high temperature is January (14°C).
- Average low temperature in December: 9.8°C
The month with the highest average low temperature is August (17°C).
The coldest month (with the lowest average low temperature) is February (8.8°C).
Average pressure in December
Alvorninha, Portugal
- Average pressure in December: 1022.5mbar
The month with the highest atmospheric pressure is December (1022.5mbar).
The month with the lowest atmospheric pressure is April (1015.5mbar).
Average wind speed in December
Alvorninha, Portugal
- Average wind speed in December: 15.9km/h
The windiest month (with the highest average wind speed) is February (17.7km/h).
The calmest month (with the lowest average wind speed) is September (13.6km/h).
Average humidity in December
Alvorninha, Portugal
- Average humidity in December: 77%
The month with the highest relative humidity is January (79%).
The months with the lowest relative humidity are September and October (72%).
Average rainfall in December
Alvorninha, Portugal
- Average rainfall in December: 19mm
The wettest month (with the highest rainfall) is November (34mm).
The driest months (with the least rainfall) are July and August (3mm).
Average rainfall days in December
Alvorninha, Portugal
- Average rainfall days in December: 9.2 days
The month with the highest number of rainy days is November (13.7 days).
The month with the least rainy days is August (3 days).
Average daylight in December /
Average sunshine in December
Alvorninha, Portugal
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 5h and 4min
The months with the most sunshine are July and August (Average sunshine: 10h and 48min).
The month with the least sunshine is January (Average sunshine: 5h and 6min).
Average sunshine days in December
Alvorninha, Portugal
- Average sunshine days in December: 18.6 days
The month with the most sunshine days is August (25 days).
The month with the least sunshine days is November (13.3 days).
Average UV index in December
Alvorninha, Portugal
- Average UV index in December: 4
The months with the highest UV index are June and August (UV index 6).
The month with the lowest UV index is January (UV index 3).
Average cloud cover in December
Alvorninha, Portugal
- Average cloud cover in December: 38
The month with the most cloud cover is January (Cloud cover 44).
The months with the least cloud cover are August and September (Cloud cover 21).
Average visibility in December
Alvorninha, Portugal
- Average visibility in December: 10km
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (10km).
The months with the lowest visibility are July and August (9km).
Alvorninha, Portugal
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