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 advent denotes a minor fluctuation in the average high-temperature to a mild 14.9°C (58.8°F) from November's 16.7°C (62.1°F). During December, Rio Maior observes a consistent average nighttime temperature of 9.8°C (49.6°F).Humidity
In December, the average relative humidity is 77%.Rainfall
In Rio Maior, in December, during 9.2 rainfall days, 19mm (0.75") of precipitation is typically accumulated. Throughout the year, in Rio Maior, Portugal, there are 101.5 rainfall days, and 168mm (6.61") of precipitation is accumulated.Daylight
With an average of 9h and 30min of daylight, December has the shortest days of the year in Rio Maior, Portugal.On the first day of December in Rio Maior, sunrise is at 07:36 and sunset at 17:12. On the last day of the month, sunrise is at 07:55 and sunset at 17:22 WET.
Sunshine
In Rio Maior, the average sunshine in December is 5.7h.UV index
In December, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: The UV index of 4 in December translates into these instructions:
Act with care - Obligation to protect against skin and eye damage is highlighted. The Sun's radiation is especially intense around midday; try to stay in shade during this period. Always opt for UVA and UVB-resistant sunglasses on radiant days.
Frequently asked questions
What is the temperature in December in Rio Maior?
What is the average humidity in December in Rio Maior?
How much does it rain in Rio Maior in December?
What is the month with the shortest days in Rio Maior?
How many hours of daylight does Rio Maior have in December?
When are sunrise and sunset in December in Rio Maior?
How many hours of sunshine does Rio Maior have in December?
How high is the UV index in December in Rio Maior?
Average temperature in December
Rio Maior, 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
Rio Maior, 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
Rio Maior, 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 (13.5km/h).
Average humidity in December
Rio Maior, 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
Rio Maior, 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
Rio Maior, 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
Rio Maior, Portugal
- Average daylight in December: 9h and 3min
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 30min).
- 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
Rio Maior, 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
Rio Maior, 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
Rio Maior, Portugal
- Average cloud cover in December: 38
The month with the most cloud cover is January (Cloud cover 44).
The month with the least cloud cover is September (Cloud cover 20).
Average visibility in December
Rio Maior, 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).
Rio Maior, Portugal
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