December weather forecast and climate
Rio de Onor, Portugal

Weather in December

December, the first month of the winter, in Rio de Onor, is still a chilly month, with average temperature varying between 2°C (35.6°F) and 8.9°C (48°F).

Temperature

In December, the average high-temperature is relatively the same as in November - a frosty 8.9°C (48°F). In December, the average low-temperature is 2°C (35.6°F).

Humidity

The average relative humidity in Rio de Onor is 84%.

Rainfall

In Rio de Onor, in December, during 12.7 rainfall days, 70mm (2.76") of precipitation is typically accumulated. Throughout the year, in Rio de Onor, there are 141.7 rainfall days, and 532mm (20.94") of precipitation is accumulated.

Snowfall

Months with snowfall in Rio de Onor, Portugal, are January through March, November and December. In December, in Rio de Onor, it is snowing for 1 days. Throughout December, 13mm (0.51") of snow is accumulated. In Rio de Onor, during the entire year, snow falls for 6.4 days, and aggregates up to 51mm (2.01") of snow.

Daylight

December has the shortest days of the year in Rio de Onor, with an average of 9.2h of daylight.

Sunshine

The average sunshine in Rio de Onor is 5.1h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Rio de Onor, Portugal. A UV Index estimate of 2, and below, represents a low health risk from the exposure to the Sun's UV rays for the average person.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in December in Rio de Onor?

In Rio de Onor, Portugal, in December, the average high-temperature is 8.9°C (48°F), and the average low-temperature is 2°C (35.6°F).

What is the average humidity in December in Rio de Onor?

In Rio de Onor, Portugal, the average relative humidity in December is 84%.

How many days does it rain in December in Rio de Onor?

In Rio de Onor, in December, it is raining for 12.7 days, with typically 70mm (2.76") of accumulated precipitation.

How many days does it snow in December in Rio de Onor?

In Rio de Onor, Portugal, in December, during 1 snowfall days, 13mm (0.51") of snow is typically accumulated.

What is the month with the shortest days in Rio de Onor?

The month with the shortest days in Rio de Onor is December, with an average of 9.2h of daylight.

How many hours of daylight does Rio de Onor have in December?

The average length of the day in December in Rio de Onor, Portugal, is 9.2h.

How long on average sun shines in December in Rio de Onor?

The average sunshine in December in Rio de Onor is 5.1h.

What is the month with the lowest UV index in Rio de Onor?

Months with the lowest UV index in Rio de Onor, Portugal, are January, February, November and December, with an average maximum UV index of 2.

How high is the UV index in December in Rio de Onor?

The average daily maximum UV index in December in Rio de Onor, Portugal, is 2. A UV Index reading of 2, and below, represents a minimal hazard to health from unprotected exposure to the UV radiation.

Average temperature in December
Rio de Onor, Portugal

Average temperature in December - Rio de Onor, Portugal
  • Average high temperature in December: 8.9°C

The warmest month (with the highest average high temperature) is August (28.3°C).
The month with the lowest average high temperature is January (8.3°C).

  • Average low temperature in December: 2°C

The month with the highest average low temperature is July (13.8°C).
The coldest month (with the lowest average low temperature) is February (1.2°C).

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Average pressure in December
Rio de Onor, Portugal

Average pressure in December - Rio de Onor, Portugal
  • Average pressure in December: 1022.9mbar

The month with the highest atmospheric pressure is December (1022.9mbar).
The month with the lowest atmospheric pressure is April (1015.4mbar).

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Average wind speed in December
Rio de Onor, Portugal

Average wind speed in December - Rio de Onor, Portugal
  • Average wind speed in December: 8.8km/h

The windiest month (with the highest average wind speed) is March (11.2km/h).
The calmest month (with the lowest average wind speed) is September (8.4km/h).

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Average humidity in December
Rio de Onor, Portugal

Average humidity in December - Rio de Onor, Portugal
  • Average humidity in December: 84%

The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is August (52%).

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Average rainfall in December
Rio de Onor, Portugal

Average rainfall in December - Rio de Onor, Portugal
  • Average rainfall in December: 70mm

The wettest month (with the highest rainfall) is November (73mm).
The driest month (with the least rainfall) is August (11mm).

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Average rainfall days in December
Rio de Onor, Portugal

Average rainfall days in December - Rio de Onor, Portugal
  • Average rainfall days in December: 12.7 days

The month with the highest number of rainy days is April (17.6 days).
The month with the least rainy days is August (4.2 days).

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Average snowfall in December
Rio de Onor, Portugal

Average snowfall in December - Rio de Onor, Portugal
  • Average snowfall in December: 13mm

The month with the highest snowfall is February (19mm).
Months with the least snowfall are April, May, June, July, August, September and October (0mm).

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Average snowfall days in December
Rio de Onor, Portugal

Average snowfall days in December - Rio de Onor, Portugal
  • Average snowfall days in December: 1 days

The month with the highest number of snowfall days is January (2.1 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in December /
Average sunshine in December
Rio de Onor, Portugal

Average daylight in December / Average sunshine in December - Rio de Onor, Portugal
  • Average daylight in December: 9.2h

The month with the longest days is June (Average daylight: 15.2h).
The month with the shortest days is December (Average daylight: 9.2h).

  • Average sunshine in December: 5.1h

The month with the most sunshine is July (Average sunshine: 11.8h).
The month with the least sunshine is January (Average sunshine: 4.8h).

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Average sunshine days in December
Rio de Onor, Portugal

Average sunshine days in December - Rio de Onor, Portugal
  • Average sunshine days in December: 16.3 days

The month with the most sunshine days is August (24.5 days).
The month with the least sunshine days is April (10.8 days).

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Average UV index in December
Rio de Onor, Portugal

Average UV index in December - Rio de Onor, Portugal
  • Average UV index in December: 2

The month with the highest UV index is July (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in December
Rio de Onor, Portugal

Average cloud cover in December - Rio de Onor, Portugal
  • Average cloud cover in December: 46

The month with the most cloud cover is January (Cloud cover 50).
Months with the least cloud cover are July and August (Cloud cover 13).

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Average visibility in December
Rio de Onor, Portugal

Average visibility in December - Rio de Onor, Portugal
  • Average visibility in December: 8km

Months with the highest visibility are June, July, August and September (10km).
Months with the lowest visibility are January, November and December (8km).

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