December weather forecast and climate
São João da Ribeira, Portugal

Weather in December

December, the first month of the winter, in São João da Ribeira, is still a mild month, with temperature in the range of an average low of 7.5°C (45.5°F) and an average high of 15.1°C (59.2°F).

Temperature

In December, the average high-temperature is almost the same as in November - a moderate 15.1°C (59.2°F). In São João da Ribeira, Portugal, the average low-temperature is 7.5°C (45.5°F).

Humidity

In December, the average relative humidity is 78%.

Rainfall

In São João da Ribeira, Portugal, in December, during 10.1 rainfall days, 42mm (1.65") of precipitation is typically accumulated. In São João da Ribeira, during the entire year, the rain falls for 108.1 days and collects up to 337mm (13.27") of precipitation.

Daylight

With an average of 9.5h of daylight, December has the shortest days of the year in São João da Ribeira.

Sunshine

The average sunshine in December is 5.6h.

UV index

January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index of 3 to 5 symbolizes a medium health hazard from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 3 interpret into the following advice:
Take precautions - Protection against the skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in December in São João da Ribeira?

In December, in São João da Ribeira, the average high-temperature is 15.1°C (59.2°F), and the average low-temperature is 7.5°C (45.5°F).

What is the average humidity in December in São João da Ribeira?

In December, the average relative humidity is 78%.

How much does it rain in São João da Ribeira in December?

In São João da Ribeira, in December, it is raining for 10.1 days, with typically 42mm (1.65") of accumulated precipitation.

What is the month with the shortest days in São João da Ribeira?

With an average of 9.5h of daylight, December has the shortest days of the year.

What is the average length of the day in December in São João da Ribeira?

In December, the average length of the day is 9.5h.

How many hours of sunshine does São João da Ribeira have in December?

In December, the average sunshine is 5.6h.

What are the months with the lowest UV index in São João da Ribeira?

January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index in São João da Ribeira, Portugal.

What is the UV index intensity in December in São João da Ribeira?

In São João da Ribeira, Portugal, the average daily maximum UV index in December is 3. A UV Index estimate of 3 to 5 represents a moderate vulnerability from the exposure to the Sun's UV radiation.

Average temperature in December
São João da Ribeira, Portugal

Average temperature in December - São João da Ribeira, Portugal
  • Average high temperature in December: 15.1°C

The warmest month (with the highest average high temperature) is August (31°C).
The month with the lowest average high temperature is January (14°C).

  • Average low temperature in December: 7.5°C

The month with the highest average low temperature is July (15.8°C).
The coldest months (with the lowest average low temperature) are January and February (6.8°C).

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Average pressure in December
São João da Ribeira, Portugal

Average pressure in December - São João da Ribeira, 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 (1015.5mbar).

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Average wind speed in December
São João da Ribeira, Portugal

Average wind speed in December - São João da Ribeira, Portugal
  • Average wind speed in December: 11.2km/h

The windiest month (with the highest average wind speed) is July (13.2km/h).
The calmest months (with the lowest average wind speed) are September and October (10.6km/h).

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Average humidity in December
São João da Ribeira, Portugal

Average humidity in December - São João da Ribeira, Portugal
  • Average humidity in December: 78%

The month with the highest relative humidity is January (81%).
The month with the lowest relative humidity is August (62%).

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Average rainfall in December
São João da Ribeira, Portugal

Average rainfall in December - São João da Ribeira, Portugal
  • Average rainfall in December: 42mm

The wettest month (with the highest rainfall) is November (53mm).
The driest months (with the least rainfall) are July and August (3mm).

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Average rainfall days in December
São João da Ribeira, Portugal

Average rainfall days in December - São João da Ribeira, Portugal
  • Average rainfall days in December: 10.1 days

The month with the highest number of rainy days is November (13.9 days).
The month with the least rainy days is August (2.4 days).

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Average daylight in December /
Average sunshine in December
São João da Ribeira, Portugal

Average daylight in December / Average sunshine in December - São João da Ribeira, Portugal
  • Average daylight in December: 9.5h

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in December: 5.6h

The month with the most sunshine is July (Average sunshine: 11.2h).
The month with the least sunshine is January (Average sunshine: 5.2h).

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Average sunshine days in December
São João da Ribeira, Portugal

Average sunshine days in December - São João da Ribeira, Portugal
  • Average sunshine days in December: 19.3 days

The month with the most sunshine days is July (27.3 days).
Months with the least sunshine days are April and November (14.6 days).

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Average UV index in December
São João da Ribeira, Portugal

Average UV index in December - São João da Ribeira, Portugal
  • Average UV index in December: 3

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in December
São João da Ribeira, Portugal

Average cloud cover in December - São João da Ribeira, Portugal
  • Average cloud cover in December: 37

The month with the most cloud cover is January (Cloud cover 42).
The month with the least cloud cover is August (Cloud cover 17).

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Average visibility in December
São João da Ribeira, Portugal

Average visibility in December - São João da Ribeira, Portugal
  • Average visibility in December: 9km

The month with the highest visibility is June (10km).
Months with the lowest visibility are January, February, March, April, May, July, August, September, October, November and December (9km).

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