December weather forecast and climate
Ribeira da Isna, Portugal

Weather in December

The first month of the winter, December, is also a fresh month in Ribeira da Isna, Portugal, with temperature in the range of an average low of 4.9°C (40.8°F) and an average high of 12.6°C (54.7°F).

Temperature

In Ribeira da Isna, the average high-temperature is essentially the same as in November - a fresh 12.6°C (54.7°F). The average low-temperature, in Ribeira da Isna, is 4.9°C (40.8°F).

Humidity

In December, the average relative humidity is 79%.

Rainfall

In Ribeira da Isna, it is raining for 10.1 days, with typically 57mm (2.24") of accumulated precipitation. Throughout the year, in Ribeira da Isna, there are 97.2 rainfall days, and 371mm (14.61") of precipitation is accumulated.

Snowfall

February through December are months without snowfall.

Daylight

With an average of 9.4h of daylight, December has the shortest days of the year.

Sunshine

The average sunshine in Ribeira da Isna is 5.6h.

UV index

December is the month with the lowest UV index in Ribeira da Isna, Portugal, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low threat to health from unsafe exposure to the UV radiation for the ordinary person.
Note: The average daily UV index of 2 transform into the following instructions:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. 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 Ribeira da Isna?

In Ribeira da Isna, Portugal, in December, the average high-temperature is 12.6°C (54.7°F), and the average low-temperature is 4.9°C (40.8°F).

What is the average humidity in December in Ribeira da Isna?

In Ribeira da Isna, Portugal, the average relative humidity in December is 79%.

How many days does it rain in December in Ribeira da Isna?

In Ribeira da Isna, during December, the rain falls for 10.1 days and regularly aggregates up to 57mm (2.24") of precipitation.

Does it snow in Ribeira da Isna in December?

In Ribeira da Isna, in December, it doesn't snow. In January, it regularly snows.

When it does not snow in Ribeira da Isna?

In Ribeira da Isna snow does not fall in February through December.

What is the month with the shortest days in Ribeira da Isna?

With an average of 9.4h of daylight, December has the shortest days of the year in Ribeira da Isna.

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

In December, the average length of the day in Ribeira da Isna is 9.4h.

How long on average sun shines in December in Ribeira da Isna?

In December, the average sunshine is 5.6h.

What is the month with the lowest UV index in Ribeira da Isna?

December is the month with the lowest UV index, with an average maximum UV index of 2.

What is the UV index reading in December in Ribeira da Isna?

In December, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a minimal hazard to health from unsafe exposure to the Sun's UV rays.

Average temperature in December
Ribeira da Isna, Portugal

Average temperature in December - Ribeira da Isna, Portugal
  • Average high temperature in December: 12.6°C

The warmest month (with the highest average high temperature) is August (32.8°C).
The month with the lowest average high temperature is January (11.6°C).

  • Average low temperature in December: 4.9°C

The month with the highest average low temperature is July (17.2°C).
The coldest month (with the lowest average low temperature) is January (3.9°C).

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Average pressure in December
Ribeira da Isna, Portugal

Average pressure in December - Ribeira da Isna, Portugal
  • Average pressure in December: 1023mbar

The month with the highest atmospheric pressure is December (1023mbar).
The month with the lowest atmospheric pressure is April (1015.2mbar).

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Average wind speed in December
Ribeira da Isna, Portugal

Average wind speed in December - Ribeira da Isna, Portugal
  • Average wind speed in December: 9.5km/h

The windiest month (with the highest average wind speed) is February (11.3km/h).
The calmest month (with the lowest average wind speed) is September (8.3km/h).

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Average humidity in December
Ribeira da Isna, Portugal

Average humidity in December - Ribeira da Isna, Portugal
  • Average humidity in December: 79%

The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is August (44%).

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Average rainfall in December
Ribeira da Isna, Portugal

Average rainfall in December - Ribeira da Isna, Portugal
  • Average rainfall in December: 57mm

The wettest month (with the highest rainfall) is November (60mm).
The driest months (with the least rainfall) are July and August (3mm).

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Average rainfall days in December
Ribeira da Isna, Portugal

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

The month with the highest number of rainy days is November (12.3 days).
The month with the least rainy days is August (1.5 days).

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Average snowfall in December
Ribeira da Isna, Portugal

Average snowfall in December - Ribeira da Isna, Portugal
  • Average snowfall in December: 0mm

The month with the highest snowfall is January (1mm).
Months with the least snowfall are February, March, April, May, June, July, August, September, October, November and December (0mm).

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Average snowfall days in December
Ribeira da Isna, Portugal

Average snowfall days in December - Ribeira da Isna, Portugal
  • Average snowfall days in December: 0 days

Months with the highest number of snowfall days are January and March (0.1 days).
Months with the least snowfall days are February, April, May, June, July, August, September, October, November and December (0 days).

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Average daylight in December /
Average sunshine in December
Ribeira da Isna, Portugal

Average daylight in December / Average sunshine in December - Ribeira da Isna, Portugal
  • Average daylight in December: 9.4h

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.4h).

  • Average sunshine in December: 5.6h

Months with the most sunshine are July and August (Average sunshine: 11.8h).
The month with the least sunshine is January (Average sunshine: 5.2h).

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Average sunshine days in December
Ribeira da Isna, Portugal

Average sunshine days in December - Ribeira da Isna, Portugal
  • Average sunshine days in December: 19.9 days

The month with the most sunshine days is August (28.3 days).
The month with the least sunshine days is April (16.6 days).

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Average UV index in December
Ribeira da Isna, Portugal

Average UV index in December - Ribeira da Isna, Portugal
  • Average UV index in December: 2

Months with the highest UV index are May, June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 2).

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Average cloud cover in December
Ribeira da Isna, Portugal

Average cloud cover in December - Ribeira da Isna, Portugal
  • Average cloud cover in December: 38

The month with the most cloud cover is January (Cloud cover 42).
Months with the least cloud cover are July and August (Cloud cover 8).

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Average visibility in December
Ribeira da Isna, Portugal

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

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

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