December weather forecast and climate
Rio Bom, Portugal

Weather in December

December, the first month of the winter, in Rio Bom, is also a frosty month, with average temperature varying between 9.8°C (49.6°F) and 2.5°C (36.5°F).

Temperature

In Rio Bom, the average high-temperature in December is almost the same as in November - a frosty 9.8°C (49.6°F). In December, the average low-temperature is 2.5°C (36.5°F).

Humidity

In December, the average relative humidity is 86%.

Rainfall

The month with the most rainfall in Rio Bom is December when the rain falls for 12.4 days and typically aggregates up to 72mm (2.83") of precipitation.

Snowfall

In Rio Bom snow does not fall in March through December.

Daylight

December has the shortest days of the year in Rio Bom, with an average of 9.3h of daylight.

Sunshine

In December, the average sunshine is 4.9h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Rio Bom. A UV Index value of 2, and less, symbolizes a low threat to health from unprotected exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 2 in December interpret into the following advice:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in December in Rio Bom?

In Rio Bom, in December, the average high-temperature is 9.8°C (49.6°F), and the average low-temperature is 2.5°C (36.5°F).

What is the average humidity in December in Rio Bom?

The average relative humidity in December in Rio Bom, Portugal, is 86%.

How many days does it rain in December in Rio Bom?

In Rio Bom, in December, it is raining for 12.4 days, with typically 72mm (2.83") of accumulated precipitation.

What is the wettest month in Rio Bom?

The month with the most rainfall in Rio Bom, Portugal, is December when the rain falls for 12.4 days and typically aggregates up to 72mm (2.83") of precipitation.

Does it snow in Rio Bom in December?

In Rio Bom, Portugal, in December, it doesn't snow. In January, it regularly snows.

When it does not snow in Rio Bom?

March through December are months without snowfall.

What is the month with the shortest days in Rio Bom?

With an average of 9.3h of daylight, December has the shortest days of the year.

What is the average length of the day in December in Rio Bom?

In December, the average length of the day in Rio Bom, Portugal, is 9.3h.

How many hours of sunshine does Rio Bom have in December?

In December, the average sunshine in Rio Bom is 4.9h.

What is the month with the lowest UV index in Rio Bom?

Months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.

What is the UV index intensity in December in Rio Bom?

In Rio Bom, Portugal, the average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to the UV radiation.

Average temperature in December
Rio Bom, Portugal

Average temperature in December - Rio Bom, Portugal
  • Average high temperature in December: 9.8°C

The warmest month (with the highest average high temperature) is August (29.1°C).
The month with the lowest average high temperature is January (8.9°C).

  • Average low temperature in December: 2.5°C

Months with the highest average low temperature are July and August (13.1°C).
The coldest month (with the lowest average low temperature) is February (1.5°C).

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Average pressure in December
Rio Bom, Portugal

Average pressure in December - Rio Bom, Portugal
  • Average pressure in December: 1022.7mbar

The month with the highest atmospheric pressure is December (1022.7mbar).
The month with the lowest atmospheric pressure is April (1015.3mbar).

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Average wind speed in December
Rio Bom, Portugal

Average wind speed in December - Rio Bom, Portugal
  • Average wind speed in December: 6.7km/h

The windiest month (with the highest average wind speed) is March (8.3km/h).
The calmest months (with the lowest average wind speed) are September and October (6.5km/h).

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Average humidity in December
Rio Bom, Portugal

Average humidity in December - Rio Bom, Portugal
  • Average humidity in December: 86%

The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is August (56%).

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Average rainfall in December
Rio Bom, Portugal

Average rainfall in December - Rio Bom, Portugal
  • Average rainfall in December: 72mm

The wettest month (with the highest rainfall) is December (72mm).
The driest months (with the least rainfall) are July and August (11mm).

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Average rainfall days in December
Rio Bom, Portugal

Average rainfall days in December - Rio Bom, Portugal
  • Average rainfall days in December: 12.4 days

The month with the highest number of rainy days is April (14.6 days).
The month with the least rainy days is August (3.8 days).

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Average snowfall in December
Rio Bom, Portugal

Average snowfall in December - Rio Bom, Portugal
  • Average snowfall in December: 0mm

The month with the highest snowfall is February (5mm).
Months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0mm).

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Average snowfall days in December
Rio Bom, Portugal

Average snowfall days in December - Rio Bom, Portugal
  • Average snowfall days in December: 0.1 days

The month with the highest number of snowfall days is January (0.3 days).
Months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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Average daylight in December /
Average sunshine in December
Rio Bom, Portugal

Average daylight in December / Average sunshine in December - Rio Bom, Portugal
  • Average daylight in December: 9.3h

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in December: 4.9h

The month with the most sunshine is July (Average sunshine: 11.5h).
The month with the least sunshine is January (Average sunshine: 4.4h).

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Average sunshine days in December
Rio Bom, Portugal

Average sunshine days in December - Rio Bom, Portugal
  • Average sunshine days in December: 17.1 days

The month with the most sunshine days is August (25.5 days).
The month with the least sunshine days is November (13.5 days).

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Average UV index in December
Rio Bom, Portugal

Average UV index in December - Rio Bom, 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 Bom, Portugal

Average cloud cover in December - Rio Bom, Portugal
  • Average cloud cover in December: 49

The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 16).

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Average visibility in December
Rio Bom, Portugal

Average visibility in December - Rio Bom, Portugal
  • Average visibility in December: 7km

The month with the highest visibility is August (10km).
The month with the lowest visibility is January (6km).

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