December weather forecast and climate
Vale de Santiago, Portugal

Weather in December

December, the first month of the winter, in Vale de Santiago, is also an enjoyable month, with average temperature fluctuating between 16°C (60.8°F) and 12.5°C (54.5°F).

Temperature

In Vale de Santiago, the average high-temperature in December is almost the same as in November - a still comfortable 16°C (60.8°F). In Vale de Santiago, Portugal, in December, the average low-temperature is 12.5°C (54.5°F).

Humidity

In Vale de Santiago, the average relative humidity is 74%.

Rainfall

In Vale de Santiago, during 9.4 rainfall days, 42mm (1.65") of precipitation is typically accumulated. In Vale de Santiago, during the entire year, the rain falls for 94.7 days and collects up to 328mm (12.91") of precipitation.

Daylight

With an average of 9.6h of daylight, December has the shortest days of the year.

Sunshine

In December, the average sunshine in Vale de Santiago is 6.2h.

UV index

Months with the lowest UV index are January through April, November and December, with an average maximum UV index of 4. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 4 in December transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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 Vale de Santiago?

In Vale de Santiago, Portugal, in December, the average high-temperature is 16°C (60.8°F), and the average low-temperature is 12.5°C (54.5°F).

What is the average humidity in December in Vale de Santiago?

In Vale de Santiago, the average relative humidity in December is 74%.

How much does it rain in Vale de Santiago in December?

In Vale de Santiago, in December, it is raining for 9.4 days, with typically 42mm (1.65") of accumulated precipitation.

What is the month with the shortest days in Vale de Santiago?

With an average of 9.6h of daylight, December has the shortest days of the year in Vale de Santiago, Portugal.

How many hours of daylight does Vale de Santiago have in December?

The average length of the day in December in Vale de Santiago, Portugal, is 9.6h.

How many hours of sunshine does Vale de Santiago have in December?

The average sunshine in December in Vale de Santiago is 6.2h.

When is the lowest UV index in Vale de Santiago?

January through April, November and December, with an average maximum UV index of 4, are months with the lowest UV index in Vale de Santiago.

What is the UV index reading in December in Vale de Santiago?

In Vale de Santiago, Portugal, the average daily maximum UV index in December is 4. A UV Index estimate of 3 to 5 represents a medium hazard to health from the exposure to the Sun's UV rays.

Average temperature in December
Vale de Santiago, Portugal

Average temperature in December - Vale de Santiago, Portugal
  • Average high temperature in December: 16°C

The warmest month (with the highest average high temperature) is August (24.2°C).
The month with the lowest average high temperature is February (14.8°C).

  • Average low temperature in December: 12.5°C

Months with the highest average low temperature are August and September (18.8°C).
The coldest month (with the lowest average low temperature) is February (10.8°C).

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Average pressure in December
Vale de Santiago, Portugal

Average pressure in December - Vale de Santiago, 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 (1015.7mbar).

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Average wind speed in December
Vale de Santiago, Portugal

Average wind speed in December - Vale de Santiago, Portugal
  • Average wind speed in December: 18.1km/h

The windiest month (with the highest average wind speed) is February (19.4km/h).
The calmest month (with the lowest average wind speed) is September (15km/h).

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Average humidity in December
Vale de Santiago, Portugal

Average humidity in December - Vale de Santiago, Portugal
  • Average humidity in December: 74%

The month with the highest relative humidity is April (76%).
The month with the lowest relative humidity is October (72%).

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Average rainfall in December
Vale de Santiago, Portugal

Average rainfall in December - Vale de Santiago, Portugal
  • Average rainfall in December: 42mm

The wettest month (with the highest rainfall) is November (56mm).
The driest month (with the least rainfall) is July (1mm).

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Average rainfall days in December
Vale de Santiago, Portugal

Average rainfall days in December - Vale de Santiago, Portugal
  • Average rainfall days in December: 9.4 days

The month with the highest number of rainy days is November (13.4 days).
The month with the least rainy days is August (1.1 days).

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Average daylight in December /
Average sunshine in December
Vale de Santiago, Portugal

Average daylight in December / Average sunshine in December - Vale de Santiago, Portugal
  • Average daylight in December: 9.6h

The month with the longest days is June (Average daylight: 14.7h).
The month with the shortest days is December (Average daylight: 9.6h).

  • Average sunshine in December: 6.2h

The month with the most sunshine is July (Average sunshine: 11.5h).
The month with the least sunshine is January (Average sunshine: 5.7h).

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Average sunshine days in December
Vale de Santiago, Portugal

Average sunshine days in December - Vale de Santiago, Portugal
  • Average sunshine days in December: 20.4 days

The month with the most sunshine days is August (29.4 days).
The month with the least sunshine days is April (15.3 days).

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Average UV index in December
Vale de Santiago, Portugal

Average UV index in December - Vale de Santiago, Portugal
  • Average UV index in December: 4

Months with the highest UV index are June, July, August and September (UV index 6).
Months with the lowest UV index are January, February, March, April, November and December (UV index 4).

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Average cloud cover in December
Vale de Santiago, Portugal

Average cloud cover in December - Vale de Santiago, Portugal
  • Average cloud cover in December: 31

The month with the most cloud cover is January (Cloud cover 37).
The month with the least cloud cover is August (Cloud cover 10).

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Average visibility in December
Vale de Santiago, Portugal

Average visibility in December - Vale de Santiago, Portugal
  • Average visibility in December: 10km

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

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