December weather forecast
Cabo Polonio, Uruguay

December

Weather in December

Cabo Polonio in December is the epitome of summer's arrival. The transformation from the pleasant weather of November to the intense heat of January is clear cut. Offering the longest daylight duration of 14.4 hours, the sky stays clear for extensive spells. Combined with the falling relative humidity to 69%, the season fortifies its sunny credentials. The radiant sun dominates the landscape, paving the way for warmer temperatures and setting the stage for a typical summer narrative.

Temperature

As December begins, there's a slight increase in the average high-temperature, moving from a moderately hot 23.4°C (74.1°F) in November to a still warm 26.4°C (79.5°F). The average temperature drops to a refreshing 16.1°C (61°F) during the night in the month of December.

Humidity

The average relative humidity in December is 69%.

Rainfall

In Cabo Polonio, during December, the rain falls for 10.7 days and regularly aggregates up to 53mm (2.09") of precipitation. Throughout the year, there are 129.5 rainfall days, and 692mm (27.24") of precipitation is accumulated.

Daylight

The month with the longest days is December, with an average of 14h and 24min of daylight.
On the first day of the month, sunrise is at 05:15 and sunset at 19:33. On the last day of December, sunrise is at 05:26 and sunset at 19:50 -03.

Sunshine

In Cabo Polonio, the average sunshine in December is 10.2h.

UV index

January through March and December, with an average maximum UV index of 6, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for average individuals.
Note: The maximum daily UV index of 6 during December translates into the following directions:
Skirt overexposure. People with light complexions might get scorched in under 20 minutes. Limit your exposure to the sun's UV radiation, which is strongest between 10 a.m. and 4 p.m., and note that parasols or canopies may not provide full sun protection. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.

Frequently asked questions

What is the usual temperature for Cabo Polonio in December?
The high-temperature during December is 26.4°C (79.5°F) and the low-temperature is 16.1°C (61°F). The average heat index (a.k.a. 'feels like', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, in February is estimated at 29°C (84.2°F).
What is the average humidity in December?
In December, the average relative humidity is 69%.
How much does it rain in December?
In Cabo Polonio, in December, it is raining for 10.7 days, with typically 53mm (2.09") of accumulated precipitation.
When are the longest days?
December has the longest days of the year, with an average of 14h and 24min of daylight.
How many hours of daylight does Cabo Polonio have in December?
In Cabo Polonio, the average day length in December is 14h and 25min.
When are sunrise and sunset in December?
On the first day of December, sunrise is at 05:15 and sunset at 19:33. On the last day of the month, sunrise is at 05:26 and sunset at 19:50 -03.
How long on average sun shines in December?
In December, the average sunshine duration is 10.2h.
What is the month with the highest UV index?
January through March and December, with an average maximum UV index of 6, are months with the highest UV index.
What is the UV index intensity in December?
In December, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high health risk from exposure to Sun's UV rays.
Average high temperature
Average low temperature
Average wind speed
Average max. wind speed
Average wind speed gusts
Average humidity
Average rainfall
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility
Average temperature in December - Cabo Polonio, Uruguay
Average temperature in December
Cabo Polonio, Uruguay
  • Average high temperature in December: 26.4°C

The warmest month (with the highest average high temperature) is January (28.1°C).
The month with the lowest average high temperature is July (14.6°C).

  • Average low temperature in December: 16.1°C

The month with the highest average low temperature is February (18.3°C).
The coldest month (with the lowest average low temperature) is July (7.9°C).

Average pressure in December - Cabo Polonio, Uruguay
Average pressure in December
Cabo Polonio, Uruguay
  • Average pressure in December: 1011.7mbar

The month with the highest atmospheric pressure is July (1019.1mbar).
The month with the lowest atmospheric pressure is December (1011.7mbar).

Average wind speed in December - Cabo Polonio, Uruguay
Average wind speed in December
Cabo Polonio, Uruguay
  • Average wind speed in December: 16.7km/h

The windiest month (with the highest average wind speed) is September (17.6km/h).
The calmest month (with the lowest average wind speed) is May (14.7km/h).

Average humidity in December - Cabo Polonio, Uruguay
Average humidity in December
Cabo Polonio, Uruguay
  • Average humidity in December: 69%

The month with the highest relative humidity is July (80%).
The month with the lowest relative humidity is January (68%).

Average rainfall in December - Cabo Polonio, Uruguay
Average rainfall in December
Cabo Polonio, Uruguay
  • Average rainfall in December: 53mm

The wettest month (with the highest rainfall) is August (84mm).
The driest month (with the least rainfall) is March (45mm).

Average rainfall days in December - Cabo Polonio, Uruguay
Average rainfall days in December
Cabo Polonio, Uruguay
  • Average rainfall days in December: 10.7 days

The months with the highest number of rainy days are March and October (12 days).
The month with the least rainy days is June (9.1 days).

Average daylight in December / Average sunshine in December - Cabo Polonio, Uruguay
Average daylight in December /
Average sunshine in December
Cabo Polonio, Uruguay
  • Average daylight in December: 14h and 2min

The month with the longest days is December (Average daylight: 14h and 24min).
The month with the shortest days is June (Average daylight: 9h and 54min).

  • Average sunshine in December: 10h and 1min

The month with the most sunshine is January (Average sunshine: 10h and 30min).
The month with the least sunshine is July (Average sunshine: 5h and 24min).

Average sunshine days in December - Cabo Polonio, Uruguay
Average sunshine days in December
Cabo Polonio, Uruguay
  • Average sunshine days in December: 18.6 days

The month with the most sunshine days is January (19.4 days).
The month with the least sunshine days is February (15.3 days).

Average UV index in December - Cabo Polonio, Uruguay
Average UV index in December
Cabo Polonio, Uruguay
  • Average UV index in December: 6

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

Average cloud cover in December - Cabo Polonio, Uruguay
Average cloud cover in December
Cabo Polonio, Uruguay
  • Average cloud cover in December: 28

The month with the most cloud cover is September (Cloud cover 42).
The month with the least cloud cover is January (Cloud cover 26).

Average visibility in December - Cabo Polonio, Uruguay
Average visibility in December
Cabo Polonio, Uruguay
  • Average visibility in December: 10km

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

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