December weather forecast
Jaris, Costa Rica

December

Weather in December

December, the first month of the winter in Jaris, is also a moderately hot month, with an average temperature ranging between min 15.7°C (60.3°F) and max 25.1°C (77.2°F).

Temperature

The arrival of December sees an average high-temperature of a still moderately hot 25.1°C (77.2°F), hardly diverging from November's 24.5°C (76.1°F). Nighttime temperatures consistently average a moderate 15.7°C (60.3°F) during December.

Humidity

The average relative humidity in December is 81%.

Rainfall

In Jaris, during December, the rain falls for 20.8 days and regularly aggregates up to 61mm (2.4") of precipitation. Throughout the year, there are 289.2 rainfall days, and 2603mm (102.48") of precipitation is accumulated.

Daylight

With an average of 11h and 36min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 05:38 and sunset at 17:14. On the last day of December, sunrise is at 05:53 and sunset at 17:27 CST.

Sunshine

In Jaris, the average sunshine in December is 8.3h.

UV index

The months with the lowest UV index are January, February, May through December, with an average maximum UV index of 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: The maximum UV index, 5 during December, leads to the following recommendations:
Undertake precautions - It is suggested to shield oneself from sunburn. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.

Frequently asked questions

What is the average December temperature?
During December, Jaris experiences an average high-temperature of 25.1°C (77.2°F) and a low-temperature of 15.7°C (60.3°F). In April, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which factors the actual air temperature with the relative humidity, is calculated to be 31°C (87.8°F).
What is the average humidity in December?
The average relative humidity in December is 81%.
How much does it rain in December?
In December, the rain falls for 20.8 days. Throughout December, 61mm (2.4") of precipitation is accumulated.
What is the month with the shortest days in Jaris?
With an average of 11h and 36min of daylight, December has the shortest days of the year.
How many hours of daylight does Jaris have in December?
In December, the average day length is 11h and 34min.
When are sunrise and sunset in December?
On the first day of December, sunrise is at 05:38 and sunset at 17:14. On the last day of the month, sunrise is at 05:53 and sunset at 17:27 CST.
How many hours of sunshine does Jaris have in December?
The average sunshine duration in December is 8.3h.
When is the lowest UV index in Jaris?
The months with the lowest UV index are January, February, May through December, with an average maximum UV index of 5.
How high is the UV index in December?
The average daily maximum UV index in December is 5. A UV Index estimate of 3 to 5 represents a moderate vulnerability 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
Jaris, Costa Rica
  • Average high temperature in December: 25.1°C

The warmest month (with the highest average high temperature) is April (28°C).
The month with the lowest average high temperature is October (23.7°C).

  • Average low temperature in December: 15.7°C

The month with the highest average low temperature is May (18.5°C).
The coldest month (with the lowest average low temperature) is January (15.3°C).

Average pressure in December
Jaris, Costa Rica
  • Average pressure in December: 1011.6mbar

The month with the highest atmospheric pressure is January (1012.2mbar).
The month with the lowest atmospheric pressure is October (1010.8mbar).

Average wind speed in December
Jaris, Costa Rica
  • Average wind speed in December: 9.1km/h

The windiest month (with the highest average wind speed) is February (10.9km/h).
The calmest month (with the lowest average wind speed) is September (3.9km/h).

Average humidity in December
Jaris, Costa Rica
  • Average humidity in December: 81%

The month with the highest relative humidity is October (90%).
The month with the lowest relative humidity is March (71%).

Average rainfall in December
Jaris, Costa Rica
  • Average rainfall in December: 61mm

The wettest month (with the highest rainfall) is October (429mm).
The driest month (with the least rainfall) is February (24mm).

Average rainfall days in December
Jaris, Costa Rica
  • Average rainfall days in December: 20.8 days

The month with the highest number of rainy days is October (30.5 days).
The month with the least rainy days is February (11.8 days).

Average daylight in December /
Average sunshine in December
Jaris, Costa Rica
  • Average daylight in December: 11h and 4min

The month with the longest days is June (Average daylight: 12h and 42min).
The month with the shortest days is December (Average daylight: 11h and 36min).

  • Average sunshine in December: 8h and 2min

The month with the most sunshine is February (Average sunshine: 9h and 24min).
The month with the least sunshine is October (Average sunshine: 6h and 6min).

Average sunshine days in December
Jaris, Costa Rica
  • Average sunshine days in December: 7.5 days

The month with the most sunshine days is February (13.1 days).
The month with the least sunshine days is July (0.3 days).

Average UV index in December
Jaris, Costa Rica
  • Average UV index in December: 5

The months with the highest UV index are March and April (UV index 6).
The months with the lowest UV index are January, February, May, June, July, August, September, October, November and December (UV index 5).

Average cloud cover in December
Jaris, Costa Rica
  • Average cloud cover in December: 38

The month with the most cloud cover is October (Cloud cover 63).
The month with the least cloud cover is February (Cloud cover 23).

Average visibility in December
Jaris, Costa Rica
  • Average visibility in December: 8km

The months with the highest visibility are January, February, March and April (9km).
The months with the lowest visibility are September and October (6km).

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