December weather forecast and climate
Bernabela, Costa Rica

Weather in December

December, the first month of the winter, in Bernabela, is still a warm month, with average temperature ranging between max 29.9°C (85.8°F) and min 21.3°C (70.3°F).

Temperature

In Bernabela, Costa Rica, the average high-temperature is essentially the same as in November - a still warm 29.9°C (85.8°F). In December, in Bernabela, Costa Rica, the average low-temperature is 21.3°C (70.3°F).

Heat index

The average heat index in December is estimated at a very hot 36.8°C (98.2°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'apparent temperature', 'feels like', or 'real feel', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (wind, differences in body mass, height, and shape, clothing). Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

In December, the average relative humidity is 78%.

Rainfall

In Bernabela, in December, it is raining for 12.3 days, with typically 32mm (1.26") of accumulated precipitation. In Bernabela, during the entire year, the rain falls for 236.6 days and collects up to 1996mm (78.58") of precipitation.

Daylight

The month with the shortest days in Bernabela is December, with an average of 11.5h of daylight.

Sunshine

In Bernabela, the average sunshine in December is 9.6h.

UV index

January through September and December, with an average maximum UV index of 7, are months with the highest UV index in Bernabela. A UV Index estimate of 6 to 7 represents a high threat to health from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 7 interpret into the following advice:
Take precautions against overexposure. Protection against sun damage is needed. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. 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 Bernabela?

In Bernabela, in December, the average high-temperature is 29.9°C (85.8°F), and the average low-temperature is 21.3°C (70.3°F). The average heat index (a.k.a. 'feels like', 'real feel'), that combines relative humidity and air temperature, in December is appraised at 36.8°C (98.2°F).

What is the average humidity in December in Bernabela?

The average relative humidity in December in Bernabela is 78%.

How much does it rain in Bernabela in December?

In Bernabela, Costa Rica, in December, it is raining for 12.3 days, with typically 32mm (1.26") of accumulated precipitation.

What is the month with the shortest days in Bernabela?

The month with the shortest days in Bernabela is December, with an average of 11.5h of daylight.

How many hours of daylight does Bernabela have in December?

In Bernabela, the average length of the day in December is 11.5h.

How many hours of sunshine does Bernabela have in December?

In Bernabela, Costa Rica, the average sunshine in December is 9.6h.

What is the month with the highest UV index in Bernabela?

January through September and December, with an average maximum UV index of 7, are months with the highest UV index in Bernabela, Costa Rica.

How high is the UV index in December in Bernabela?

The average daily maximum UV index in December in Bernabela is 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from unprotected exposure to the UV radiation.

Average temperature in December
Bernabela, Costa Rica

Average temperature in December - Bernabela, Costa Rica
  • Average high temperature in December: 29.9°C

The warmest month (with the highest average high temperature) is April (34.4°C).
The month with the lowest average high temperature is October (28.7°C).

  • Average low temperature in December: 21.3°C

The month with the highest average low temperature is May (24.4°C).
The coldest month (with the lowest average low temperature) is January (21°C).

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Average pressure in December
Bernabela, Costa Rica

Average pressure in December - Bernabela, Costa Rica
  • Average pressure in December: 1010.5mbar

The month with the highest atmospheric pressure is January (1011mbar).
Months with the lowest atmospheric pressure are May, October and November (1010.2mbar).

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Average wind speed in December
Bernabela, Costa Rica

Average wind speed in December - Bernabela, Costa Rica
  • Average wind speed in December: 11.8km/h

The windiest month (with the highest average wind speed) is February (15km/h).
The calmest month (with the lowest average wind speed) is September (5.3km/h).

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Average humidity in December
Bernabela, Costa Rica

Average humidity in December - Bernabela, Costa Rica
  • Average humidity in December: 78%

The month with the highest relative humidity is October (88%).
The month with the lowest relative humidity is March (61%).

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Average rainfall in December
Bernabela, Costa Rica

Average rainfall in December - Bernabela, Costa Rica
  • Average rainfall in December: 32mm

The wettest month (with the highest rainfall) is October (427mm).
The driest months (with the least rainfall) are February and March (5mm).

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Average rainfall days in December
Bernabela, Costa Rica

Average rainfall days in December - Bernabela, Costa Rica
  • Average rainfall days in December: 12.3 days

The month with the highest number of rainy days is October (30.2 days).
The month with the least rainy days is February (3.5 days).

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Average daylight in December /
Average sunshine in December
Bernabela, Costa Rica

Average daylight in December / Average sunshine in December - Bernabela, Costa Rica
  • Average daylight in December: 11.5h

Months with the longest days are June and July (Average daylight: 12.7h).
The month with the shortest days is December (Average daylight: 11.5h).

  • Average sunshine in December: 9.6h

The month with the most sunshine is March (Average sunshine: 9.9h).
The month with the least sunshine is October (Average sunshine: 6.9h).

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Average sunshine days in December
Bernabela, Costa Rica

Average sunshine days in December - Bernabela, Costa Rica
  • Average sunshine days in December: 17.2 days

The month with the most sunshine days is January (25.3 days).
The month with the least sunshine days is October (0.5 days).

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Average UV index in December
Bernabela, Costa Rica

Average UV index in December - Bernabela, Costa Rica
  • Average UV index in December: 7

Months with the highest UV index are January, February, March, April, May, June, July, August, September and December (UV index 7).
Months with the lowest UV index are October and November (UV index 6).

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Average cloud cover in December
Bernabela, Costa Rica

Average cloud cover in December - Bernabela, Costa Rica
  • Average cloud cover in December: 20

The month with the most cloud cover is October (Cloud cover 52).
The month with the least cloud cover is February (Cloud cover 11).

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Average visibility in December
Bernabela, Costa Rica

Average visibility in December - Bernabela, Costa Rica
  • Average visibility in December: 9km

Months with the highest visibility are January, February, March and April (10km).
The month with the lowest visibility is October (7km).

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