December weather forecast and climate
Casitas, Costa Rica

Weather in December

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

Temperature

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

Heat index

In December, the average heat index is appraised at a sweltering 36.8°C (98.2°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'feels like', 'real feel', or 'felt air temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. This effect is individual, with diverse people perceiving weather differently for numerous reasons (pregnancy, wind, metabolic differences), and activity. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. 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. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. 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

The average relative humidity in Casitas is 78%.

Rainfall

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

Daylight

December has the shortest days of the year, with an average of 11.5h of daylight.

Sunshine

In Casitas, Costa Rica, the average sunshine 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 Casitas, Costa Rica. A UV Index reading of 6 to 7 represents a high health hazard from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: In December, the average maximum UV index of 7 translate into the following recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. 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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in December in Casitas?

The average high-temperature, in December, in Casitas, Costa Rica, is 29.9°C (85.8°F), while the average low-temperature is 21.3°C (70.3°F). The average heat index (a.k.a. 'feels like', 'felt air temperature'), that factores the actual air temperature with the relative humidity, in December is evaluated at 36.8°C (98.2°F).

What is the average humidity in December in Casitas?

The average relative humidity in December is 78%.

How many days does it rain in December in Casitas?

In December, the rain falls for 12.3 days. Throughout December, 32mm (1.26") of precipitation is accumulated.

What is the month with the shortest days in Casitas?

December has the shortest days of the year in Casitas, Costa Rica, with an average of 11.5h of daylight.

How many hours of daylight does Casitas have in December?

The average length of the day in December is 11.5h.

How many hours of sunshine does Casitas have in December?

The average sunshine in December is 9.6h.

What are the months with the highest UV index in Casitas?

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

What is the UV index intensity in December in Casitas?

The average daily maximum UV index in December in Casitas is 7. A UV Index of 6 to 7 symbolizes a high health threat from unprotected exposure to the UV radiation.

Average temperature in December
Casitas, Costa Rica

Average temperature in December - Casitas, 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
Casitas, Costa Rica

Average pressure in December - Casitas, 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
Casitas, Costa Rica

Average wind speed in December - Casitas, 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
Casitas, Costa Rica

Average humidity in December - Casitas, 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
Casitas, Costa Rica

Average rainfall in December - Casitas, 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
Casitas, Costa Rica

Average rainfall days in December - Casitas, 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
Casitas, Costa Rica

Average daylight in December / Average sunshine in December - Casitas, 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
Casitas, Costa Rica

Average sunshine days in December - Casitas, 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
Casitas, Costa Rica

Average UV index in December - Casitas, 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
Casitas, Costa Rica

Average cloud cover in December - Casitas, 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
Casitas, Costa Rica

Average visibility in December - Casitas, 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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