December weather forecast and climate
Cartagena, Costa Rica

Weather in December

December, the first month of the winter, in Cartagena, is still a warm month, with average temperature varying between 29.5°C (85.1°F) and 23.3°C (73.9°F).

Temperature

In December, the average high-temperature is relatively the same as in November - a still moderately hot 29.5°C (85.1°F). The average low-temperature, in December, is 23.3°C (73.9°F).

Heat index

The average heat index is estimated at a very hot 35.4°C (95.7°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. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'real feel', 'apparent temperature', or 'feels like', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (clothing, differences in body mass, height, and shape, wind). 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. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 37.5°C (99.5°F) to 38.3°C (100.9°F), thermal conditions are potentially life-threatening.

Humidity

In December, the average relative humidity is 77%.

Rainfall

In Cartagena, it is raining for 2.9 days, with typically 4mm (0.16") of accumulated precipitation. In Cartagena, Costa Rica, during the entire year, the rain falls for 137.5 days and collects up to 624mm (24.57") of precipitation.

Daylight

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

Sunshine

In Cartagena, the average sunshine is 9.6h.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index. Months with the lowest UV index are January through December, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 7 in December transform into the following instructions:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. 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 Cartagena?

In Cartagena, Costa Rica, in December, the average high-temperature is 29.5°C (85.1°F), and the average low-temperature is 23.3°C (73.9°F). In December, the average heat index (a.k.a. 'feels like', 'felt air temperature'), that combines both air temperature and relative humidity, is estimated at 35.4°C (95.7°F).

What is the average humidity in December in Cartagena?

In December, the average relative humidity in Cartagena is 77%.

How much does it rain in Cartagena in December?

In Cartagena, in December, it is raining for 2.9 days, with typically 4mm (0.16") of accumulated precipitation.

What is the month with the shortest days in Cartagena?

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

What is the average length of the day in December in Cartagena?

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

How many hours of sunshine does Cartagena have in December?

The average sunshine in December in Cartagena, Costa Rica, is 9.6h.

When is the highest UV index in Cartagena?

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

What is the month with the lowest UV index in Cartagena?

January through December, with an average maximum UV index of 7, are months with the lowest UV index.

How high is the UV index in December in Cartagena?

In Cartagena, the average daily maximum UV index in December is 7. A UV Index value of 6 to 7 symbolizes a high hazard to health from unsafe exposure to the Sun's UV rays.

Average temperature in December
Cartagena, Costa Rica

Average temperature in December - Cartagena, Costa Rica
  • Average high temperature in December: 29.5°C

The warmest month (with the highest average high temperature) is April (33.4°C).
The month with the lowest average high temperature is October (28.7°C).

  • Average low temperature in December: 23.3°C

The month with the highest average low temperature is May (25.8°C).
The coldest month (with the lowest average low temperature) is January (23°C).

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Average pressure in December
Cartagena, Costa Rica

Average pressure in December - Cartagena, Costa Rica
  • Average pressure in December: 1010.6mbar

The month with the highest atmospheric pressure is January (1011.1mbar).
The month with the lowest atmospheric pressure is October (1010.1mbar).

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Average wind speed in December
Cartagena, Costa Rica

Average wind speed in December - Cartagena, Costa Rica
  • Average wind speed in December: 17.7km/h

The windiest month (with the highest average wind speed) is February (21.9km/h).
The calmest month (with the lowest average wind speed) is September (7.9km/h).

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Average humidity in December
Cartagena, Costa Rica

Average humidity in December - Cartagena, Costa Rica
  • Average humidity in December: 77%

The month with the highest relative humidity is October (84%).
Months with the lowest relative humidity are March and April (65%).

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Average rainfall in December
Cartagena, Costa Rica

Average rainfall in December - Cartagena, Costa Rica
  • Average rainfall in December: 4mm

The wettest month (with the highest rainfall) is October (177mm).
The driest months (with the least rainfall) are February and March (1mm).

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Average rainfall days in December
Cartagena, Costa Rica

Average rainfall days in December - Cartagena, Costa Rica
  • Average rainfall days in December: 2.9 days

The month with the highest number of rainy days is October (22.5 days).
The month with the least rainy days is February (0.8 days).

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

Average daylight in December / Average sunshine in December - Cartagena, 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 July (Average sunshine: 10.7h).
The month with the least sunshine is January (Average sunshine: 7.6h).

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Average sunshine days in December
Cartagena, Costa Rica

Average sunshine days in December - Cartagena, Costa Rica
  • Average sunshine days in December: 27.7 days

The month with the most sunshine days is March (30.1 days).
The month with the least sunshine days is October (7 days).

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Average UV index in December
Cartagena, Costa Rica

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

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

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Average cloud cover in December
Cartagena, Costa Rica

Average cloud cover in December - Cartagena, Costa Rica
  • Average cloud cover in December: 16

The month with the most cloud cover is October (Cloud cover 43).
The month with the least cloud cover is February (Cloud cover 9).

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Average visibility in December
Cartagena, Costa Rica

Average visibility in December - Cartagena, Costa Rica
  • 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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