December weather forecast
Apatou, French Guiana

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Weather in December

December, wrapping up the year in Apatou, French Guiana, ushers more rainfall, higher than the previous month of November. With relatively more cloud cover than in November, sunlight becomes a lesser regular feature. The temperatures maintain the standard ranges, while humidity increases, providing ample moisture for the surrounding greenery. Meanwhile, wind speed sees a nominal rise compared to November, adding a breeze to the rain-enriched atmosphere. December, although wetter, is far from the peak monsoon season, and lets the city dwell in a pleasantly moist climate.

Temperature

During December, the average high-temperature is a still tropical 30.2°C (86.4°F), maintaining a close resemblance to that of the preceding month. In December, Apatou's temperature tends to fall to an average low of 22.7°C (72.9°F) during the night.

Heat index

The heat index value for December is evaluated at a torrid 39°C (102.2°F). Implement enhanced safety actions, heat cramps and heat exhaustion could occur. Sustained activity might result in heatstroke.
It is crucial to understand that heat index figures are for shade and gentle wind conditions. Exposure to unobstructed sunshine could lead to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is found by incorporating humidity levels into the air temperature measurement. The influence of weather is personal, differing among individuals based on variations in body mass, stature, and the degree of physical exertion. When exposed to direct sunlight, it's possible for the heat index to increase by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Youths are typically more endangered than adults since they usually sweat less. Their larger skin surface concerning their smaller bodies and higher heat production due to activity further adds to their vulnerability.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. With higher relative humidity, the rate of evaporation is reduced, resulting in increased heat retention in the body compared to drier air. Heat disorders may be on the horizon when body temperatures rise from inadequate heat management.

Humidity

In Apatou, the average relative humidity in December is 83%.

Rainfall

In December, the rain falls for 21.9 days. Throughout December, 84mm (3.31") of precipitation is accumulated. In Apatou, during the entire year, the rain falls for 253 days and collects up to 878mm (34.57") of precipitation.

Daylight

With an average of 11h and 48min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 06:31 and sunset at 18:21. On the last day of the month, sunrise is at 06:45 and sunset at 18:35 -03.

Sunshine

In Apatou, the average sunshine in December is 6.6h.

UV index

The months with the lowest UV index are January through June and December, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The average daily UV index of 6 in December transforms into the following instructions:
Take precautions against overexposure. Protection against sun damage is needed. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. Opt for tightly woven and loose clothing to enhance protection from the Sun.

Frequently asked questions

Is it hot during December?

December temperatures vary between a high-temperature of 30.2°C (86.4°F) and a low-temperature of 22.7°C (72.9°F). The average heat index (a.k.a. 'feels like', 'apparent temperature'), which combines relative humidity and air temperature, in December is evaluated at 39°C (102.2°F).

What is the average humidity in December?

The average relative humidity in December is 83%.

How much does it rain in December?

In December, the rain falls for 21.9 days. Throughout December, 84mm (3.31") of precipitation is accumulated.

What is the month with the shortest days?

With an average of 11h and 48min of daylight, December has the shortest days of the year.

What is the average length of the day in December?

In December, the average day length is 11h and 50min.

When is the sunrise / sunset in December?

On the first day of December, sunrise is at 06:31 and sunset at 18:21. On the last day of the month, sunrise is at 06:45 and sunset at 18:35 -03.

How long on average sun shines in December?

The average sunshine duration in December is 6.6h.

What are the months with the lowest UV index in Apatou?

January through June and December, with an average maximum UV index of 6, are months with the lowest UV index.

How high is the UV index in December?

In December, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Apatou, French Guiana

Average temperature in December - Apatou, French Guiana
  • Average high temperature in December: 30.2°C

The warmest month (with the highest average high temperature) is October (33.1°C).
The month with the lowest average high temperature is February (29.1°C).

  • Average low temperature in December: 22.7°C

The month with the highest average low temperature is May (23.3°C).
The coldest month (with the lowest average low temperature) is July (22.2°C).

Average pressure in December
Apatou, French Guiana

Average pressure in December - Apatou, French Guiana
  • Average pressure in December: 1010.9mbar

The months with the highest atmospheric pressure are June and July (1012.9mbar).
The month with the lowest atmospheric pressure is November (1009.5mbar).

Average wind speed in December
Apatou, French Guiana

Average wind speed in December - Apatou, French Guiana
  • Average wind speed in December: 8.7km/h

The windiest months (with the highest average wind speed) are February and March (9.5km/h).
The calmest month (with the lowest average wind speed) is July (6.4km/h).

Average humidity in December
Apatou, French Guiana

Average humidity in December - Apatou, French Guiana
  • Average humidity in December: 83%

The month with the highest relative humidity is June (88%).
The month with the lowest relative humidity is October (77%).

Average rainfall in December
Apatou, French Guiana

Average rainfall in December - Apatou, French Guiana
  • Average rainfall in December: 84mm

The wettest month (with the highest rainfall) is May (137mm).
The driest month (with the least rainfall) is October (23mm).

Average rainfall days in December
Apatou, French Guiana

Average rainfall days in December - Apatou, French Guiana
  • Average rainfall days in December: 21.9 days

The month with the highest number of rainy days is May (28 days).
The month with the least rainy days is September (11.5 days).

Average daylight in December /
Average sunshine in December
Apatou, French Guiana

Average daylight in December / Average sunshine in December - Apatou, French Guiana
  • Average daylight in December: 11h and 5min

The month with the longest days is June (Average daylight: 12h and 24min).
The month with the shortest days is December (Average daylight: 11h and 48min).

  • Average sunshine in December: 6h and 4min

The month with the most sunshine is September (Average sunshine: 9h and 6min).
The month with the least sunshine is February (Average sunshine: 5h and 6min).

Average sunshine days in December
Apatou, French Guiana

Average sunshine days in December - Apatou, French Guiana
  • Average sunshine days in December: 6.4 days

The month with the most sunshine days is October (16 days).
The month with the least sunshine days is May (1.8 days).

Average UV index in December
Apatou, French Guiana

Average UV index in December - Apatou, French Guiana
  • Average UV index in December: 6

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

Average cloud cover in December
Apatou, French Guiana

Average cloud cover in December - Apatou, French Guiana
  • Average cloud cover in December: 54

The month with the most cloud cover is February (Cloud cover 62).
The month with the least cloud cover is September (Cloud cover 34).

Average visibility in December
Apatou, French Guiana

Average visibility in December - Apatou, French Guiana
  • Average visibility in December: 8km

The months with the highest visibility are February, March and April (9km).
The months with the lowest visibility are June, July and August (7km).

Apatou, French Guiana

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