December weather forecast
Bienvenue, French Guiana

Weather in December

The first month of the winter, December, is still a warm month in Bienvenue, French Guiana, with an average temperature fluctuating between 22°C (71.6°F) and 29.8°C (85.6°F).

Temperature

In December, the average high-temperature slightly decreases from a hot 33°C (91.4°F) in November to a warm 29.8°C (85.6°F). In December, in Bienvenue, French Guiana, the average low-temperature is 22°C (71.6°F).

Heat index

In December, the average heat index is calculated to be a torrid 38.8°C (101.8°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Note that heat index values are valued for light wind and location in the shade. With 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 'apparent temperature', 'feels like', 'felt air temperature', or 'real feel', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. Additional factors like wind, differences in body mass, height, and shape, pregnancy, and activity influence one's weather impression. Be aware that direct exposure to sunlight increases heat impact and may raise the 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.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. 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 December is 86%.

Rainfall

In Bienvenue, during 25.1 rainfall days, 146mm (5.75") of precipitation is typically accumulated. Throughout the year, in Bienvenue, French Guiana, there are 270.6 rainfall days, and 1131mm (44.53") of precipitation is accumulated.

Daylight

The month with the shortest days in Bienvenue is December, with an average of 11h and 57min of daylight.
On the first day of the month, sunrise is at 06:21 and sunset at 18:18. On the last day of December, in Bienvenue, sunrise is at 06:35 and sunset at 18:32 -03.

Sunshine

In December, the average sunshine is 5.9h.

UV index

January through July, November and December, with an average maximum UV index of 6, are months with the lowest UV index. A UV Index reading of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for average individuals.
Note: In December, the average maximum UV index of 6 translate into the following recommendations:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. 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 the 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.
[Resources]

FAQ

What is the temperature in December in Bienvenue?

In December, in Bienvenue, French Guiana, the average high-temperature is 29.8°C (85.6°F), and the average low-temperature is 22°C (71.6°F). In December, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which combines air temperature and relative humidity, is calculated to be 38.8°C (101.8°F).

What is the average humidity in December in Bienvenue?

In December, the average relative humidity is 86%.

How many days does it rain in December in Bienvenue?

In Bienvenue, French Guiana, in December, it is raining for 25.1 days, with typically 146mm (5.75") of accumulated precipitation.

What is the month with the shortest days in Bienvenue?

The month with the shortest days in Bienvenue, French Guiana, is December, with an average of 11h and 57min of daylight.

How many hours of daylight does Bienvenue have in December?

In December, the average day length in Bienvenue, French Guiana, is 11h and 57min.

When is the sunrise / sunset in December in Bienvenue?

In December, on the first day of the month, sunrise is at 06:21 and sunset at 18:18. On the last day of the month, in Bienvenue, sunrise is at 06:35 and sunset at 18:32 -03.

How many hours of sunshine does Bienvenue have in December?

In Bienvenue, French Guiana, the average sunshine duration in December is 5.9h.

When is the lowest UV index in Bienvenue?

The months with the lowest UV index in Bienvenue are January through July, November and December, with an average maximum UV index of 6.

What is the UV index reading in December in Bienvenue?

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

Average temperature in December
Bienvenue, French Guiana

Average temperature in December - Bienvenue, French Guiana
  • Average high temperature in December: 29.8°C

The warmest month (with the highest average high temperature) is October (34.3°C).
The month with the lowest average high temperature is February (27.9°C).

  • Average low temperature in December: 22°C

The month with the highest average low temperature is April (22.4°C).
The coldest month (with the lowest average low temperature) is July (21.3°C).

[Resources]

Average pressure in December
Bienvenue, French Guiana

Average pressure in December - Bienvenue, French Guiana
  • Average pressure in December: 1010.8mbar

The month with the highest atmospheric pressure is July (1013.2mbar).
The month with the lowest atmospheric pressure is November (1009.8mbar).

[Resources]

Average wind speed in December
Bienvenue, French Guiana

Average wind speed in December - Bienvenue, French Guiana
  • Average wind speed in December: 5.6km/h

The windiest month (with the highest average wind speed) is October (6.1km/h).
The calmest month (with the lowest average wind speed) is June (4.2km/h).

[Resources]

Average humidity in December
Bienvenue, French Guiana

Average humidity in December - Bienvenue, French Guiana
  • Average humidity in December: 86%

The month with the highest relative humidity is May (91%).
The month with the lowest relative humidity is October (75%).

[Resources]

Average rainfall in December
Bienvenue, French Guiana

Average rainfall in December - Bienvenue, French Guiana
  • Average rainfall in December: 146mm

The wettest month (with the highest rainfall) is May (195mm).
The driest month (with the least rainfall) is September (21mm).

[Resources]

Average rainfall days in December
Bienvenue, French Guiana

Average rainfall days in December - Bienvenue, French Guiana
  • Average rainfall days in December: 25.1 days

The month with the highest number of rainy days is May (28.9 days).
The month with the least rainy days is October (12 days).

[Resources]

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

Average daylight in December / Average sunshine in December - Bienvenue, French Guiana
  • Average daylight in December: 11h and 57min

The month with the longest days is June (Average daylight: 12h and 18min).
The month with the shortest days is December (Average daylight: 11h and 57min).

  • Average sunshine in December: 5h and 54min

The month with the most sunshine is September (Average sunshine: 8h and 48min).
The month with the least sunshine is February (Average sunshine: 4h and 0min).

[Resources]

Average sunshine days in December
Bienvenue, French Guiana

Average sunshine days in December - Bienvenue, French Guiana
  • Average sunshine days in December: 4.5 days

The month with the most sunshine days is October (16.3 days).
The month with the least sunshine days is May (1.8 days).

[Resources]

Average UV index in December
Bienvenue, French Guiana

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

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

[Resources]

Average cloud cover in December
Bienvenue, French Guiana

Average cloud cover in December - Bienvenue, French Guiana
  • Average cloud cover in December: 67

The month with the most cloud cover is February (Cloud cover 78).
The month with the least cloud cover is October (Cloud cover 46).

[Resources]

Average visibility in December
Bienvenue, French Guiana

Average visibility in December - Bienvenue, French Guiana
  • Average visibility in December: 6km

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

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location