December weather forecast
Bernardin, French Guiana

The first month of the winter, December, is also a hot month in Bernardin, French Guiana, with an average temperature ranging between max 30.8°C (87.4°F) and min 20.9°C (69.6°F).

Temperature

December reveals a small adjustment in temperature, transitioning from an average high of 34°C (93.2°F) in November to a still tropical 30.8°C (87.4°F). Throughout December, Bernardin records an average temperature of 20.9°C (69.6°F) at night.

Heat index

The heat index value for December is estimated at a blistering 42°C (107.6°F). Exercise more precautions, heat cramps and heat exhaustion are potential risks. Continuous activity could precipitate heatstroke.
Be aware that heat index ratings are designed for shaded locations and minor breezes. The heat index could see an increase by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. The individual's temperature perception can be influenced by numerous factors such as metabolic variations, physical activity, and clothing. Awareness is key; direct sunlight can enhance the weather's impact, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
In the face of high temperatures, the human body's reflex is to perspire, leveraging sweat evaporation for cooling. In situations of high air temperature combined with high humidity (significant heat index), the body's ability to perspire is reduced, heightening the sense of warmth. The body faces dehydration threats when its cooling efforts are outpaced by excessive heat gain.

Humidity

In Bernardin, the average relative humidity in December is 85%.

Rainfall

In Bernardin, during December, the rain falls for 26.2 days and regularly aggregates up to 112mm (4.41") of precipitation. Throughout the year, there are 265.5 rainfall days, and 1078mm (42.44") of precipitation is accumulated.

Daylight

December has the shortest days of the year, with an average of 11h and 54min of daylight.
On the first day of December in Bernardin, sunrise is at 06:26 and sunset at 18:21. On the last day of the month, sunrise is at 06:40 and sunset at 18:35 -03.

Sunshine

The average sunshine in December in Bernardin is 5.6h.

UV index

The months with the lowest UV index in Bernardin are January, March and December, with an average maximum UV index of 5. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the average person.
Note: In December, an average UV index of 5 transforms into the following instructions:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. The solar radiation around mid-day is intense; avoid the Sun and stay safe. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.