December weather forecast
Certitude, French Guiana

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

Temperature

Certitude, French Guiana, observes a small decrease in the average high-temperature with the arrival of December, falling from November's hot 34°C (93.2°F) to a still tropical 30.8°C (87.4°F). Nighttime temperatures consistently average a pleasant 20.9°C (69.6°F) during December.

Heat index

The heat index value during December is estimated at a blistering 42°C (107.6°F). Implement heightened safety measures - risk of heat exhaustion and heat cramps is increased. Prolonged activity may result in heatstroke.
Consider that heat index readings are for situations in the shade and light wind. The heat index could see an increase by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is an amalgamation of air temperature and humidity to express the equivalent perceived temperature. An individual's perception of weather can be affected by a variety of elements including metabolic differences, being pregnant, and their level of physical exertion. You should know that direct sun exposure can heighten weather effects, potentially elevating the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Juveniles often do not understand the need to recuperate and rehydrate. Thirst is a delayed symptom of dehydration - hence, it is vital to maintain hydration, particularly during ongoing physical activities.
Evaporating sweat, an outcome of perspiration, is key in assisting the human body to moderate its temperature. In conditions of both high temperature and humidity (a high heat index), sweating is limited and the perception of heat is enhanced. Inadequate heat shedding in the face of rising body temperatures hints at potential dehydration risks.

Humidity

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

Rainfall

In Certitude, during December, the rain falls for 26.2 days and regularly aggregates up to 112mm (4.41") of precipitation. In Certitude, during the entire year, the rain falls for 265.5 days and collects up to 1078mm (42.44") of precipitation.

Daylight

With an average of 11h and 54min of daylight, December has the shortest days of the year.
On the first day of December in Certitude, sunrise is at 06:24 and sunset at 18:19. On the last day of the month, sunrise is at 06:39 and sunset at 18:33 -03.

Sunshine

In Certitude, the average sunshine in December is 5.6h.

UV index

January, March and December, with an average maximum UV index of 5, are months with the lowest UV index. A UV Index estimate of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for average individuals.
Note: A daily maximum UV index of 5 in December translates into the following instructions:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.