December weather forecast
Parcours Noir, French Guiana

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

Temperature

A subtle shift in Parcours Noir's weather is observed as November turns into December, with the average high temperature reducing from a tropical 33°C (91.4°F) to a warm 29.8°C (85.6°F). Parcours Noir experiences a consistent average temperature of 22°C (71.6°F) throughout the nights in December.

Heat index

The heat index for December is estimated at a fiery hot 39°C (102.2°F). Heightened precautions are necessary, heat cramps and heat exhaustion are potential risks. Continuous activity could lead to heatstroke.
Bear in mind that the heat index values are determined for shaded areas and light breezes. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', offers an insight into how hot it feels when we factor in moisture content. Depending on the activity and the individual's heat perception, which may vary due to factors including wind, clothing, and metabolic variations, this effect remains subjective. Do note, being directly under sun rays can amplify the heat you feel, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Children frequently underestimate the importance of resting and drinking fluids. Thirst is a symptom of advanced dehydration - hence the need to hydrate regularly, especially during protracted physical exercises.
To offset high temperatures, the human body releases sweat which, upon evaporation, cools it down. Augmented relative humidity impedes typical body cooling mechanisms by lowering the evaporation rate, resulting in decreased body cooling and an amplified perception of heat. When body temperature rises due to an imbalance in heat gain, there's a potential for dehydration and overheating.

Humidity

The average relative humidity in December is 86%.

Rainfall

In Parcours Noir, during December, the rain falls for 25.1 days and regularly aggregates up to 146mm (5.75") of precipitation. Throughout the year, there are 270.6 rainfall days, and 1131mm (44.53") of precipitation is accumulated.

Daylight

With an average of 11h and 54min of daylight, December has the shortest days of the year in Parcours Noir.
On the first day of the month, sunrise is at 06:19 and sunset at 18:15. On the last day of December, sunrise is at 06:33 and sunset at 18:29 -03.

Sunshine

In December, the average sunshine in Parcours Noir 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 in Parcours Noir. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: The maximum UV index of 6 during December leads to these instructions:
Take precautions against overexposure. Protection against sun damage is needed. The time between 10 a.m. and 4 p.m. is when UV radiation is at its peak. Limit exposure to direct sunlight during these hours. Experience reduced UV exposure by about half when donning a wide-brim hat.