December weather forecast
Mana, French Guiana

December brings a cooler weather pattern to Mana, with temperatures falling to 30.2°C (86.4°F), marking a distinct transition from November. Despite the drop in temperature, Mana remains humid with an average relative humidity of 83%. As the year comes to a close, the city demonstrates a notable shift towards cooler and more bearable weather conditions. The drop in temperatures opens up the opportunity for enjoying outdoor activities and the city's stunning scenery. Despite the year-end, weather patterns remain relatively stable, allowing residents and visitors to plan their activities with ease.

Temperature

The arrival of December brings an average high-temperature of a still hot 30.2°C (86.4°F), nearly identical to November's 32.4°C (90.3°F). Mana's December nights cool down to an average low-temperature of 22.7°C (72.9°F).

Heat index

Throughout December, the heat index is evaluated at a fiery hot 39°C (102.2°F). Undertake additional safety actions, risk of heat cramps and heat exhaustion is significant. Persistent activity may induce heatstroke.
Heat index specifics point out values are for conditions of shade and a slight breeze. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is an amalgamation of air temperature and humidity to express the equivalent perceived temperature. The impact of weather is personal, differing among a variety of people based on differences in body mass, height, and the level of physical exertion. Be mindful that being in direct sunlight might mean feeling hotter, with the heat index rising by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Young individuals usually face more risks than adults due to their lower sweat production. Their large skin surface area relative to their tiny bodies and high heat production from their activities adds to their risk.
Perspiring is a crucial mechanism for the human body, allowing it to release excessive warmth through evaporating sweat. Increased relative humidity slows down evaporation, thereby decreasing the rate of heat removal from the body, culminating in a sensation of overheating. Excessive heat that's not properly managed leads to increased body temperatures and resultant health issues.

Humidity

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 Mana, during the entire year, the rain falls for 253 days and collects up to 878mm (34.57") of precipitation.

Sea temperature

In Mana, in December, the average water temperature is 27.7°C (81.9°F).
Note: Temperatures between 25°C (77°F) and 29°C (84.2°F) are ideal for swimming, diving, and similar water activities, ensuring pleasure and comfort for extended periods without feeling uneasy.

Daylight

December has the shortest days of the year in Mana, with an average of 11h and 48min of daylight.
On the first day of the month, sunrise is at 06:29 and sunset at 18:18. On the last day of December, in Mana, sunrise is at 06:44 and sunset at 18:32 -03.

Sunshine

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

UV index

January through June and December, with an average maximum UV index of 6, are months with the lowest UV index. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for the average person.
Note: During December, 6 as the daily maximum UV index converts into the following advice:
Inhibit overexposure. Warding off sun damage is of utmost importance. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Warning! Reflective surfaces like sand and water amplify the Sun's UV radiation.