December weather forecast
Siminiout, French Guiana

The first month of the winter, December, is also a moderately hot month in Siminiout, French Guiana, with an average temperature varying between 22°C (71.6°F) and 29.8°C (85.6°F).

Temperature

December brings a slight decrease in the average high-temperature, shifting from a hot 33°C (91.4°F) in November to a moderately hot 29.8°C (85.6°F). In the month of December, the nighttime temperature in Siminiout dips to a steady average of 22°C (71.6°F).

Heat index

For most parts of December, the heat index is appraised at a fiery hot 39°C (102.2°F). Undertake enhanced precautions, heat exhaustion and heat cramps are possible risks. Continuous activity could trigger heatstroke.
In the scope of the heat index, its values resonate with shade and light wind conditions. Direct exposure to sunshine could lead to a heat index increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', blends air temperature and moisture content to represent the felt temperature to humans. Additional elements including metabolic differences, the level of physical activity, and attire have a role in shaping the individual's temperature perception. It is noteworthy to mention that direct sunlight exposure can augment the felt temperature, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.
Perspiration is essential for the human body; it facilitates cooling through the process of sweat evaporation. 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. If the body retains more heat than it can expel, the increasing temperature can lead to heat-related conditions.

Humidity

In December, the average relative humidity in Siminiout, French Guiana, is 86%.

Rainfall

In Siminiout, French Guiana, in December, it is raining for 25.1 days, with typically 146mm (5.75") of accumulated precipitation. In Siminiout, during the entire year, the rain falls for 270.6 days and collects up to 1131mm (44.53") of precipitation.

Daylight

The month with the shortest days in Siminiout is December, with an average of 12h and 0min of daylight.
On the first day of the month, sunrise is at 06:21 and sunset at 18:19. On the last day of December, in Siminiout, sunrise is at 06:35 and sunset at 18:33 -03.

Sunshine

The average sunshine in December in Siminiout is 5.9h.

UV index

The months with the lowest UV index in Siminiout, French Guiana, are January through July, November and December, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for average individuals.
Note: In December, the maximum UV index of 6 suggests this advice:
Uphold preventive measures and conform to sun safety guidelines. Defending against skin and eye harm is crucial. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. Stay sun-safe with clothing that is both closely woven and worn loosely.