December weather forecastGrigel, French Guiana

December

Weather in December

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

Temperature

December's onset introduces a mild reduction in the average high-temperature, from a tropical 34°C (93.2°F) in November to a still hot 30.8°C (87.4°F). December brings with it a nighttime average temperature of 20.9°C (69.6°F) in Grigel.

Heat index

December's average heat index is computed to be an extremely hot 42°C (107.6°F). Incorporate special precautions, risk of heat exhaustion and heat cramps is substantial. Sustained activity could cause heatstroke.
Take note of the fact that heat index values are based on shaded circumstances with light airflows. Direct sunlight might cause an increase of up to 15 Fahrenheit (8 Celsius) degrees in the heat index.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is a value derived by merging air temperature with the humidity to convey how the climate feels. This effect is personal, influenced by the individual's physical activity and heat sensitivity, shaped by factors including wind, attire, and metabolic variations. Under direct sun rays, the felt temperature might be heightened, with the heat index increasing by 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Younglings are generally more in peril than adults due to their reduced perspiration. Coupled with a larger skin surface relative to their tiny bodies and greater heat production because of their activity, they become more at risk.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. In the presence of elevated relative humidity, the evaporation rate decreases. This reduction leads to increased body heat retention compared to conditions of dry air. As the body gains more heat than it can dissipate, there's a risk of increasing temperatures and resultant overheating.

Humidity

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

Rainfall

In Grigel, in December, it is raining for 26.2 days, with typically 112mm (4.41") of accumulated precipitation. Throughout the year, there are 265.5 rainfall days, and 1078mm (42.44") of precipitation is accumulated.

Daylight

With an average of 11h and 54min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 06:25 and sunset at 18:22. On the last day of December, in Grigel, sunrise is at 06:39 and sunset at 18:35 -03.

Sunshine

In December, the average sunshine 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 of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: In December, an average UV index of 5 transforms into the following instructions:
Make use of precautions - Shielding skin and eyes from injury is a requirement. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.

Updated: Jan 31, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

In Grigel, 30.8°C (87.4°F) is the average high-temperature and 20.9°C (69.6°F) is the average low-temperature during December. In December, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which represents the influence of relative humidity on air temperature, is computed to be 42°C (107.6°F).

The average relative humidity in December in Grigel is 85%.

In Grigel, French Guiana, in December, during 26.2 rainfall days, 112mm (4.41") of precipitation is typically accumulated.

The month with the shortest days is December, with an average of 11h and 54min of daylight.

In December, the average day length is 11h and 56min.

On the first day of December in Grigel, sunrise is at 06:25 and sunset at 18:22. On the last day of the month, sunrise is at 06:39 and sunset at 18:35 -03.

In Grigel, French Guiana, the average sunshine duration in December is 5.6h.

January, March and December, with an average maximum UV index of 5, are months with the lowest UV index.

In December, the average daily maximum UV index in Grigel is 5. A UV Index reading of 3 to 5 represents a moderate vulnerability from exposure to the Sun's UV radiation.

Today

Tomorrow

Long-term

Year J F M A M J J A S O N December

Nov

December

Jan

Average high temperature

34°C

30.8°C

29.7°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

5.7km/h

5.6km/h

5.5km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average daylight

Average sunshine

Average sunshine days

12.5

3.7

2.3

Average UV index

Average cloud cover

Average visibility

Average temperature in December
Grigel, French Guiana

Average high temperature in December: 30.8°C

The warmest month (with the highest average high temperature) is October (34.9°C).
The month with the lowest average high temperature is February (29.3°C).

Average low temperature in December: 20.9°C

The month with the highest average low temperature is May (21.9°C).
The coldest months (with the lowest average low temperature) are August and September (20.5°C).

Average pressure in December
Grigel, French Guiana

Average pressure in December: 1010.7mbar

The months with the highest atmospheric pressure are June and July (1013mbar).
The month with the lowest atmospheric pressure is November (1009.4mbar).

Average wind speed in December
Grigel, French Guiana

Average wind speed in December: 5.1km/h

The windiest months (with the highest average wind speed) are February, March and November (5.3km/h).
The calmest month (with the lowest average wind speed) is July (4.2km/h).

Average humidity in December
Grigel, French Guiana

Average humidity in December: 85%

The month with the highest relative humidity is May (90%).
The month with the lowest relative humidity is October (72%).

Average rainfall in December
Grigel, French Guiana

Average rainfall in December: 112mm

The wettest month (with the highest rainfall) is May (192mm).
The driest month (with the least rainfall) is October (21mm).

Average rainfall days in December
Grigel, French Guiana

Average rainfall days in December: 26.2 days

The months with the highest number of rainy days are January and March (26.8 days).
The month with the least rainy days is October (10.4 days).

Average daylight in December /
Average sunshine in December
Grigel, French Guiana

Average daylight in December: 11h and 54min

The month with the longest days is June (Average daylight: 12h and 18min).
The month with the shortest days is December (Average daylight: 11h and 54min).

Average sunshine in December: 5h and 36min

The months with the most sunshine are September and October (Average sunshine: 8h and 48min).
The month with the least sunshine is February (Average sunshine: 4h and 0min).

Average sunshine days in December
Grigel, French Guiana

Average sunshine days in December: 3.7 days

The month with the most sunshine days is October (17.3 days).
The month with the least sunshine days is February (1.8 days).

Average UV index in December
Grigel, French Guiana

Average UV index in December: 5

The months with the highest UV index are August, September, October and November (UV index 7).
The months with the lowest UV index are January, March and December (UV index 5).