Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
December
Weather in December
Temperature
The arrival of December is marked by a minor reduction in average high-temperature, sliding from a hot 33.9°C (93°F) in November to a still tropical 30.8°C (87.4°F). L'Observatoire sees an average low-temperature of 21.1°C (70°F) during December.Heat index
In December, the average heat index is estimated at a blisteringly hot 42°C (107.6°F). More preventive actions are needed, risk of heat exhaustion and heat cramps is significant. Prolonged activity may trigger heatstroke.Metrics for the heat index primarily focus on shaded spots and light wind conditions. Heat index values can rise by 15 Fahrenheit (8 Celsius) degrees when in direct sunlight.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is an indicator that blends the effects of temperature and humidity to depict perceived warmth. Elements of metabolic variation, physical activity, and clothing contribute to the effect of temperature on an individual. Should you be directly under the sun, anticipate a possible increase in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Kids often lack the knowledge about the necessity to take breaks and consume liquids. Thirst, as a late symptom of dehydration, necessitates the maintenance of hydration, particularly during enduring physical activities.
The human body keeps its cool primarily through perspiration, as this process enables sweat to evaporate, taking away the excess heat. Increased relative humidity interferes with body cooling by slowing the rate of evaporation, resulting in a slower body cooling rate and a heightened feeling of heat. As body temperatures escalate without effective heat release, one might face dehydration threats.
Humidity
The average relative humidity in December in L'Observatoire, French Guiana, is 86%.Rainfall
In L'Observatoire, in December, during 28 rainfall days, 90mm (3.54") of precipitation is typically accumulated. In L'Observatoire, French Guiana, during the entire year, the rain falls for 259.3 days and collects up to 898mm (35.35") of precipitation.Daylight
December has the shortest days of the year, with an average of 11h and 54min of daylight.On the first day of the month, sunrise is at 06:28 and sunset at 18:21. On the last day of December, sunrise is at 06:43 and sunset at 18:35 -03.
Sunshine
In L'Observatoire, the average sunshine in December is 6.2h.UV index
The month with the lowest UV index is December, with an average maximum UV index of 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: A typical high UV index of 5 in December suggests the following recommendations:
Act with care - The suggestion to avoid sunburn is emphasized. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Boost your sun resistance with garments that are densely woven yet spacious.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot does it get in L'Observatoire in December?
What is the average humidity in December in L'Observatoire?
How much does it rain in L'Observatoire in December?
What is the month with the shortest days in L'Observatoire?
What is the average length of the day in December in L'Observatoire?
When is the sunrise / sunset in December in L'Observatoire?
How many hours of sunshine does L'Observatoire have in December?
What is the month with the lowest UV index in L'Observatoire?
What is the UV index reading in December in L'Observatoire?
Average temperature in December
L'Observatoire, 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 (29.5°C).
- Average low temperature in December: 21.1°C
The month with the highest average low temperature is May (22.1°C).
The coldest month (with the lowest average low temperature) is January (20.6°C).
Average pressure in December
L'Observatoire, French Guiana
- Average pressure in December: 1010.7mbar
The months with the highest atmospheric pressure are June and July (1012.9mbar).
The month with the lowest atmospheric pressure is November (1009.3mbar).
Average wind speed in December
L'Observatoire, French Guiana
- Average wind speed in December: 5.3km/h
The windiest months (with the highest average wind speed) are March and November (5.5km/h).
The calmest month (with the lowest average wind speed) is July (4.4km/h).
Average humidity in December
L'Observatoire, French Guiana
- Average humidity in December: 86%
The month with the highest relative humidity is May (90%).
The month with the lowest relative humidity is October (73%).
Average rainfall in December
L'Observatoire, French Guiana
- Average rainfall in December: 90mm
The wettest month (with the highest rainfall) is May (169mm).
The driest month (with the least rainfall) is October (21mm).
Average rainfall days in December
L'Observatoire, French Guiana
- Average rainfall days in December: 28 days
The months with the highest number of rainy days are January and December (28 days).
The month with the least rainy days is September (10.3 days).
Average daylight in December /
Average sunshine in December
L'Observatoire, French Guiana
- Average daylight in December: 11h and 5min
The month with the longest days is June (Average daylight: 12h and 24min).
The month with the shortest days is December (Average daylight: 11h and 54min).
- Average sunshine in December: 6h and 1min
The month with the most sunshine is September (Average sunshine: 9h and 12min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).
Average sunshine days in December
L'Observatoire, French Guiana
- Average sunshine days in December: 1.9 days
The month with the most sunshine days is October (18.5 days).
The month with the least sunshine days is February (1.4 days).
Average UV index in December
L'Observatoire, French Guiana
- Average UV index in December: 5
The months with the highest UV index are July, August, September, October and November (UV index 7).
The month with the lowest UV index is December (UV index 5).
Average cloud cover in December
L'Observatoire, French Guiana
- Average cloud cover in December: 70
The month with the most cloud cover is February (Cloud cover 78).
The month with the least cloud cover is October (Cloud cover 46).
Average visibility in December
L'Observatoire, French Guiana
- Average visibility in December: 6km
The months with the highest visibility are August, September, October and November (7km).
The months with the lowest visibility are January, February, March, April, May, June, July and December (6km).
