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 commencement of December introduces an average high-temperature of a still moderately hot 28.9°C (84°F), closely mirroring the preceding month. In December, Marechal Hermes's temperature tends to fall to an average low of 21.8°C (71.2°F) during the night.Heat index
The heat index in December is evaluated at a torrid 35°C (95°F). Take more caution, heat exhaustion and heat cramps may occur. Long-lasting activity may cause heatstroke.It is essential to grasp that the heat index's numbers are for shade and light wind settings. The heat index can potentially augment by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'feels like' or 'felt air temperature', gives a temperature feeling by integrating air temperature and humidity. The individual's impression of temperature can be affected by numerous factors such as metabolic variations, physical exertion, and attire. The sun, when shining directly, can have a significant impact on the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Children often overlook the need for breaks and fluid intake. Thirst is a late-stage sign of dehydration - hence, it is necessary to stay hydrated, especially during extended periods of physical activities.
The body's inherent cooling system operates through perspiration, wherein evaporating sweat offsets excessive heat. A higher relative humidity affects normal body cooling by reducing the evaporation rate, subsequently lowering the rate at which the body cools and increasing the perception of heat. Overheating and dehydration threats arise when heat gain goes beyond what the body can comfortably shed.
Humidity
In December, the average relative humidity is 81%.Rainfall
In Marechal Hermes, in December, during 23.8 rainfall days, 84mm (3.31") of precipitation is typically accumulated. Throughout the year, there are 205.4 rainfall days, and 637mm (25.08") of precipitation is accumulated.Daylight
The month with the longest days is December, with an average of 13h and 30min of daylight.On the first day of the month, sunrise is at 04:59 and sunset at 18:25. On the last day of December, sunrise is at 05:11 and sunset at 18:42 -03.
Sunshine
The average sunshine in December is 7.8h.UV index
The months with the highest UV index are January and December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for the average person.Note: In December, the maximum UV index of 7 suggests these recommendations:
Exercise precautions and adapt sun safety practices. Defence against skin and eye affliction is paramount. Limit direct sun exposure especially between 10 a.m. and 4 p.m., when UV radiation is at its peak. However, keep in mind that shade structures may not provide full sun protection. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is December?
What is the average humidity in December in Marechal Hermes?
How many days does it rain in December?
When are the longest days?
How many hours of daylight does Marechal Hermes have in December?
When is the sunrise / sunset in December?
How long on average sun shines in December?
What is the month with the highest UV index?
What is the UV index intensity in December?
Average temperature in December
Marechal Hermes, Brazil
- Average high temperature in December: 28.9°C
The warmest month (with the highest average high temperature) is February (30.1°C).
The month with the lowest average high temperature is July (24.1°C).
- Average low temperature in December: 21.8°C
The month with the highest average low temperature is January (22.3°C).
The coldest month (with the lowest average low temperature) is August (16.9°C).
Average pressure in December
Marechal Hermes, Brazil
- Average pressure in December: 1012mbar
The month with the highest atmospheric pressure is July (1020.5mbar).
The month with the lowest atmospheric pressure is December (1012mbar).
Average wind speed in December
Marechal Hermes, Brazil
- Average wind speed in December: 7.3km/h
The windiest month (with the highest average wind speed) is September (8.6km/h).
The calmest month (with the lowest average wind speed) is March (6.7km/h).
Average humidity in December
Marechal Hermes, Brazil
- Average humidity in December: 81%
The months with the highest relative humidity are March, April, May and November (82%).
The month with the lowest relative humidity is August (77%).
Average rainfall in December
Marechal Hermes, Brazil
- Average rainfall in December: 84mm
The wettest month (with the highest rainfall) is January (94mm).
The driest month (with the least rainfall) is June (24mm).
Average rainfall days in December
Marechal Hermes, Brazil
- Average rainfall days in December: 23.8 days
The month with the highest number of rainy days is December (23.8 days).
The month with the least rainy days is August (10.2 days).
Average daylight in December /
Average sunshine in December
Marechal Hermes, Brazil
- Average daylight in December: 13h and 3min
The month with the longest days is December (Average daylight: 13h and 30min).
The month with the shortest days is June (Average daylight: 10h and 48min).
- Average sunshine in December: 7h and 5min
The month with the most sunshine is February (Average sunshine: 8h and 42min).
The month with the least sunshine is November (Average sunshine: 7h and 12min).
Average sunshine days in December
Marechal Hermes, Brazil
- Average sunshine days in December: 4.9 days
The month with the most sunshine days is August (18.8 days).
The month with the least sunshine days is December (4.9 days).
Average UV index in December
Marechal Hermes, Brazil
- Average UV index in December: 7
The months with the highest UV index are January and December (UV index 7).
The months with the lowest UV index are April, May, July and September (UV index 5).
Average cloud cover in December
Marechal Hermes, Brazil
- Average cloud cover in December: 43
The month with the most cloud cover is November (Cloud cover 50).
The months with the least cloud cover are February, July and August (Cloud cover 31).
Average visibility in December
Marechal Hermes, Brazil
- Average visibility in December: 9km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
