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
Weather in December
Temperature
The commencement of December introduces an average high-temperature of a still moderately hot 28.3°C (82.9°F), closely mirroring the preceding month. During December, the temperature in Petrópolis tends to dip to an average of 20.9°C (69.6°F) at night.Heat index
December's mean heat index is calculated to be a hot 34°C (93.2°F). Adopt extra preventive measures, the occurrence of heat cramps and heat exhaustion is likely. Heatstroke may follow extended activity.Realize that the values for the heat index are set for shaded places and light winds. The heat index could see an increase by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'real feel' or 'feels like', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. Factors such as metabolic variation, pregnancy, and physical activity play a role in one's impression of weather. When you're directly under the sun's rays, remember that the heat index may surge by 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Typically, children face more danger than adults as they usually perspire less. Their larger skin surface relative to their small bodies and increased heat output from their activities enhance their risk.
Humidity
The average relative humidity in December in Petrópolis is 84%.Rainfall
In Petrópolis, during December, the rain falls for 26.8 days and regularly aggregates up to 141mm (5.55") of precipitation. Throughout the year, there are 228.9 rainfall days, and 1079mm (42.48") of precipitation is accumulated.Daylight
The month with the longest days in Petrópolis is December, with an average of 13h and 30min of daylight.On the first day of December in Petrópolis, sunrise is at 04:59 and sunset at 18:24. On the last day of the month, sunrise is at 05:11 and sunset at 18:40 -03.
Sunshine
In December, the average sunshine in Petrópolis is 7.7h.UV index
January through March, August, October through December, with an average maximum UV index of 6, are months with the highest UV index. A UV Index value of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: A daily maximum UV index of 6 in December translates into the following instructions:
Deflect overexposure. Sun protection is a necessity. The Sun's UV radiation is most potent between the hours of 10 a.m. and 4 p.m. Try to avoid direct sunlight during this time. To cut down UV radiation exposure by about half, sport a wide-brim hat.
Frequently asked questions
How hot does it get in Petrópolis in December?
What is the average humidity in December in Petrópolis?
How many days does it rain in December in Petrópolis?
When are the longest days in Petrópolis?
What is the average length of the day in December in Petrópolis?
What time are sunrise and sunset in December in Petrópolis?
How many hours of sunshine does Petrópolis have in December?
What is the month with the highest UV index in Petrópolis?
How high is the UV index in December in Petrópolis?
Average temperature in December
Petrópolis, Brazil
- Average high temperature in December: 28.3°C
The warmest month (with the highest average high temperature) is January (29.2°C).
The month with the lowest average high temperature is June (23.4°C).
- Average low temperature in December: 20.9°C
The month with the highest average low temperature is January (21.3°C).
The coldest month (with the lowest average low temperature) is June (16°C).
Average pressure in December
Petrópolis, Brazil
- Average pressure in December: 1012mbar
The month with the highest atmospheric pressure is July (1020.6mbar).
The month with the lowest atmospheric pressure is December (1012mbar).
Average wind speed in December
Petrópolis, Brazil
- Average wind speed in December: 6.9km/h
The windiest month (with the highest average wind speed) is September (8.1km/h).
The calmest month (with the lowest average wind speed) is March (6.2km/h).
Average humidity in December
Petrópolis, Brazil
- Average humidity in December: 84%
The months with the highest relative humidity are March, April and November (85%).
The month with the lowest relative humidity is August (78%).
Average rainfall in December
Petrópolis, Brazil
- Average rainfall in December: 141mm
The wettest months (with the highest rainfall) are January and November (155mm).
The driest month (with the least rainfall) is July (31mm).
Average rainfall days in December
Petrópolis, Brazil
- Average rainfall days in December: 26.8 days
The month with the highest number of rainy days is December (26.8 days).
The month with the least rainy days is August (11.3 days).
Average daylight in December /
Average sunshine in December
Petrópolis, 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 4min
The month with the most sunshine is February (Average sunshine: 8h and 24min).
The months with the least sunshine are October and November (Average sunshine: 7h and 18min).
Average sunshine days in December
Petrópolis, Brazil
- Average sunshine days in December: 2.2 days
The month with the most sunshine days is August (17.2 days).
The month with the least sunshine days is December (2.2 days).
Average UV index in December
Petrópolis, Brazil
- Average UV index in December: 6
The months with the highest UV index are January, February, March, August, October, November and December (UV index 6).
The months with the lowest UV index are April, May, June, July and September (UV index 5).
Average cloud cover in December
Petrópolis, Brazil
- Average cloud cover in December: 46
The month with the most cloud cover is November (Cloud cover 52).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in December
Petrópolis, Brazil
- Average visibility in December: 8km
The months with the highest visibility are January, February, May, June, July, August, September and October (9km).
The months with the lowest visibility are March, April, November and December (8km).
Petrópolis, Brazil
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