December weather forecastIpanema, Brazil

December

Weather in December

December, the first month of the summer in Ipanema, is still a warm month, with an average temperature fluctuating between 27.2°C (81°F) and 23.4°C (74.1°F).

Temperature

December is marked by an average high-temperature of a still moderately hot 27.2°C (81°F), almost identical to the preceding month. Ipanema encounters a small divergence from daytime high temperatures, averaging a low-temperature of 23.4°C (74.1°F) during December nights.

Heat index

December's average heat index is estimated at a hot 30°C (86°F). When exposure and activity are sustained, they could induce fatigue, with a chance of heat cramps.
Evaluating the heat index requires understanding its values in the shade and with gentle winds. Exposing to direct sunshine may enhance heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', determines the feeling of heat when you account for the relative humidity. The impact of weather is individual, with diverse individuals experiencing it differently due to variations in body mass, height, and activity levels. With direct sunlight, be aware that it might enhance the heat sensation, raising the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. In general, younger individuals are at greater risk than adults because they tend to sweat less. Also, having a larger skin surface to body size ratio and greater heat production due to their active behavior contribute to this danger.

Humidity

The months with the highest humidity are November and December, with an average relative humidity of 82%.

Rainfall

In Ipanema, Brazil, during December, the rain falls for 14.5 days and regularly aggregates up to 70mm (2.76") of precipitation. In Ipanema, during the entire year, the rain falls for 160.8 days and collects up to 655mm (25.79") of precipitation.

Daylight

With an average of 13h and 30min of daylight, December has the longest days of the year.
On the first day of the month, sunrise is at 04:58 and sunset at 18:25. On the last day of December, sunrise is at 05:10 and sunset at 18:41 -03.

Sunshine

In December, the average sunshine is 8.7h.

UV index

The months with the highest UV index are January, February and December, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: A maximum daily UV index of 7 during December morphs into the following directions:
Follow precautions and abide by sun safety rules. Deterrence of sunburn is imperative. Seek shade and limit direct Sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its peak, but be aware that not all shade structures provide complete sun protection. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.

Updated: Aug 26, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

The average high-temperature, in December, in Ipanema, is 27.2°C (81°F), while the average low-temperature is 23.4°C (74.1°F). In December, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which factors the actual air temperature with the relative humidity, is estimated at 30°C (86°F).

November and December, with an average relative humidity of 82%, are most humid months.

In December, the average relative humidity is 82%.

In Ipanema, in December, during 14.5 rainfall days, 70mm (2.76") of precipitation is typically accumulated.

The month with the longest days is December, with an average of 13h and 30min of daylight.

In Ipanema, the average day length in December is 13h and 31min.

On the first day of December, sunrise is at 04:58 and sunset at 18:25. On the last day of the month, sunrise is at 05:10 and sunset at 18:41 -03.

In Ipanema, the average sunshine duration in December is 8.7h.

January, February and December, with an average maximum UV index of 7, are months with the highest UV index in Ipanema.

In Ipanema, the average daily maximum UV index in December is 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to Sun's UV rays.

Today

Tomorrow

Long-term

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

Nov

December

Jan

Average high temperature

25.5°C

27.2°C

28.6°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

14.9km/h

13.3km/h

12.7km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average daylight

Average sunshine

Average sunshine days

10.1

15.5

Average UV index

Average cloud cover

Average visibility

Average temperature in December
Ipanema, Brazil

Average high temperature in December: 27.2°C

The warmest month (with the highest average high temperature) is February (29.1°C).
The month with the lowest average high temperature is July (23.7°C).

Average low temperature in December: 23.4°C

The month with the highest average low temperature is January (24.3°C).
The coldest month (with the lowest average low temperature) is August (19°C).

Average pressure in December
Ipanema, Brazil

Average pressure in December: 1011.8mbar

The month with the highest atmospheric pressure is July (1020.4mbar).
The month with the lowest atmospheric pressure is December (1011.8mbar).

Average wind speed in December
Ipanema, Brazil

Average wind speed in December: 11.8km/h

The windiest month (with the highest average wind speed) is August (14.4km/h).
The calmest month (with the lowest average wind speed) is March (10.8km/h).

Average humidity in December
Ipanema, Brazil

Average humidity in December: 82%

The months with the highest relative humidity are November and December (82%).
The month with the lowest relative humidity is August (77%).

Average rainfall in December
Ipanema, Brazil

Average rainfall in December: 70mm

The wettest month (with the highest rainfall) is November (99mm).
The driest month (with the least rainfall) is June (34mm).

Average rainfall days in December
Ipanema, Brazil

Average rainfall days in December: 14.5 days

The month with the highest number of rainy days is November (18.5 days).
The month with the least rainy days is February (10.4 days).

Average daylight in December /
Average sunshine in December
Ipanema, Brazil

Average daylight in December: 13h and 30min

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 42min).

Average sunshine in December: 8h and 42min

The month with the most sunshine is February (Average sunshine: 9h and 0min).
The month with the least sunshine is October (Average sunshine: 7h and 42min).

Average sunshine days in December
Ipanema, Brazil

Average sunshine days in December: 15 days

The month with the most sunshine days is August (18.3 days).
The month with the least sunshine days is November (10.1 days).

Average UV index in December
Ipanema, Brazil

Average UV index in December: 7

The months with the highest UV index are January, February and December (UV index 7).
The month with the lowest UV index is September (UV index 5).

Average cloud cover in December
Ipanema, Brazil

Average cloud cover in December: 37

The month with the most cloud cover is November (Cloud cover 44).
The month with the least cloud cover is February (Cloud cover 27).

Average visibility in December
Ipanema, Brazil

Average visibility in December: 10km

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October and December (10km).
The month with the lowest visibility is November (9km).