December weather forecastSão Jerônimo da Serra, Brazil

December

Weather in December

December, the first month of the summer in São Jerônimo da Serra, is still a warm month, with temperature in the range of an average high of 28.5°C (83.3°F) and an average low of 19.2°C (66.6°F).

Temperature

With the onset of December, the average high-temperature of a still warm 28.5°C (83.3°F) mirrors that of November. The average temperature in São Jerônimo da Serra drops to a comfortable 19.2°C (66.6°F) during the night in the month of December.

Heat index

December's heat index is appraised at a tropical 34°C (93.2°F). Ensure additional precautions, heat exhaustion and heat cramps may be expected. Heatstroke could occur from sustained activity.
Evaluating the heat index requires understanding its values in the shade and with gentle winds. Heat index values might soar by up to 15 Fahrenheit (8 Celsius) degrees with exposure to direct sunshine.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', gives a temperature feeling by integrating air temperature and humidity. Elements such as metabolic variations, pregnancy, and physical exertion can shape one's weather perception. Direct sun exposure is noteworthy in its ability to escalate the felt temperature, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are particularly relevant to children. Young ones often underestimate the need for rest and rehydration. Thirst appears late in dehydration - hence, it is important to keep hydrated, particularly during prolonged physical activities.

Humidity

In São Jerônimo da Serra, the average relative humidity in December is 82%.

Rainfall

In São Jerônimo da Serra, during December, the rain falls for 22.3 days and regularly aggregates up to 109mm (4.29") of precipitation. In São Jerônimo da Serra, Brazil, during the entire year, the rain falls for 185.2 days and collects up to 1015mm (39.96") of precipitation.

Daylight

With an average of 13h and 36min of daylight, December has the longest days of the year.
On the first day of December, sunrise is at 05:27 and sunset at 18:57. On the last day of the month, sunrise is at 05:39 and sunset at 19:13 -03.

Sunshine

The average sunshine in December is 7.8h.

UV index

January through March, August through December, with an average maximum UV index of 6, are months with the highest UV index in São Jerônimo da Serra. A UV Index of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV rays for the average person.
Note: In December, a daily maximum UV index of 6 leads to the following instructions:
Stay clear of intense sun exposure. Solar protection is of utmost significance. Avoid direct exposure to the Sun between 10 a.m. and 4 p.m., the peak period for UV radiation, noting that objects like parasols or canopies might not offer complete sun protection. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.

Updated: Feb 2, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

During December, São Jerônimo da Serra experiences an average high-temperature of 28.5°C (83.3°F) and a low-temperature of 19.2°C (66.6°F). The average heat index (a.k.a. 'real feel', 'apparent temperature'), which factors the actual air temperature with the relative humidity, in December is appraised at 34°C (93.2°F).

In December, the average relative humidity is 82%.

In São Jerônimo da Serra, Brazil, in December, it is raining for 22.3 days, with typically 109mm (4.29") of accumulated precipitation.

With an average of 13h and 36min of daylight, December has the longest days of the year in São Jerônimo da Serra, Brazil.

The average day length in December is 13h and 34min.

In December, on the first day of the month, sunrise is at 05:27 and sunset at 18:57. On the last day of the month, in São Jerônimo da Serra, Brazil, sunrise is at 05:39 and sunset at 19:13 -03.

The average sunshine duration in December in São Jerônimo da Serra is 7.8h.

January through March, August through December, with an average maximum UV index of 6, are months with the highest UV index in São Jerônimo da Serra, Brazil.

In December, the average daily maximum UV index in São Jerônimo da Serra is 6. A UV Index of 6 to 7 symbolizes a high health risk from unsafe 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

28.5°C

27.8°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

11.2km/h

9.8km/h

9.3km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average daylight

Average sunshine

Average sunshine days

12.4

7.9

6.4

Average UV index

Average cloud cover

Average visibility

Average temperature in December
São Jerônimo da Serra, Brazil

Average high temperature in December: 28.5°C

The warmest month (with the highest average high temperature) is October (28.8°C).
The month with the lowest average high temperature is June (21.7°C).

Average low temperature in December: 19.2°C

The month with the highest average low temperature is February (19.3°C).
The coldest month (with the lowest average low temperature) is July (12.8°C).

Average pressure in December
São Jerônimo da Serra, Brazil

Average pressure in December: 1010.6mbar

The month with the highest atmospheric pressure is July (1019mbar).
The month with the lowest atmospheric pressure is December (1010.6mbar).

Average wind speed in December
São Jerônimo da Serra, Brazil

Average wind speed in December: 9km/h

The windiest months (with the highest average wind speed) are August and September (11.2km/h).
The calmest month (with the lowest average wind speed) is February (8.5km/h).

Average humidity in December
São Jerônimo da Serra, Brazil

Average humidity in December: 82%

The months with the highest relative humidity are January and June (87%).
The month with the lowest relative humidity is September (67%).

Average rainfall in December
São Jerônimo da Serra, Brazil

Average rainfall in December: 109mm

The wettest month (with the highest rainfall) is January (137mm).
The driest month (with the least rainfall) is August (49mm).

Average rainfall days in December
São Jerônimo da Serra, Brazil

Average rainfall days in December: 22.3 days

The month with the highest number of rainy days is January (23.2 days).
The month with the least rainy days is August (8 days).

Average daylight in December /
Average sunshine in December
São Jerônimo da Serra, Brazil

Average daylight in December: 13h and 36min

The month with the longest days is December (Average daylight: 13h and 36min).
The month with the shortest days is June (Average daylight: 10h and 42min).

Average sunshine in December: 7h and 48min

The month with the most sunshine is August (Average sunshine: 9h and 12min).
The month with the least sunshine is January (Average sunshine: 7h and 12min).

Average sunshine days in December
São Jerônimo da Serra, Brazil

Average sunshine days in December: 7.9 days

The month with the most sunshine days is August (22.1 days).
The month with the least sunshine days is February (4.9 days).

Average UV index in December
São Jerônimo da Serra, Brazil

Average UV index in December: 6

The months with the highest UV index are January, February, March, August, September, October, November and December (UV index 6).
The month with the lowest UV index is May (UV index 4).