December weather forecast
Rivonia, South Africa

December

Weather in December

The first month of the summer, December, is also a moderately hot month in Rivonia, South Africa, with an average temperature varying between 16.3°C (61.3°F) and 27.5°C (81.5°F).

Temperature

In Rivonia, December is the month with the highest recorded average temperatures, measuring a high of 27.5°C (81.5°F) and a low of 16.3°C (61.3°F).

Heat index

December's mean heat index is evaluated at 29°C (84.2°F). Continued exposure and engagement in activity might trigger tiredness and subsequently heat cramps.
Heat index evaluations are typically in the context of light winds and shaded environments. If exposed to direct sunlight, the heat index could climb by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', embodies the combination of air temperature and moisture content to illustrate perceived heat. Elements such as metabolic variations, being pregnant, and physical activity can impact one's weather perception. With the sun shining directly, it's crucial to understand that it can increase the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Kids frequently fail to realize the necessity for resting and hydrating. Thirst is an advanced indication of dehydration - hence, maintaining hydration, especially during extended physical activities, becomes essential.

Humidity

The average relative humidity in December is 60%.

Rainfall

In Rivonia, in December, it is raining for 10.3 days, with typically 46mm (1.81") of accumulated precipitation. In Rivonia, during the entire year, the rain falls for 77.6 days and collects up to 262mm (10.31") of precipitation.

Daylight

With an average of 13h and 42min of daylight, December has the longest days of the year.
On the first day of December, sunrise is at 05:07 and sunset at 18:46. On the last day of the month, sunrise is at 05:18 and sunset at 19:03 SAST.

Sunshine

The average sunshine in December is 11.3h.

UV index

In Rivonia, the average daily maximum UV index in December is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for average individuals.
Note: In December, the maximum UV index of 5 transforms into these recommendations:
Act with care - Obligation to protect against skin and eye damage is highlighted. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.

Frequently asked questions

What are the warmest months in Rivonia?
With average high temperatures of 27.5°C (81.5°F) and lows of 16.3°C (61.3°F), December is the warmest month.
What is the usual temperature for Rivonia in December?
December temperatures vary between a high-temperature of 27.5°C (81.5°F) and a low-temperature of 16.3°C (61.3°F). In December, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which combines air temperature and relative humidity, is evaluated at 29°C (84.2°F).
What is the average humidity in December?
The average relative humidity in December is 60%.
How much does it rain in December?
In December, the rain falls for 10.3 days. Throughout December, 46mm (1.81") of precipitation is accumulated.
When are the longest days?
With an average of 13h and 42min of daylight, December has the longest days of the year.
What is the average length of the day in December in Rivonia?
In Rivonia, the average day length in December is 13h and 44min.
When is the sunrise / sunset in December?
In December, on the first day of the month, sunrise is at 05:07 and sunset at 18:46. On the last day of the month, sunrise is at 05:18 and sunset at 19:03 SAST.
How long on average sun shines in December?
In Rivonia, the average sunshine duration in December is 11.3h.
How high is the UV index in December?
In December, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a moderate health threat from exposure to Sun's UV rays.
Average high temperature
Average low temperature
Average wind speed
Average max. wind speed
Average wind speed gusts
Average humidity
Average rainfall
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility
Average temperature in December
Rivonia, South Africa
  • Average high temperature in December: 27.5°C

The warmest month (with the highest average high temperature) is December (27.5°C).
The month with the lowest average high temperature is July (17.9°C).

  • Average low temperature in December: 16.3°C

The month with the highest average low temperature is January (16.6°C).
The coldest month (with the lowest average low temperature) is July (6.1°C).

Average pressure in December
Rivonia, South Africa
  • Average pressure in December: 1013.3mbar

The month with the highest atmospheric pressure is July (1024.6mbar).
The month with the lowest atmospheric pressure is January (1013.1mbar).

Average wind speed in December
Rivonia, South Africa
  • Average wind speed in December: 9.9km/h

The windiest month (with the highest average wind speed) is November (11.6km/h).
The calmest month (with the lowest average wind speed) is May (7.8km/h).

Average humidity in December
Rivonia, South Africa
  • Average humidity in December: 60%

The month with the highest relative humidity is February (64%).
The month with the lowest relative humidity is September (34%).

Average rainfall in December
Rivonia, South Africa
  • Average rainfall in December: 46mm

The wettest month (with the highest rainfall) is January (57mm).
The driest month (with the least rainfall) is July (1mm).

Average rainfall days in December
Rivonia, South Africa
  • Average rainfall days in December: 10.3 days

The month with the highest number of rainy days is January (13.2 days).
The month with the least rainy days is July (1.4 days).

Average daylight in December /
Average sunshine in December
Rivonia, South Africa
  • Average daylight in December: 13h and 4min

The month with the longest days is December (Average daylight: 13h and 42min).
The month with the shortest days is June (Average daylight: 10h and 30min).

  • Average sunshine in December: 11h and 2min

The month with the most sunshine is October (Average sunshine: 11h and 48min).
The month with the least sunshine is August (Average sunshine: 7h and 24min).

Average sunshine days in December
Rivonia, South Africa
  • Average sunshine days in December: 18.9 days

The month with the most sunshine days is July (28.9 days).
The month with the least sunshine days is January (16.3 days).

Average UV index in December
Rivonia, South Africa
  • Average UV index in December: 5

The months with the highest UV index are January, February, October and November (UV index 6).
The months with the lowest UV index are May, June and July (UV index 4).

Average cloud cover in December
Rivonia, South Africa
  • Average cloud cover in December: 25

The month with the most cloud cover is January (Cloud cover 26).
The month with the least cloud cover is August (Cloud cover 5).

Average visibility in December
Rivonia, South Africa
  • Average visibility in December: 10km

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

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