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
Groenvlei's temperatures tend to reach their peak averages in December, with a high of 27.2°C (81°F) and a low of 14.9°C (58.8°F).Heat index
During December, the heat index is appraised at 29°C (84.2°F). Enduring exposure and ongoing activity could cause a sense of fatigue and subsequent heat cramps.For clarity, heat index numbers account for light winds and areas under shade. Direct sunlight might cause an increase of up to 15 Fahrenheit (8 Celsius) degrees in the heat index.
Note: The heat index, also known as 'apparent temperature' or 'feels like', comes about by integrating the temperature readings with the humidity levels. This effect tends to be personal, with the weather perception differing among individuals due to variations in body mass, height, and exertion. In direct sunlight, the heat's impact can be heightened, potentially leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Young ones are generally at greater risk than adults due to their limited sweating ability. In addition, their large skin surface relative to their small bodies and higher heat production from their activities add to their vulnerability.
Humidity
The average relative humidity in December in Groenvlei is 70%.Rainfall
December is the month with the most rainfall. Rain falls for 23.7 days and accumulates 94mm (3.7") of precipitation.Daylight
With an average of 13h and 48min of daylight, December has the longest days of the year.On the first day of the month, sunrise is at 04:55 and sunset at 18:40. On the last day of December, in Groenvlei, sunrise is at 05:06 and sunset at 18:57 SAST.
Sunshine
In December, the average sunshine is 10.8h.UV index
The months with the highest UV index in Groenvlei, South Africa, are January, November and December, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: A daily maximum UV index of 6 in December translates into the following instructions:
Adhere to precautions and respect sun safety doctrines. Avoiding sunburn is vital. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note 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
What month is the hottest in Groenvlei?
What are the temperatures in Groenvlei in December?
What is the average humidity in December in Groenvlei?
What is the wettest month in Groenvlei?
How many days does it rain in December in Groenvlei?
When are the longest days in Groenvlei?
What is the average length of the day in December in Groenvlei?
When is the sunrise / sunset in December in Groenvlei?
How long on average sun shines in December in Groenvlei?
What is the month with the highest UV index in Groenvlei?
What is the UV index intensity in December in Groenvlei?
Average temperature in December
Groenvlei, South Africa
- Average high temperature in December: 27.2°C
The warmest month (with the highest average high temperature) is December (27.2°C).
The month with the lowest average high temperature is June (18.5°C).
- Average low temperature in December: 14.9°C
The month with the highest average low temperature is December (14.9°C).
The coldest month (with the lowest average low temperature) is July (5.3°C).
Average pressure in December
Groenvlei, South Africa
- Average pressure in December: 1014.8mbar
The month with the highest atmospheric pressure is July (1024.5mbar).
The month with the lowest atmospheric pressure is December (1014.8mbar).
Average wind speed in December
Groenvlei, South Africa
- Average wind speed in December: 8.5km/h
The windiest month (with the highest average wind speed) is September (10.3km/h).
The calmest month (with the lowest average wind speed) is March (7.1km/h).
Average humidity in December
Groenvlei, South Africa
- Average humidity in December: 70%
The month with the highest relative humidity is February (75%).
The month with the lowest relative humidity is August (44%).
Average rainfall in December
Groenvlei, South Africa
- Average rainfall in December: 94mm
The wettest month (with the highest rainfall) is December (94mm).
The driest month (with the least rainfall) is July (2mm).
Average rainfall days in December
Groenvlei, South Africa
- Average rainfall days in December: 23.7 days
The month with the highest number of rainy days is December (23.7 days).
The month with the least rainy days is July (2.3 days).
Average daylight in December /
Average sunshine in December
Groenvlei, South Africa
- Average daylight in December: 13h and 5min
The month with the longest days is December (Average daylight: 13h and 48min).
The month with the shortest days is June (Average daylight: 10h and 24min).
- Average sunshine in December: 10h and 5min
The months with the most sunshine are October and November (Average sunshine: 11h and 12min).
The month with the least sunshine is April (Average sunshine: 7h and 6min).
Average sunshine days in December
Groenvlei, South Africa
- Average sunshine days in December: 3.4 days
The month with the most sunshine days is July (27.2 days).
The month with the least sunshine days is December (3.4 days).
Average UV index in December
Groenvlei, South Africa
- Average UV index in December: 6
The months with the highest UV index are January, November and December (UV index 6).
The months with the lowest UV index are May, June and July (UV index 4).
Average cloud cover in December
Groenvlei, South Africa
- Average cloud cover in December: 34
The month with the most cloud cover is January (Cloud cover 40).
The months with the least cloud cover are June and July (Cloud cover 9).
Average visibility in December
Groenvlei, South Africa
- Average visibility in December: 9km
The months with the highest visibility are May, June, July, August, September and October (10km).
The months with the lowest visibility are January, February and March (8km).
