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
With the advent of December, Mariannhill's high-temperatures adjust to a still moderately hot 25°C (77°F), closely aligning with the preceding month. An average low-temperature of 18.6°C (65.5°F) marks the nights throughout December.Humidity
The most humid month in Mariannhill, South Africa, is December, with an average relative humidity of 83%.Rainfall
December is the month with the most rainfall. Rain falls for 21.7 days and accumulates 78mm (3.07") of precipitation.Daylight
December has the longest days of the year in Mariannhill, South Africa, with an average of 14h and 0min of daylight.On the first day of the month, sunrise is at 04:48 and sunset at 18:43. On the last day of December, sunrise is at 04:58 and sunset at 19:00 SAST.
Sunshine
The average sunshine in December is 7.3h.UV index
The months with the highest UV index in Mariannhill are January through March and December, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for the ordinary person.Note: In December, the maximum UV index of 6 translates into these guidelines:
Persist with precautions and heed sun safety advice. Prevention of sunburn is compulsory. Avoid exposure to the Sun and try to stay in the shade between 10 a.m. and 4 p.m., when UV radiation is most potent, but be aware that parasols or canopies may not offer full protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
Frequently asked questions
What are December temperatures in Mariannhill?
What is the most humid month in Mariannhill?
What is the average humidity in December in Mariannhill?
What is the rainiest month in Mariannhill?
How many days does it rain in December in Mariannhill?
When are the longest days in Mariannhill?
What is the average length of the day in December in Mariannhill?
When are sunrise and sunset in December in Mariannhill?
How long on average sun shines in December in Mariannhill?
When is the highest UV index in Mariannhill?
What is the UV index reading in December in Mariannhill?
Average temperature in December
Mariannhill, South Africa
- Average high temperature in December: 25°C
The warmest month (with the highest average high temperature) is February (26.6°C).
The month with the lowest average high temperature is July (21.2°C).
- Average low temperature in December: 18.6°C
The month with the highest average low temperature is February (20°C).
The coldest month (with the lowest average low temperature) is July (13.2°C).
Average pressure in December
Mariannhill, South Africa
- Average pressure in December: 1014.3mbar
The month with the highest atmospheric pressure is July (1023.2mbar).
The month with the lowest atmospheric pressure is January (1014.2mbar).
Average wind speed in December
Mariannhill, South Africa
- Average wind speed in December: 12.6km/h
The windiest month (with the highest average wind speed) is October (13.9km/h).
The calmest month (with the lowest average wind speed) is May (10.7km/h).
Average humidity in December
Mariannhill, South Africa
- Average humidity in December: 83%
The month with the highest relative humidity is December (83%).
The months with the lowest relative humidity are June and July (64%).
Average rainfall in December
Mariannhill, South Africa
- Average rainfall in December: 78mm
The wettest month (with the highest rainfall) is December (78mm).
The driest month (with the least rainfall) is June (10mm).
Average rainfall days in December
Mariannhill, South Africa
- Average rainfall days in December: 21.7 days
The month with the highest number of rainy days is December (21.7 days).
The month with the least rainy days is June (5.8 days).
Average daylight in December /
Average sunshine in December
Mariannhill, South Africa
- Average daylight in December: 14h and 0min
The month with the longest days is December (Average daylight: 14h and 0min).
The month with the shortest days is June (Average daylight: 10h and 18min).
- Average sunshine in December: 7h and 2min
The month with the most sunshine is February (Average sunshine: 8h and 36min).
The month with the least sunshine is April (Average sunshine: 6h and 0min).
Average sunshine days in December
Mariannhill, South Africa
- Average sunshine days in December: 6.5 days
The months with the most sunshine days are June and July (22.1 days).
The month with the least sunshine days is December (6.5 days).
Average UV index in December
Mariannhill, South Africa
- Average UV index in December: 6
The months with the highest UV index are January, February, March and December (UV index 6).
The months with the lowest UV index are April, May, June, July, August, September, October and November (UV index 5).
Average cloud cover in December
Mariannhill, South Africa
- Average cloud cover in December: 57
The month with the most cloud cover is December (Cloud cover 57).
The month with the least cloud cover is June (Cloud cover 17).
Average visibility in December
Mariannhill, South Africa
- Average visibility in December: 9km
The months with the highest visibility are April, May, June, July, August and September (10km).
The months with the lowest visibility are January, February, March, October, November and December (9km).
Mariannhill, South Africa
Weather forecast for your location
2. Allow the app to use your location
