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
An average high-temperature of a still moderately hot 27°C (80.6°F) marks December, exhibiting a close resemblance to the conditions in November. Isando encounters an average low-temperature of 16°C (60.8°F) during December nights.Heat index
Throughout December, the heat index is computed to be 28°C (82.4°F). Enduring exposure and continuous activity might cause a feeling of tiredness and induce heat cramps.Understand that the heat index values take into account shaded locations and mild 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 'felt air temperature' or 'feels like', arises from combining readings of air temperature and relative moisture content. This effect is personal, shaped by the individual's physical activity and heat sensitivity, influenced by factors including wind, clothing, and metabolic variances. Considering the impact of direct sunlight, it's possible for the heat index to surge by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it's vital to remain hydrated, particularly during prolonged physical activities.
Humidity
The average relative humidity in December is 61%.Rainfall
In Isando, during December, the rain falls for 19.5 days and regularly aggregates up to 82mm (3.23") of precipitation. Throughout the year, in Isando, there are 115.7 rainfall days, and 418mm (16.46") of precipitation is accumulated.Daylight
With an average of 13h and 42min of daylight, December has the longest days of the year.On the first day of December in Isando, sunrise is at 05:06 and sunset at 18:46. On the last day of the month, sunrise is at 05:17 and sunset at 19:02 SAST.
Sunshine
In Isando, the average sunshine in December is 11.2h.UV index
In December, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the average person.Note: The UV index of 5 during December leads to these advisories:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in December in Isando?
What is the average humidity in December in Isando?
How many days does it rain in December in Isando?
When are the longest days in Isando?
How many hours of daylight does Isando have in December?
When are sunrise and sunset in December in Isando?
How long on average sun shines in December in Isando?
What is the UV index reading in December in Isando?
Average temperature in December
Isando, South Africa
- Average high temperature in December: 27°C
The warmest month (with the highest average high temperature) is January (27.1°C).
The month with the lowest average high temperature is July (17.6°C).
- Average low temperature in December: 16°C
The months with the highest average low temperature are January and December (16°C).
The coldest month (with the lowest average low temperature) is July (5.9°C).
Average pressure in December
Isando, South Africa
- Average pressure in December: 1013.5mbar
The month with the highest atmospheric pressure is July (1024.7mbar).
The month with the lowest atmospheric pressure is January (1013.3mbar).
Average wind speed in December
Isando, South Africa
- Average wind speed in December: 9.9km/h
The windiest months (with the highest average wind speed) are October and November (11.6km/h).
The calmest month (with the lowest average wind speed) is May (8km/h).
Average humidity in December
Isando, South Africa
- Average humidity in December: 61%
The months with the highest relative humidity are January and February (65%).
The month with the lowest relative humidity is September (35%).
Average rainfall in December
Isando, South Africa
- Average rainfall in December: 82mm
The wettest month (with the highest rainfall) is January (86mm).
The driest month (with the least rainfall) is July (0mm).
Average rainfall days in December
Isando, South Africa
- Average rainfall days in December: 19.5 days
The month with the highest number of rainy days is January (20.3 days).
The month with the least rainy days is July (0.9 days).
Average daylight in December /
Average sunshine in December
Isando, 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 1min
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
Isando, South Africa
- Average sunshine days in December: 8.3 days
The month with the most sunshine days is July (29.7 days).
The month with the least sunshine days is January (8 days).
Average UV index in December
Isando, South Africa
- Average UV index in December: 5
The months with the highest UV index are January, 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
Isando, South Africa
- Average cloud cover in December: 26
The month with the most cloud cover is January (Cloud cover 28).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility in December
Isando, South Africa
- Average visibility in December: 10km
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January and February (9km).
