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
December's beginning signals an average high-temperature of a still warm 28.9°C (84°F), barely different from November's 27°C (80.6°F). Jansenville's average nighttime temperatures present a clear contrast to its daytime highs, measured at a comfortable 16.2°C (61.2°F) in December.Heat index
The heat index value during December is calculated to be a tropical 31°C (87.8°F). With extended exposure and activity, one might feel exhausted and experience heat cramps.Always consider that heat index estimations are for light winds and places in the shade. Exposure to unobstructed sunshine could lead to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', shows a temperature sensation when both heat and moisture conditions are combined. This impact is subjective, influenced by the person's physical activity and individual heat perception, affected by factors including wind, attire, and metabolic differences. One's exposure to direct sunlight has the potential to intensify the heat sensation, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Children often fail to understand the importance of rest and rehydration. Thirst is a late manifestation of dehydration - hence, it is crucial to stay hydrated, especially during ongoing physical activities.
Humidity
The months with the highest humidity are January through March and December, with an average relative humidity of 58%.Rainfall
In Jansenville, during December, the rain falls for 10.1 days and regularly aggregates up to 16mm (0.63") of precipitation. Throughout the year, there are 88.8 rainfall days, and 181mm (7.13") of precipitation is accumulated.Daylight
December has the longest days of the year in Jansenville, with an average of 14h and 18min of daylight.On the first day of the month, sunrise is at 05:05 and sunset at 19:15. On the last day of December, sunrise is at 05:15 and sunset at 19:33 SAST.
Sunshine
In Jansenville, the average sunshine in December is 10.8h.UV index
January, February, November and December, with an average maximum UV index of 6, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for average individuals.Note: An average UV index of 6 in December transforms into this advice:
Act on precautions and pay attention to sun safety recommendations. Avoidance of sunburn is obligatory. Remember that UV radiation from the Sun is strongest between 10 a.m. and 4 p.m. Make an effort to limit direct sun exposure during this time. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is it hot during December?
What is the most humid month?
What is the average humidity in December?
How much does it rain in December?
When are the longest days?
What is the average length of the day in December in Jansenville?
What time are sunrise and sunset in December?
How many hours of sunshine does Jansenville have in December?
What is the month with the highest UV index?
How high is the UV index in December?
Average temperature in December
Jansenville, South Africa
- Average high temperature in December: 28.9°C
The warmest month (with the highest average high temperature) is January (30.5°C).
The month with the lowest average high temperature is June (19.1°C).
- Average low temperature in December: 16.2°C
The month with the highest average low temperature is February (18°C).
The coldest month (with the lowest average low temperature) is July (8.5°C).
Average pressure in December
Jansenville, South Africa
- Average pressure in December: 1013.5mbar
The month with the highest atmospheric pressure is July (1022.9mbar).
The month with the lowest atmospheric pressure is January (1013.1mbar).
Average wind speed in December
Jansenville, South Africa
- Average wind speed in December: 14.7km/h
The windiest month (with the highest average wind speed) is December (14.7km/h).
The calmest months (with the lowest average wind speed) are April and May (11km/h).
Average humidity in December
Jansenville, South Africa
- Average humidity in December: 58%
The months with the highest relative humidity are January, February, March and December (58%).
The month with the lowest relative humidity is August (49%).
Average rainfall in December
Jansenville, South Africa
- Average rainfall in December: 16mm
The wettest months (with the highest rainfall) are January and February (28mm).
The driest month (with the least rainfall) is August (5mm).
Average rainfall days in December
Jansenville, South Africa
- Average rainfall days in December: 10.1 days
The month with the highest number of rainy days is January (10.3 days).
The month with the least rainy days is August (3.6 days).
Average daylight in December /
Average sunshine in December
Jansenville, South Africa
- Average daylight in December: 14h and 2min
The month with the longest days is December (Average daylight: 14h and 18min).
The month with the shortest days is June (Average daylight: 10h and 0min).
- Average sunshine in December: 10h and 5min
The month with the most sunshine is November (Average sunshine: 11h and 0min).
The months with the least sunshine are May, June and July (Average sunshine: 7h and 12min).
Average sunshine days in December
Jansenville, South Africa
- Average sunshine days in December: 15.3 days
The month with the most sunshine days is July (26 days).
The month with the least sunshine days is February (12.6 days).
Average UV index in December
Jansenville, South Africa
- Average UV index in December: 6
The months with the highest UV index are January, February, 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
Jansenville, South Africa
- Average cloud cover in December: 29
The month with the most cloud cover is December (Cloud cover 29).
The month with the least cloud cover is July (Cloud cover 16).
Average visibility in December
Jansenville, South Africa
- Average visibility in December: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
