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 December's arrival, Heilbron's weather records an average high-temperature of a still warm 28.5°C (83.3°F), marking little difference from November's 28°C (82.4°F). Throughout December, Heilbron anticipates an average low-temperature of 16.8°C (62.2°F).Heat index
Throughout December, the heat index is appraised at 29°C (84.2°F). If one persists in activity during exposure, it could induce weariness and subsequently, heat cramps.Data suggests that the heat index is set for environments in shade and with a light wind. Direct sunlight has the potential to heighten heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', gives an indication of how one might feel in terms of heat after considering humidity. Depending on the activity and the individual's heat perception, which may vary due to factors including wind, clothing, and metabolic variations, this effect remains subjective. Remember, direct sunlight exposure can heighten the heat impact and might increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Children frequently underestimate the importance of resting and drinking fluids. Thirst is a symptom of advanced dehydration - hence the need to hydrate regularly, especially during protracted physical exercises.
Humidity
In Heilbron, the average relative humidity in December is 54%.Rainfall
December is the month with the most rainfall. Rain falls for 12.5 days and accumulates 57mm (2.24") of precipitation.Daylight
December has the longest days of the year in Heilbron, South Africa, with an average of 13h and 48min of daylight.On the first day of the month, sunrise is at 05:05 and sunset at 18:49. On the last day of December, in Heilbron, sunrise is at 05:16 and sunset at 19:06 SAST.
Sunshine
The average sunshine in December in Heilbron is 11.4h.UV index
The months with the highest UV index in Heilbron are January, February, October through December, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for the ordinary person.Note: A daily high UV index of 6 in December leads to these guidelines:
Implement precautions and maintain sun safety methods. Avoidance of sunburn is demanded. Make an effort to avoid direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation, and note that objects like parasols or canopies might not offer full sun protection. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Frequently asked questions
How hot is December in Heilbron?
What is the average humidity in December in Heilbron?
What is the wettest month in Heilbron?
How many days does it rain in December in Heilbron?
When are the longest days in Heilbron?
How many hours of daylight does Heilbron have in December?
When are sunrise and sunset in December in Heilbron?
How many hours of sunshine does Heilbron have in December?
What are the months with the highest UV index in Heilbron?
How high is the UV index in December in Heilbron?
Average temperature in December
Heilbron, South Africa
- Average high temperature in December: 28.5°C
The warmest month (with the highest average high temperature) is January (28.8°C).
The months with the lowest average high temperature are June and July (17.8°C).
- Average low temperature in December: 16.8°C
The months with the highest average low temperature are January and December (16.8°C).
The coldest month (with the lowest average low temperature) is July (5.1°C).
Average pressure in December
Heilbron, South Africa
- Average pressure in December: 1013.1mbar
The month with the highest atmospheric pressure is July (1024.8mbar).
The month with the lowest atmospheric pressure is January (1013mbar).
Average wind speed in December
Heilbron, South Africa
- Average wind speed in December: 12.2km/h
The windiest month (with the highest average wind speed) is November (13.7km/h).
The calmest month (with the lowest average wind speed) is May (8.7km/h).
Average humidity in December
Heilbron, South Africa
- Average humidity in December: 54%
The month with the highest relative humidity is February (60%).
The month with the lowest relative humidity is September (30%).
Average rainfall in December
Heilbron, South Africa
- Average rainfall in December: 57mm
The wettest month (with the highest rainfall) is December (57mm).
The driest months (with the least rainfall) are July and August (2mm).
Average rainfall days in December
Heilbron, South Africa
- Average rainfall days in December: 12.5 days
The month with the highest number of rainy days is December (12.5 days).
The month with the least rainy days is August (1 days).
Average daylight in December /
Average sunshine in December
Heilbron, 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: 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
Heilbron, South Africa
- Average sunshine days in December: 16.9 days
The month with the most sunshine days is August (29.6 days).
The month with the least sunshine days is December (16.9 days).
Average UV index in December
Heilbron, South Africa
- Average UV index in December: 6
The months with the highest UV index are January, February, October, 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
Heilbron, South Africa
- Average cloud cover in December: 21
The month with the most cloud cover is January (Cloud cover 22).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility in December
Heilbron, 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).
Heilbron, South Africa
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