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 snowfall in December
- Average snowfall 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
The advent of December signifies a minor shift to an average high-temperature of a still moderately hot 27.5°C (81.5°F), aligning closely with November. Williston's December nights represent a significant downturn from the day's heat, with an average temperature of 15.1°C (59.2°F).Humidity
In December, the average relative humidity in Williston is 38%.Rainfall
In Williston, in December, it is raining for 4.1 days, with typically 13mm (0.51") of accumulated precipitation. In Williston, during the entire year, the rain falls for 48.1 days and collects up to 112mm (4.41") of precipitation.Snowfall
In Williston, snow does not fall in January through June, October through December.Daylight
December has the longest days of the year, with an average of 14h and 6min of daylight.On the first day of the month, sunrise is at 05:24 and sunset at 19:26. On the last day of December, in Williston, South Africa, sunrise is at 05:34 and sunset at 19:44 SAST.
Sunshine
In December, the average sunshine is 11.9h.UV index
January, February, November and December, with an average maximum UV index of 6, are months with the highest UV index in Williston, South Africa. A UV Index estimate of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The UV index of 6 during December translates into the following guidance:
Refrain from overexposure. Fair-skinned individuals could burn in under 20 minutes. Stay out of direct sunlight and seek shade between 10 a.m. and 4 p.m., when UV radiation is strongest, but remember that shade devices may not offer full sun protection. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.
Frequently asked questions
What is the usual temperature for Williston in December?
What is the average humidity in December in Williston?
How many days does it rain in December in Williston?
When it does not snow in Williston?
When are the longest days in Williston?
What is the average length of the day in December in Williston?
When is the sunrise / sunset in December in Williston?
How many hours of sunshine does Williston have in December?
What is the month with the highest UV index in Williston?
What is the UV index reading in December in Williston?
Average temperature in December
Williston, South Africa
- Average high temperature in December: 27.5°C
The warmest month (with the highest average high temperature) is January (29.1°C).
The month with the lowest average high temperature is June (13.2°C).
- Average low temperature in December: 15.1°C
The months with the highest average low temperature are January and February (16.8°C).
The coldest month (with the lowest average low temperature) is July (3.9°C).
Average pressure in December
Williston, South Africa
- Average pressure in December: 1012.1mbar
The month with the highest atmospheric pressure is July (1023.4mbar).
The month with the lowest atmospheric pressure is January (1011.7mbar).
Average wind speed in December
Williston, South Africa
- Average wind speed in December: 17.9km/h
The windiest month (with the highest average wind speed) is June (19.2km/h).
The calmest month (with the lowest average wind speed) is March (15.8km/h).
Average humidity in December
Williston, South Africa
- Average humidity in December: 38%
The month with the highest relative humidity is June (57%).
The month with the lowest relative humidity is November (36%).
Average rainfall in December
Williston, South Africa
- Average rainfall in December: 13mm
The wettest month (with the highest rainfall) is January (21mm).
The driest month (with the least rainfall) is November (3mm).
Average rainfall days in December
Williston, South Africa
- Average rainfall days in December: 4.1 days
The month with the highest number of rainy days is January (5.9 days).
The month with the least rainy days is November (2.6 days).
Average snowfall in December
Williston, South Africa
- Average snowfall in December: 0mm
The month with the highest snowfall is July (6mm).
The months with the least snowfall are January, February, March, April, May, June, October, November and December (0mm).
Average snowfall days in December
Williston, South Africa
- Average snowfall days in December: 0 days
The month with the highest number of snowfall days is July (0.8 days).
The months with the least snowfall days are January, February, March, October, November and December (0 days).
Average daylight in December /
Average sunshine in December
Williston, South Africa
- Average daylight in December: 14h and 1min
The month with the longest days is December (Average daylight: 14h and 6min).
The month with the shortest days is June (Average daylight: 10h and 6min).
- Average sunshine in December: 11h and 5min
The months with the most sunshine are January and November (Average sunshine: 12h and 0min).
The month with the least sunshine is June (Average sunshine: 7h and 12min).
Average sunshine days in December
Williston, South Africa
- Average sunshine days in December: 26 days
The month with the most sunshine days is May (27 days).
The month with the least sunshine days is February (21.8 days).
Average UV index in December
Williston, 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 3).
Average cloud cover in December
Williston, South Africa
- Average cloud cover in December: 11
The month with the most cloud cover is June (Cloud cover 20).
The months with the least cloud cover are January, February and March (Cloud cover 10).
Average visibility in December
Williston, 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).
Williston, South Africa
Weather forecast for your location
2. Allow the app to use your location
