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
December
Weather in December
Temperature
The advent of December denotes an average high-temperature of a still moderately hot 26.5°C (79.7°F), subtly different from November's 23.6°C (74.5°F). Despite the significant gap from daytime peaks, Swellendam experiences an average low-temperature of 14.3°C (57.7°F) in December.Humidity
The average relative humidity in December is 54%.Rainfall
February, April, October and December are months with the least rain when the rain falls for 6.8 days and typically aggregates up to 9mm (0.35") of rain.Snowfall
January through June, September through December are months without snowfall.Daylight
The month with the longest days is December, with an average of 14h and 24min of daylight.On the first day of December in Swellendam, sunrise is at 05:19 and sunset at 19:35. On the last day of the month, sunrise is at 05:29 and sunset at 19:52 SAST.
Sunshine
The month with the most sunshine in Swellendam is December, with an average of 11.7h of sunshine.UV index
January, February and December, with an average maximum UV index of 6, are months with the highest UV index in Swellendam. A UV Index estimate of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for the average person.Note: A maximum high UV index of 6 in December translates into the following recommendations:
Conform to measures and uphold sun safety traditions. Warding off skin and eye harm is necessary. Avoid direct Sun exposure and stay in the shade between 10 a.m. and 4 p.m., a time when UV radiation is most intense, noting that not all shade structures offer full protection. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Swellendam in December?
What is the average humidity in December in Swellendam?
What is the driest month in Swellendam?
How many days does it rain in December in Swellendam?
When it does not snow in Swellendam?
When are the longest days in Swellendam?
What is the average length of the day in December in Swellendam?
What time are sunrise and sunset in December in Swellendam?
What month has the most sunshine in Swellendam?
How many hours of sunshine does Swellendam have in December?
What are the months with the highest UV index in Swellendam?
What is the UV index intensity in December in Swellendam?
Average temperature in December
Swellendam, South Africa
- Average high temperature in December: 26.5°C
The warmest month (with the highest average high temperature) is January (28.3°C).
The month with the lowest average high temperature is June (14°C).
- Average low temperature in December: 14.3°C
The month with the highest average low temperature is February (16.1°C).
The coldest month (with the lowest average low temperature) is July (5.6°C).
Average pressure in December
Swellendam, South Africa
- Average pressure in December: 1013.5mbar
The month with the highest atmospheric pressure is July (1022.4mbar).
The month with the lowest atmospheric pressure is January (1012.9mbar).
Average wind speed in December
Swellendam, South Africa
- Average wind speed in December: 12.4km/h
The windiest month (with the highest average wind speed) is November (13.1km/h).
The calmest month (with the lowest average wind speed) is May (10.7km/h).
Average humidity in December
Swellendam, South Africa
- Average humidity in December: 54%
The month with the highest relative humidity is June (64%).
The months with the lowest relative humidity are February and November (53%).
Average rainfall in December
Swellendam, South Africa
- Average rainfall in December: 9mm
The wettest month (with the highest rainfall) is June (22mm).
The driest months (with the least rainfall) are February, April, October and December (9mm).
Average rainfall days in December
Swellendam, South Africa
- Average rainfall days in December: 6.8 days
The month with the highest number of rainy days is April (7.5 days).
The month with the least rainy days is November (5 days).
Average snowfall in December
Swellendam, South Africa
- Average snowfall in December: 0mm
The month with the highest snowfall is August (3mm).
The months with the least snowfall are January, February, March, April, May, June, September, October, November and December (0mm).
Average snowfall days in December
Swellendam, South Africa
- Average snowfall days in December: 0 days
The month with the highest number of snowfall days is August (0.3 days).
The months with the least snowfall days are January, February, March, April, May, September, October, November and December (0 days).
Average daylight in December /
Average sunshine in December
Swellendam, South Africa
- Average daylight in December: 14h and 2min
The month with the longest days is December (Average daylight: 14h and 24min).
The month with the shortest days is June (Average daylight: 9h and 54min).
- Average sunshine in December: 11h and 4min
The month with the most sunshine is December (Average sunshine: 11h and 42min).
The month with the least sunshine is June (Average sunshine: 6h and 36min).
Average sunshine days in December
Swellendam, South Africa
- Average sunshine days in December: 20.8 days
The month with the most sunshine days is May (24.1 days).
The month with the least sunshine days is February (19.8 days).
Average UV index in December
Swellendam, South Africa
- Average UV index in December: 6
The months with the highest UV index are January, February and December (UV index 6).
The month with the lowest UV index is June (UV index 3).
Average cloud cover in December
Swellendam, South Africa
- Average cloud cover in December: 17
The month with the most cloud cover is June (Cloud cover 27).
The month with the least cloud cover is February (Cloud cover 14).
Average visibility in December
Swellendam, 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).
