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 sea temperature 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
Stepping into December, Port Saint Johns records an average high-temperature of a still warm 24.5°C (76.1°F), almost consistent with November. In Port Saint Johns, an average low-temperature of 13.9°C (57°F) is recorded during December nights.Humidity
The average relative humidity in December in Port Saint Johns is 82%.Rainfall
In Port Saint Johns, in December, during 23.5 rainfall days, 64mm (2.52") of precipitation is typically accumulated. In Port Saint Johns, during the entire year, the rain falls for 172 days and collects up to 557mm (21.93") of precipitation.Sea temperature
In December, the average sea temperature in Port Saint Johns is 24.3°C (75.7°F).Note: A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 24.3°C (75.7°F) water. (FYI: The Olympic swimming competition requires a water temperature between 25°C (77°F) and 28°C (82.4°F).)
Daylight
December has the longest days of the year in Port Saint Johns, with an average of 14h and 12min of daylight.On the first day of December in Port Saint Johns, South Africa, sunrise is at 04:49 and sunset at 18:52. On the last day of the month, sunrise is at 04:59 and sunset at 19:10 SAST.
Sunshine
In Port Saint Johns, the average sunshine in December is 7.3h.UV index
The months with the highest UV index are January through April, August, November and December, with an average maximum UV index of 5. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the ordinary person.Note: The maximum daily UV index of 5 in December converts into the following recommendations:
Act with care - The suggestion to avoid sunburn is emphasized. The solar radiation around mid-day is intense; avoid the Sun and stay safe. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Heads up! Sand and water reflection magnifies the UV exposure from the Sun.
Frequently asked questions
What are December temperatures in Port Saint Johns?
What is the average humidity in December in Port Saint Johns?
How many days does it rain in December in Port Saint Johns?
How warm is the water in December in Port Saint Johns?
When are the longest days in Port Saint Johns?
What is the average length of the day in December in Port Saint Johns?
What time are sunrise and sunset in December in Port Saint Johns?
How long on average sun shines in December in Port Saint Johns?
What is the month with the highest UV index in Port Saint Johns?
What is the UV index intensity in December in Port Saint Johns?
Average temperature in December
Port Saint Johns, South Africa
- Average high temperature in December: 24.5°C
The warmest months (with the highest average high temperature) are January and February (25.8°C).
The month with the lowest average high temperature is July (19.1°C).
- Average low temperature in December: 13.9°C
The month with the highest average low temperature is February (15.3°C).
The coldest month (with the lowest average low temperature) is July (7.2°C).
Average pressure in December
Port Saint Johns, South Africa
- Average pressure in December: 1014.3mbar
The month with the highest atmospheric pressure is July (1023.5mbar).
The month with the lowest atmospheric pressure is January (1014.1mbar).
Average wind speed in December
Port Saint Johns, South Africa
- Average wind speed in December: 7.4km/h
The windiest month (with the highest average wind speed) is August (8.4km/h).
The calmest month (with the lowest average wind speed) is March (6.5km/h).
Average humidity in December
Port Saint Johns, South Africa
- Average humidity in December: 82%
The month with the highest relative humidity is February (83%).
The months with the lowest relative humidity are June, July and August (55%).
Average rainfall in December
Port Saint Johns, South Africa
- Average rainfall in December: 64mm
The wettest month (with the highest rainfall) is January (93mm).
The driest month (with the least rainfall) is June (11mm).
Average rainfall days in December
Port Saint Johns, South Africa
- Average rainfall days in December: 23.5 days
The month with the highest number of rainy days is December (23.5 days).
The month with the least rainy days is June (5 days).
Average sea temperature in December
Port Saint Johns, South Africa
- Average sea temperature in December: 24.3°C
The best month for swimming (with the highest average sea temperature) is March (26.4°C).
The coldest month (with the lowest average sea temperature) is August (21°C).
Average daylight in December /
Average sunshine in December
Port Saint Johns, South Africa
- Average daylight in December: 14h and 1min
The month with the longest days is December (Average daylight: 14h and 12min).
The month with the shortest days is June (Average daylight: 10h and 6min).
- Average sunshine in December: 7h and 2min
The month with the most sunshine is October (Average sunshine: 8h and 36min).
The month with the least sunshine is April (Average sunshine: 6h and 12min).
Average sunshine days in December
Port Saint Johns, South Africa
- Average sunshine days in December: 4.5 days
The month with the most sunshine days is July (24.5 days).
The month with the least sunshine days is January (4.4 days).
Average UV index in December
Port Saint Johns, South Africa
- Average UV index in December: 5
The months with the highest UV index are January, February, March, April, August, November and December (UV index 5).
The months with the lowest UV index are May, June, July, September and October (UV index 4).
Average cloud cover in December
Port Saint Johns, South Africa
- Average cloud cover in December: 60
The month with the most cloud cover is December (Cloud cover 60).
The month with the least cloud cover is June (Cloud cover 17).
Average visibility in December
Port Saint Johns, South Africa
- Average visibility in December: 7km
The month with the highest visibility is June (10km).
The month with the lowest visibility is January (6km).
Port Saint Johns, South Africa
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