Weather in December
December, the final chapter of the year in Tristan da Cunha, ushers in a temperate climate. A notable feature in this month is the abundant daylight hours at 14.7 that paints long and bright days. The sea temperature witnesses a rise, matching up to the hiking atmospheric temperatures. The fall in rainfall to 127mm (5") serves as the icing on the cake. As the year closes, the weather balances out between warm and cooler temperatures, offering an ideal ambiance for the holiday season.
Note: Swimming is not a pleasant activity for most when the water temperature is 16°C (60.8°F). As the water temperature drops from 21°C (69.8°F) to 15°C (59°F), breathing becomes more difficult to control.
On the first day of December, sunrise is at 05:22 and sunset at 19:54. On the last day of the month, sunrise is at 05:32 and sunset at 20:12 GMT.
Note: The maximum daily UV index of 11 during December translates into the following directions:
Execute all vital precautions. Preventing sun damage is of utmost importance. The time between 10 a.m. and 4 p.m. is when UV radiation is at its peak. Limit exposure to direct sunlight during these hours. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
[Resources]Temperature
December's weather displays an average high-temperature of a still comfortable 19°C (66.2°F), slightly varied from November's 17°C (62.6°F). Tristan da Cunha nights in December witness a mild cool down to an average temperature of 15°C (59°F).Rainfall
In Tristan da Cunha, during December, the rain falls for 19 days and regularly aggregates up to 127mm (5") of precipitation. In Tristan da Cunha, during the entire year, the rain falls for 251 days and collects up to 1681mm (66.18") of precipitation.Sea temperature
In Tristan da Cunha, the average seawater temperature in December is 16°C (60.8°F).Note: Swimming is not a pleasant activity for most when the water temperature is 16°C (60.8°F). As the water temperature drops from 21°C (69.8°F) to 15°C (59°F), breathing becomes more difficult to control.
Daylight
With an average of 14h and 42min of daylight, December has the longest days of the year.On the first day of December, sunrise is at 05:22 and sunset at 19:54. On the last day of the month, sunrise is at 05:32 and sunset at 20:12 GMT.
Sunshine
In Tristan da Cunha, the average sunshine in December is 4.2h.UV index
In December, the average daily maximum UV index is 11. A UV Index reading of 11, and higher, represents an extreme health hazard from exposure to the Sun's UV radiation for the average person.Note: The maximum daily UV index of 11 during December translates into the following directions:
Execute all vital precautions. Preventing sun damage is of utmost importance. The time between 10 a.m. and 4 p.m. is when UV radiation is at its peak. Limit exposure to direct sunlight during these hours. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
Frequently asked questions
What is the average December temperature in Tristan da Cunha?
An average high-temperature, in December, in Tristan da Cunha, is 19°C (66.2°F) and the average low-temperature is 15°C (59°F).
How much does it rain in Tristan da Cunha in December?
In December, in Tristan da Cunha, the rain falls for 19 days. Throughout December, 127mm (5") of precipitation is accumulated.
What is the sea temperature in December in Tristan da Cunha?
In Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha, in December, the average water temperature is 16°C (60.8°F). For most, swimming in 16°C (60.8°F) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 21°C (69.8°F) to 15°C (59°F).
When are the longest days in Tristan da Cunha?
The month with the longest days is December, with an average of 14h and 42min of daylight.
How many hours of daylight does Tristan da Cunha have in December?
In Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha, the average day length in December is 14h and 40min.
When are sunrise and sunset in December in Tristan da Cunha?
In December, on the first day of the month, sunrise is at 05:22 and sunset at 19:54. On the last day of the month, sunrise is at 05:32 and sunset at 20:12 GMT.
How long on average sun shines in December in Tristan da Cunha?
The average sunshine duration in December is 4.2h.
What is the UV index reading in December in Tristan da Cunha?
In Tristan da Cunha, the average daily maximum UV index in December is 11. A UV Index of 11, and more, symbolizes an ultimate hazard to health from unprotected exposure to UV radiation.
Average temperature in December
Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha
- Average high temperature in December: 19°C
The warmest month (with the highest average high temperature) is February (21°C).
The months with the lowest average high temperature are July, August and September (14°C).
- Average low temperature in December: 15°C
The month with the highest average low temperature is February (17°C).
The coldest months (with the lowest average low temperature) are August and September (10°C).
Average rainfall in December
Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha
- Average rainfall in December: 127mm
The wettest month (with the highest rainfall) is August (175mm).
The driest month (with the least rainfall) is January (93mm).
Average rainfall days in December
Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha
- Average rainfall days in December: 19 days
The month with the highest number of rainy days is August (26 days).
The month with the least rainy days is February (16 days).
Average sea temperature in December
Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha
- Average sea temperature in December: 16°C
The best months for swimming (with the highest average sea temperature) are February and March (18°C).
The coldest months (with the lowest average sea temperature) are August and September (13°C).
Average daylight in December /
Average sunshine in December
Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha
- Average daylight in December: 14h and 4min
The month with the longest days is December (Average daylight: 14h and 42min).
The month with the shortest days is June (Average daylight: 9h and 42min).
- Average sunshine in December: 4h and 1min
The month with the most sunshine is February (Average sunshine: 5h and 6min).
The month with the least sunshine is June (Average sunshine: 3h and 18min).
Average UV index in December
Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha
- Average UV index in December: 11
The month with the highest UV index is January (UV index 12).
The months with the lowest UV index are June and July (UV index 2).
Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha
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