Temperatures in December
It's pleasantly warm in December in Saint Helena, Ascension and Tristan da Cunha with an average temperature of 21°C. Temperatures this month range from a low of 20°C to a high of 23°C. At night, you can expect temperatures between 17°C and 18°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for Saint Helena, Ascension and Tristan da Cunha in December. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of December
The month of December starts in Saint Helena, Ascension and Tristan da Cunha with mild temperatures, averaging around 21°C during the day and nights close to 17°C. There’s little chance of precipitation. The weather is mostly sunny and dry. A shirt, maybe a light cardigan, and light trousers will do.
Mid-December
By mid-December, the average daytime temperature rises to around 22°C, with nights close to 18°C. Not much precipitation expected during this period. It’s mostly dry with sunshine.
End of December
By the end of December, the average daytime temperature in Saint Helena, Ascension and Tristan da Cunha will be around 22°C, with nights close to 18°C. Barely any chance of precipitation. The weather will mostly be dry with lots of sunshine.
Precipitation in December
In December, there is an average of 16 mm of precipitation, spread over 6 days. The wind speed is around 5 Bft, mostly coming from the Southeast.
The average precipitation chance is 20% per day this month. Though that seems low, there are also a few days with a higher chance of precipitation.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in December for Saint Helena, Ascension and Tristan da Cunha. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
Saint Helena, Ascension and Tristan da Cunha in December |
UK | ||
|---|---|---|---|
 Average Temperature |
21°C | 9°C | |
 High Temp |
23°C | 11°C | |
| Low Temp |
20°C | 8°C | |
 Total Precipitation |
16 mm | 67 mm | |
| Rainy Days |
6 days | 10 days | |
November
UV index
The UV index is a maximum of 10 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Is December a good time to visit Saint Helena, Ascension and Tristan da Cunha?
Want nice weather? Then December is a great time to be in Saint Helena, Ascension and Tristan da Cunha. You’ll have pleasant temperatures and little chance of rain this month.
Temperature records for Saint Helena, Ascension and Tristan da Cunha in December
With 24°C, Saint Helena, Ascension and Tristan da Cunha hit the highest temperature in the last 10 years in December 2019. The lowest daytime temperature in this month was 17°C in 2017. The extreme night temperatures ranged from a low of 14°C to a high of 22°C.
You can check out all destinations in Saint Helena, Ascension and Tristan da Cunha for a full picture of the climate.
Daily Temperature in December in Saint Helena, Ascension and Tristan da Cunha
This chart shows the average daily temperatures, both day and night, for each day in December in Saint Helena, Ascension and Tristan da Cunha, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Weather experiences in December in Saint Helena, Ascension and Tristan da Cunha
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The December weather on the islands of St Helena, Ascension ... more
Daily Precipitation in December in Saint Helena, Ascension and Tristan da Cunha
The chart below shows the average daily precipitation in December for Saint Helena, Ascension and Tristan da Cunha, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for December, you can expect around 6 days of rain in Saint Helena, Ascension and Tristan da Cunha.
Daily UV Index in December in Saint Helena, Ascension and Tristan da Cunha
This chart shows the average daily UV index in December in Saint Helena, Ascension and Tristan da Cunha, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in December in Saint Helena, Ascension and Tristan da Cunha Over the Years
This chart shows the average temperature in December in Saint Helena, Ascension and Tristan da Cunha, measured in degrees Celsius, over the past years.
Total Precipitation in December in Saint Helena, Ascension and Tristan da Cunha Over the Years
This chart shows the average precipitation in December in Saint Helena, Ascension and Tristan da Cunha, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in December for Saint Helena, Ascension and Tristan da Cunha
Click on a specific day in December for detailed info on the typical weather on that day in Saint Helena, Ascension and Tristan da Cunha. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in December in Saint Helena, Ascension and Tristan da Cunha
The weather in December in Saint Helena, Ascension and Tristan da Cunha is rated 3 out of 5 stars by 1 visitor. Have you been to Saint Helena, Ascension and Tristan da Cunha? Share your weather experience to help other visitors.
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The December weather on the islands of St Helena, Ascension and Tristan da Cunha left much to be desired. It was often cloudy and occasionally rained. Temperatures can be pleasant, but not ideal for outdoor activities.— This text is automatically translated to English
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Average Weather in Saint Helena, Ascension and Tristan da Cunha by Month
Click on a month below to see detailed weather info for Saint Helena, Ascension and Tristan da Cunha. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
Or check out the climate of Saint Helena, Ascension and Tristan da Cunha for all months at once
