Average weather for Saint Helena, Ascension and Tristan da Cunha 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.
Start of December
The month of December starts in Saint Helena, Ascension and Tristan da Cunha with mild temps, averaging around 21°C during the day and nights around 17°C. There’s little chance of precipitation. The weather’s mostly sunny and dry. A shirt, maybe a light sweater, and thin pants will do.
Mid December
By mid-December, daytime temps rise to around 22°C, with nights around 18°C. Not much precipitation expected during this period. It’s mostly dry and sunny.
End of December
By the end of December, the average daytime temperature in Saint Helena, Ascension and Tristan da Cunha is around 22°C, while nighttime temps are about 18°C. There’s hardly any chance of precipitation. The weather will be mostly dry with plenty of sun.
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.
Saint Helena, Ascension and Tristan da Cunha in December |
New York | ||
|---|---|---|---|
 Average temperature |
21°C | 9°C | |
 Max. temperature |
23°C | 12°C | |
| Min. temperature |
20°C | -5°C | |
 Total precipitation |
16 mm | 133 mm | |
| Rainy days |
6 days | 17 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?
Looking for great weather? December is a good time to be in Saint Helena, Ascension and Tristan da Cunha. The temperatures are nice, and there’s little chance of rain this month.
Temperature records
With 24°C in 2019, Saint Helena, Ascension and Tristan da Cunha reached the highest temperature in December over the past 10 years. The lowest daytime temperature in this month was 17°C in 2017. The extreme nighttime temperatures ranged from a lowest recorded value of 14°C to a highest value of 22°C.
Daily Temperature in December in Saint Helena, Ascension and Tristan da Cunha
This chart shows the average daily high and low temperatures in December for Saint Helena, Ascension and Tristan da Cunha, in degrees Celsius. The red line represents the highs, and the blue line shows the lows. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, provide the average temperatures for 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 millimeters over the past few years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are listed 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 it rained more often. But remember, it’s just an average, and every day can be different. Based on historical weather data for December, you can expect about 6 days of precipitation 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 few 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 millimeters over the past years. Precipitation is always measured as water, whether it’s snow or hail.
Daily weather in December for Saint Helena, Ascension and Tristan da Cunha
Click on any day in December to get detailed info about the usual 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
