December weather forecast
Jamestown, Saint Helena, Ascension and Tristan da Cunha

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The valley town of Jamestown in Saint Helena, with a view of mountain slopes on both sides
The valley town of Jamestown in Saint Helena, with a view of mountain slopes on both sides

Weather in December

As the chapter of the year comes to a close, Jamestown, Saint Helena, Ascension, and Tristan da Cunha bask in the full glow of the Southern Hemisphere’s summer. The weather in December is typically warm and inviting, characterized by longer days and higher temperatures soaring up to 24°C (75.2°F). December paints the town’s atmosphere bright and cheery, with families and tourists making the most of the outdoor life. The 3mm (0.12") rainfall and approximately 13.1 hours of daylight make December a month of beaches, picnics, and endless outdoor activities. The patterns are predictably fair and favourable, supporting the ongoing festive seasonal vibes with an abundance of sun.

Temperature

With the advent of December, Jamestown experiences an average high-temperature of a still warm 24°C (75.2°F), mirroring a close resemblance to the previous month. An average nighttime temperature of 19°C (66.2°F) marks December.

Rainfall

January through October and December are months with rainfall. December is the first month it rains in Jamestown, Saint Helena, Ascension and Tristan da Cunha. Throughout December, in the average 1 rainfall days, it receives 3mm (0.12") of precipitation. In Jamestown, Saint Helena, Ascension and Tristan da Cunha, during the entire year, the rain falls for 40.7 days and collects up to 113mm (4.45") of precipitation.

Daylight

With an average of 13h and 6min of daylight, December has the longest days of the year in Jamestown.
On the first day of December in Jamestown, Saint Helena, Ascension and Tristan da Cunha, sunrise is at 05:41 and sunset at 18:42. On the last day of the month, sunrise is at 05:54 and sunset at 18:57 GMT.

Frequently asked questions

What is the temperature in December in Jamestown?

The high-temperature, in December, in Jamestown, records 24°C (75.2°F), while the low-temperature is 19°C (66.2°F).

When does it start to rain in Jamestown?

December is the first month it rains in Jamestown, Saint Helena, Ascension and Tristan da Cunha. Throughout December, in the average 1 rainfall days, it receives 3mm (0.12") of precipitation.

When are the longest days in Jamestown?

With an average of 13h and 6min of daylight, December has the longest days of the year in Jamestown, Saint Helena, Ascension and Tristan da Cunha.

How many hours of daylight does Jamestown have in December?

In Jamestown, Saint Helena, Ascension and Tristan da Cunha, the average day length in December is 13h and 4min.

What time are sunrise and sunset in December in Jamestown?

In December, on the first day of the month, sunrise is at 05:41 and sunset at 18:42. On the last day of the month, in Jamestown, sunrise is at 05:54 and sunset at 18:57 GMT.
Average rainfall
Average rainfall days
Average daylight

Average temperature in December
Jamestown, Saint Helena, Ascension and Tristan da Cunha

Average temperature in December - Jamestown, Saint Helena, Ascension and Tristan da Cunha
  • Average high temperature in December: 24°C

The warmest month (with the highest average high temperature) is March (28°C).
The months with the lowest average high temperature are July, August and September (22°C).

  • Average low temperature in December: 19°C

The month with the highest average low temperature is March (22°C).
The coldest months (with the lowest average low temperature) are July, August and September (17°C).

Average rainfall in December
Jamestown, Saint Helena, Ascension and Tristan da Cunha

Average rainfall in December - Jamestown, Saint Helena, Ascension and Tristan da Cunha
  • Average rainfall in December: 3mm

The wettest month (with the highest rainfall) is March (20mm).
The driest month (with the least rainfall) is November (0mm).

Average rainfall days in December
Jamestown, Saint Helena, Ascension and Tristan da Cunha

Average rainfall days in December - Jamestown, Saint Helena, Ascension and Tristan da Cunha
  • Average rainfall days in December: 1 days

The month with the highest number of rainy days is July (8 days).
The month with the least rainy days is November (0 days).

Average daylight in December
Jamestown, Saint Helena, Ascension and Tristan da Cunha

Average daylight in December - Jamestown, Saint Helena, Ascension and Tristan da Cunha
  • Average daylight in December: 13h and 1min

The month with the longest days is December (Average daylight: 13h and 6min).
The month with the shortest days is June (Average daylight: 11h and 12min).

Jamestown, Saint Helena, Ascension and Tristan da Cunha

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