Jamestown
Saint Helena, Ascension and Tristan da Cunha
Long-term weather forecast
Long-term weather forecast

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

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
December, the first month of the summer, in Jamestown, is also a moderately hot month, with average temperature ranging between min 19°C (66.2°F) and max 24°C (75.2°F).

Temperature

In December, the average high-temperature is essentially the same as in November - a still warm 24°C (75.2°F). The average low-temperature, in Jamestown, is 19°C (66.2°F).

Rainfall

Months with rainfall are January through October and December.

Daylight

With an average of 13.1h of daylight, December has the longest days of the year.

What is the temperature in December in Jamestown?

In December, in Jamestown, Saint Helena, Ascension and Tristan da Cunha, the average high-temperature is 24°C (75.2°F), and the average 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 (0.1") of precipitation.

When are the longest days in Jamestown?

With an average of 13.1h of daylight, December has the longest days of the year in Jamestown.

How many hours of daylight does Jamestown have in December?

The average length of the day in December is 13.1h.
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).
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).
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: 3mm

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

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 lowest number of rainy days is November (0 days).

Average daylight in December - Jamestown, Saint Helena, Ascension and Tristan da Cunha
  • Average daylight in December: 13.1h

The month with the longest days is December (Average daylight: 13.1h).
The month with shortest days is June (Average daylight: 11.2h).