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December Weather in Georgetown, Saint Helena, Ascension and Tristan da Cunha

Last updated: August 31, 2025

In Georgetown, Saint Helena, Ascension and Tristan da Cunha, the average temperature in December is a pleasant 24°C (76°F), with a minimum of 23°C (74°F) and a maximum of 26°C (79°F). Expect a bit of rain, with an average precipitation amount of 12 mm (0.5 in) over the course of 1 day. The atmosphere is relatively humid, boasting an average humidity of 80%, making the air feel warm and inviting.

December Temperature in Georgetown

In December in Georgetown, the average temperature is 24°C (76°F). The maximum can reach 26°C (79°F), and the minimum can be as low as 23°C (74°F). This pleasant climate makes it a great destination for travelers seeking mild weather and outdoor activities.

December Weather in Georgetown: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Georgetown, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Georgetown, December typically has an average temperature of 24°C (76°F), with highs reaching up to 26°C (79°F) and lows dropping to around 23°C (74°F).
JanFebMarAprMayJunJulAugSepOctNovDec777980808078767574757576
Data source: Temperature data for Georgetown generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Georgetown

In Georgetown in December, the precipitation amount is 12 mm (0.5 in) over the course of 1 day.

December Precipitation Trends in Georgetown

The chart displays monthly precipitation patterns in Georgetown, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Georgetown, December typically receives around 12 mm (0.5 inches) of precipitation spread over approximately 1 days.
JanFebMarAprMayJunJulAugSepOctNovDec91516211414171919151112
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Georgetown

In Georgetown in December humidity is 80%. With an average temperature of 24°C (76°F), this humidity feels like a warm, sticky embrace that can make exploring outdoors quite draining, so it's essential to stay hydrated and take breaks in the shade while traveling.

December Average Humidity in Georgetown

This chart illustrates the average monthly humidity levels in Georgetown, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Georgetown is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%80%79%80%85%81%79%79%80%80%80%80%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Georgetown

In Georgetown in December, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in Georgetown, you can check here.

Maximum UV Index Levels in Georgetown for December

The chart shows the monthly maximum UV Index (UVI) for Georgetown in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Georgetown typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec141414131210101112131414
Data source: Georgetown December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How December Weather in Georgetown Compares to Other Months

Weather in Georgetown varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Georgetown, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Georgetown, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather25°C (77°F)9 mm (0.3 inches)82%extreme
February Weather26°C (79°F)15 mm (0.6 inches)80%extreme
March Weather27°C (80°F)16 mm (0.6 inches)79%extreme
April Weather27°C (81°F)21 mm (0.8 inches)80%extreme
May Weather26°C (80°F)14 mm (0.6 inches)85%extreme
June Weather26°C (78°F)14 mm (0.6 inches)81%very high
July Weather25°C (77°F)17 mm (0.7 inches)79%very high
August Weather24°C (75°F)19 mm (0.8 inches)79%extreme
September Weather24°C (75°F)19 mm (0.7 inches)80%extreme
October Weather24°C (75°F)15 mm (0.6 inches)80%extreme
November Weather24°C (76°F)11 mm (0.4 inches)80%extreme
December Weather24°C (76°F)12 mm (0.5 inches)80%extreme

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