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December Weather in Londonderry, United States

Last updated: June 24, 2025

In Londonderry, United States, the average temperature in December hovers around -4°C (26°F), with potential extremes ranging from a minimum of -25°C (-12°F) to a maximum of 14°C (57°F). Expect 105 mm (4.1 in) of precipitation spread over 10 days, and a notable average humidity of 84%. Prepare for a chilly and damp month!

December Temperature in Londonderry

In December in Londonderry, the average temperature is -4°C (26°F), with maximums reaching 14°C (57°F) and minimums dropping as low as -25°C (-12°F). Be sure to pack warm clothing if you're traveling during this time!

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

The chart illustrates December temperature patterns in Londonderry, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Londonderry, December typically has an average temperature of -4°C (26°F), with highs reaching up to 14°C (57°F) and lows dropping to around -25°C (-12°F).
JanFebMarAprMayJunJulAugSepOctNovDec212430435564696760493425
Data source: Temperature data for Londonderry 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 Londonderry

In Londonderry in December, the precipitation amount is 105 mm (4.1 in) over the course of 10 days.

December Precipitation Trends in Londonderry

The chart displays monthly precipitation patterns in Londonderry, 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 Londonderry, December typically receives around 105 mm (4.1 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec78917813110311416312095157107105
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Londonderry

In Londonderry in December, humidity is 84%. With an average temperature of -4°C (26°F), this humidity feels like a biting cold that seeps through your layers, making outdoor activities brisk and invigorating but challenging for sustained exploration.

December Average Humidity in Londonderry

This chart illustrates the average monthly humidity levels in Londonderry, 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 Londonderry is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%88%86%84%76%72%67%64%72%81%87%85%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Londonderry

In Londonderry in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Londonderry, you can visit Hourly UV Index in Londonderry.

Maximum UV Index Levels in Londonderry for December

The chart shows the monthly maximum UV Index (UVI) for Londonderry 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 Londonderry typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34681010997632
Data source: Londonderry 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 Londonderry Compares to Other Months

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

This table compares monthly weather conditions in Londonderry, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (21°F)78 mm (3.1 inches)89%moderate
February Weather-5°C (24°F)91 mm (3.6 inches)88%moderate
March Weather-1°C (31°F)78 mm (3.1 inches)86%high
April Weather6°C (43°F)131 mm (5.2 inches)84%very high
May Weather13°C (55°F)103 mm (4.0 inches)76%very high
June Weather18°C (64°F)114 mm (4.5 inches)72%very high
July Weather21°C (69°F)163 mm (6.4 inches)66%very high
August Weather20°C (67°F)120 mm (4.7 inches)64%very high
September Weather16°C (61°F)95 mm (3.7 inches)72%high
October Weather9°C (49°F)157 mm (6.2 inches)81%high
November Weather1°C (35°F)107 mm (4.2 inches)87%moderate
December Weather-4°C (26°F)105 mm (4.1 inches)84%low

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