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December Weather in Lowell, United States

Last updated: June 24, 2025

In December, the average temperature in Lowell, United States hovers around 4°C (40°F). Expect a chill, with minimums dipping as low as -8°C (18°F), while maximums can reach up to a pleasant 19°C (66°F). Don't forget your umbrella, as 216 mm (8.5 in) of precipitation is expected over 19 days. The air will be quite humid, with an average humidity level of 87%—perfect for a cozy indoor retreat!

December Temperature in Lowell

In December in Lowell, the average temperature is 4°C (40°F). Maximums can reach 19°C (66°F), while minimums can drop as low as -8°C (18°F). Be prepared for a wide range of temperatures if you're planning to travel during this time.

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

The chart illustrates December temperature patterns in Lowell, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lowell, December typically has an average temperature of 4°C (40°F), with highs reaching up to 19°C (66°F) and lows dropping to around -8°C (18°F).
JanFebMarAprMayJunJulAugSepOctNovDec403943485561686962514439
Data source: Temperature data for Lowell 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 Lowell

In Lowell in December, the precipitation amount is 216 mm (8.5 in) during a total of 19 days.

December Precipitation Trends in Lowell

The chart displays monthly precipitation patterns in Lowell, 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 Lowell, December typically receives around 216 mm (8.5 inches) of precipitation spread over approximately 19 days.
JanFebMarAprMayJunJulAugSepOctNovDec189241169175855738101133179216
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Lowell

In Lowell in December humidity is 87%. With an average temperature of 4°C (40°F), this humidity feels like an uncomfortable chill that seeps into your bones, making it essential to dress warmly and prepare for damp conditions, which can dampen your spirits while traveling.

December Average Humidity in Lowell

This chart illustrates the average monthly humidity levels in Lowell, 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 Lowell is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%85%86%83%83%83%78%67%66%77%87%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Lowell

In Lowell 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 Lowell, you can visit Hourly UV Index in Lowell.

Maximum UV Index Levels in Lowell for December

The chart shows the monthly maximum UV Index (UVI) for Lowell 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 Lowell typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec246710101098532
Data source: Lowell 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 Lowell Compares to Other Months

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

This table compares monthly weather conditions in Lowell, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (40°F)189 mm (7.4 inches)84%low
February Weather4°C (39°F)241 mm (9.5 inches)85%moderate
March Weather6°C (43°F)169 mm (6.6 inches)86%high
April Weather9°C (49°F)175 mm (6.9 inches)83%high
May Weather13°C (55°F)85 mm (3.3 inches)83%very high
June Weather16°C (62°F)57 mm (2.2 inches)83%very high
July Weather20°C (68°F)3 mm (0.1 inches)78%very high
August Weather20°C (69°F)8 mm (0.3 inches)67%very high
September Weather17°C (62°F)101 mm (4.0 inches)66%very high
October Weather11°C (51°F)133 mm (5.2 inches)77%moderate
November Weather7°C (45°F)179 mm (7.1 inches)87%moderate
December Weather4°C (40°F)216 mm (8.5 inches)87%low

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