December Weather in Middlesex, United States

Last updated: June 24, 2025

In December, the average temperature in Middlesex, United States hovers around 8°C (47°F), but be prepared for temperature swings—ranging from a frosty -9°C (17°F) to a warm 24°C (76°F). With 105 mm (4.1 in) of precipitation spread over 9 days, it's wise to carry an umbrella. The air will feel quite damp, with an average humidity of 86%, giving you that typical brisk feel of the season.

December Temperature in Middlesex

In December in Middlesex, the average temperature is 8°C (47°F). Maximums can reach 24°C (76°F), while minimums can drop as low as -9°C (17°F). Be prepared for a wide range of temperatures if you plan to travel during this time.

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

The chart illustrates December temperature patterns in Middlesex, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Middlesex, December typically has an average temperature of 8°C (47°F), with highs reaching up to 24°C (76°F) and lows dropping to around -9°C (17°F).

Data source: Temperature data for Middlesex generated using information from the Copernicus Climate Change Service.

December Precipitation in Middlesex

In Middlesex in December, the total precipitation amount reaches 105 mm (4.1 in) over the course of 9 days.

December Precipitation Trends in Middlesex

The chart displays monthly precipitation patterns in Middlesex, 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 Middlesex, December typically receives around 105 mm (4.1 inches) of precipitation spread over approximately 9 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

December Humidity in Middlesex

In Middlesex in December, humidity is 86%. With an average temperature of 8°C (47°F), this humidity feels like a chilling damp that penetrates your clothes, making outdoor adventures less enjoyable and encouraging you to seek warmth indoors rather than explore the sights.

December Average Humidity in Middlesex

This chart illustrates the average monthly humidity levels in Middlesex, 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 Middlesex is approximately 86%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Middlesex

In Middlesex in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Middlesex, you can check the information here.

Maximum UV Index Levels in Middlesex for December

The chart shows the monthly maximum UV Index (UVI) for Middlesex 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 Middlesex typically reaches 3, which falls under the moderate exposure category.

Data source: Middlesex 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 Middlesex Compares to Other Months

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

This table compares monthly weather conditions in Middlesex, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	6°C (44°F)	92 mm (3.6 inches)	85%	moderate
February Weather	9°C (49°F)	98 mm (3.8 inches)	82%	high
March Weather	12°C (53°F)	77 mm (3.0 inches)	81%	very high
April Weather	17°C (63°F)	110 mm (4.3 inches)	80%	very high
May Weather	22°C (71°F)	121 mm (4.7 inches)	81%	very high
June Weather	25°C (77°F)	136 mm (5.4 inches)	81%	extreme
July Weather	27°C (81°F)	126 mm (5.0 inches)	81%	extreme
August Weather	26°C (79°F)	158 mm (6.2 inches)	80%	very high
September Weather	24°C (75°F)	134 mm (5.3 inches)	79%	very high
October Weather	19°C (66°F)	79 mm (3.1 inches)	80%	very high
November Weather	11°C (52°F)	85 mm (3.4 inches)	85%	moderate
December Weather	8°C (47°F)	105 mm (4.1 inches)	86%	moderate