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December Weather in Stamford, United States

Last updated: June 24, 2025

In December, the average temperature in Stamford, United States is a cool 9°C (49°F), with extremes ranging from a chilly -5°C (22°F) to a warm 31°C (89°F). Expect approximately 25 mm (1.0 in) of precipitation over 3 days, contributing to a high average humidity of 85%. Embrace the unique climate of Stamford this season!

December Temperature in Stamford

In December in Stamford, the average temperature is 9°C (49°F). Maximums can reach 31°C (89°F) and minimums can be as low as -5°C (22°F). Be prepared for a wide range of temperatures and pack accordingly for your travels.

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

The chart illustrates December temperature patterns in Stamford, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Stamford, December typically has an average temperature of 9°C (49°F), with highs reaching up to 31°C (89°F) and lows dropping to around -5°C (22°F).
JanFebMarAprMayJunJulAugSepOctNovDec454759657583868578665549
Data source: Temperature data for Stamford 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 Stamford

In Stamford in December, the precipitation amount is 25 mm (1.0 in) over the course of 3 days.

December Precipitation Trends in Stamford

The chart displays monthly precipitation patterns in Stamford, 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 Stamford, December typically receives around 25 mm (1.0 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec282649667960324487673225
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Stamford

In Stamford in December humidity is 85%. With an average temperature of 9°C (49°F), this humidity feels like a damp chill that seeps into your bones, making every step outside a challenge as the moisture in the air weighs heavily and lingers, transforming even simple outings into a quest for comfort.

December Average Humidity in Stamford

This chart illustrates the average monthly humidity levels in Stamford, 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 Stamford is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec77%76%74%75%80%80%75%67%64%70%82%85%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Stamford

In Stamford in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Stamford for better planning.

Maximum UV Index Levels in Stamford for December

The chart shows the monthly maximum UV Index (UVI) for Stamford 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 Stamford typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec479101112121110864
Data source: Stamford 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 Stamford Compares to Other Months

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

This table compares monthly weather conditions in Stamford, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (45°F)28 mm (1.1 inches)77%moderate
February Weather8°C (47°F)26 mm (1.0 inches)76%high
March Weather15°C (60°F)49 mm (1.9 inches)74%very high
April Weather18°C (65°F)66 mm (2.6 inches)75%very high
May Weather24°C (75°F)79 mm (3.1 inches)80%extreme
June Weather28°C (83°F)60 mm (2.4 inches)80%extreme
July Weather30°C (86°F)31 mm (1.2 inches)75%extreme
August Weather29°C (85°F)44 mm (1.7 inches)67%extreme
September Weather26°C (78°F)87 mm (3.4 inches)64%very high
October Weather19°C (66°F)67 mm (2.6 inches)70%very high
November Weather13°C (55°F)32 mm (1.3 inches)82%high
December Weather9°C (49°F)25 mm (1.0 inches)85%moderate

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