nomadseason

January Weather in Cos Cob, United States

Last updated: June 24, 2025

In January, the average temperature in Cos Cob, United States hovers around 1°C (34°F). Expect a chill, with minimums dipping to -16°C (3°F) and maximums reaching up to 18°C (64°F). The weather tends to be moist, with 69 mm (2.7 in) of precipitation spread over 8 days, contributing to an average humidity of 84%. Remember to bundle up!

January Temperature in Cos Cob

In January in Cos Cob, the average temperature is 1°C (34°F). Maximums can reach 18°C (64°F), while minimums can drop as low as -16°C (3°F). Visitors should be prepared for a wide range of temperatures and pack accordingly to fully enjoy their travels.

January Weather in Cos Cob: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Cos Cob, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Cos Cob, January typically has an average temperature of 1°C (34°F), with highs reaching up to 18°C (64°F) and lows dropping to around -16°C (3°F).
JanFebMarAprMayJunJulAugSepOctNovDec333540506070777569604638
Data source: Temperature data for Cos Cob generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

January Precipitation in Cos Cob

In Cos Cob in January, the precipitation amount is 69 mm (2.7 in) that falls over a period of 8 days.

January Precipitation Trends in Cos Cob

The chart displays monthly precipitation patterns in Cos Cob, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Cos Cob, January typically receives around 69 mm (2.7 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec6910193116112941391189313190114
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

January Humidity in Cos Cob

In Cos Cob in January humidity is 84%. With an average temperature of 1°C (34°F), this humidity feels like a biting chill that seeps into your bones, making travel uncomfortable and requiring extra layers to keep warm while navigating the damp air.

January Average Humidity in Cos Cob

This chart illustrates the average monthly humidity levels in Cos Cob, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Cos Cob is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%81%78%70%69%62%65%68%74%82%80%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Cos Cob

In Cos Cob in January, 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 Cos Cob, you can check the information here.

Maximum UV Index Levels in Cos Cob for January

The chart shows the monthly maximum UV Index (UVI) for Cos Cob in January, 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 January, the maximum UV index in Cos Cob typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35681010998642
Data source: Cos Cob January 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 January Weather in Cos Cob Compares to Other Months

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

This table compares monthly weather conditions in Cos Cob, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)69 mm (2.7 inches)84%moderate
February Weather2°C (36°F)101 mm (4.0 inches)82%moderate
March Weather5°C (41°F)93 mm (3.7 inches)81%high
April Weather10°C (50°F)116 mm (4.6 inches)78%very high
May Weather15°C (60°F)112 mm (4.4 inches)69%very high
June Weather21°C (70°F)93 mm (3.7 inches)69%very high
July Weather25°C (77°F)139 mm (5.5 inches)62%very high
August Weather24°C (75°F)118 mm (4.6 inches)65%very high
September Weather21°C (69°F)93 mm (3.6 inches)68%very high
October Weather15°C (60°F)131 mm (5.2 inches)74%high
November Weather8°C (47°F)90 mm (3.6 inches)82%moderate
December Weather3°C (39°F)113 mm (4.5 inches)80%low

Compare Cos Cob's Climate with Cities Worldwide