January Weather in Sumy, Ukraine

Last updated: August 28, 2025

In January, the average temperature in Sumy, Ukraine hovers around -4°C (25°F). However, be prepared for a chill, as temperatures can plunge to a minimum of -27°C (-16°F), while occasionally reaching a maximum of 7°C (45°F). With an average precipitation of 43 mm (1.7 in) over 9 days, and a notable average humidity of 92%, it's wise to bundle up and stay prepared for the elements!

January Temperature in Sumy

In January in Sumy, the average temperature is -4°C (25°F). Maximum temperatures can reach 7°C (45°F), while minimums can drop as low as -27°C (-16°F). Travelers should be prepared for very cold conditions and pack accordingly to ensure comfort during their stay.

January Weather in Sumy: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Sumy, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sumy, January typically has an average temperature of -4°C (25°F), with highs reaching up to 7°C (45°F) and lows dropping to around -27°C (-16°F).

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

January Precipitation in Sumy

In Sumy in January, the precipitation amount reaches 43 mm (1.7 in) over the course of 9 days.

January Precipitation Trends in Sumy

The chart displays monthly precipitation patterns in Sumy, 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 Sumy, January typically receives around 43 mm (1.7 inches) of precipitation spread over approximately 9 days.

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

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Millimeters (mm) Inches (in)

January Humidity in Sumy

In Sumy in January, humidity is 92%. With an average temperature of -4°C (25°F), this humidity feels like stepping into a frosty cloud, making it challenging for travelers as the cold air clings to the skin and enhances the chill, requiring extra layers to stay warm while exploring.

January Average Humidity in Sumy

This chart illustrates the average monthly humidity levels in Sumy, 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 Sumy is approximately 92%, offering insight into how humid the weather typically is during this month.

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

January UV Index in Sumy

In Sumy in January, 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 Sumy, you can visit Hourly UV Index in Sumy.

Maximum UV Index Levels in Sumy for January

The chart shows the monthly maximum UV Index (UVI) for Sumy 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 Sumy typically reaches 2, which falls under the low exposure category.

Data source: Sumy 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 Sumy Compares to Other Months

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

This table compares monthly weather conditions in Sumy, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (25°F)	43 mm (1.7 inches)	92%	low
February Weather	-3°C (26°F)	45 mm (1.8 inches)	93%	low
March Weather	1°C (35°F)	40 mm (1.6 inches)	90%	moderate
April Weather	9°C (48°F)	40 mm (1.6 inches)	79%	moderate
May Weather	15°C (59°F)	64 mm (2.5 inches)	66%	high
June Weather	20°C (68°F)	58 mm (2.3 inches)	65%	very high
July Weather	21°C (69°F)	84 mm (3.3 inches)	55%	very high
August Weather	21°C (69°F)	28 mm (1.1 inches)	49%	high
September Weather	15°C (60°F)	39 mm (1.5 inches)	69%	high
October Weather	9°C (49°F)	36 mm (1.4 inches)	84%	moderate
November Weather	2°C (36°F)	37 mm (1.4 inches)	92%	low
December Weather	-1°C (30°F)	69 mm (2.7 inches)	94%	low