The highest day temperature in January 2025 was 47°F. The lowest night temperature was 18°F. The average values for day and night temperatures during January were 35.3°F и 31.6°F respectivly.

Most of the days in January are gloomy but you can also expect sunny days.

Precipitation total in January for Sumy is 1.8 in.

The average wind speed in January is 9.1 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Sumy in January is 1.8 hours.