The highest day temperature in January 2025 was 39°F. The lowest night temperature was 7°F. The average values for day and night temperatures during January were 26.6°F и 25.4°F respectivly.

The average sea surface temperature in January 2025 for Lahti was 31.2°F. The maximum and minimum values were 30.4°F and 32.2°F respectively.

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

Precipitation total in January for Lahti is 1.7 in.

The average wind speed in January is 7.3 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 Lahti in January is 1.3 hours.