If you're looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Tomsk: The hottest months are usually July and June, with an average temperature of 15°C, while the coldest months are January and February, with an average of -14°C. The snowiest months in Tomsk are March, February, April and December, with each month seeing an average of 256 cm of snowfall.