Weather will likely play an important role when you plan your trip to Barnaul, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually July and June, with an average temperature of 18°C, while the coldest months are January and February, with an average of -12°C. The snowiest months in Barnaul are March, February, January and December, with each month seeing an average of 129 cm of snowfall.