Weather can make or break a road trip, so we've gathered some data about year-round temperatures in Kostanay to help you plan yours. The hottest months are usually July and August, with an average temperature of 19°C, while the coldest months are January and February, with an average of -12°C. The snowiest months in Kostanay are January, March, February and December, with each month seeing an average of 159 cm of snowfall.