When you're planning your escape to Bialowieza, make sure that you take the year-round temperatures into account. The hottest months are usually August and July, with an average temperature of 18°C, while the coldest months are January and February, with an average of -1°C. The snowiest months in Bialowieza are January, December, November and February, with each month seeing an average of 29 cm of snowfall.