You'll likely spend much of your trip indoors, but if you're planning to venture beyond the casino, looking at local weather trends is a good idea. The hottest months are usually July and August, with an average temperature of 17°C, while the coldest months are January and February, with an average of -1°C. The snowiest months in Birstonas are January, December, February and November, with each month seeing an average of 24 cm of snowfall.