Weather is only one factor, but it can really affect your travel plans, especially when you are planning a longer stay in Big Bear City. The hottest months are usually July and August, with an average temperature of 23°C, while the coldest months are February and December, with an average of 8°C. The snowiest months in Big Bear City are February, March, January and May, with each month seeing an average of 25 cm of snowfall.