Weather is only one factor, but it can really affect your travel plans, especially if you are planning a longer stay in Lawrenceville. 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 -2°C. The snowiest months in Lawrenceville are January, March, December and February, with each month seeing an average of 18 cm of snowfall.