If you’re hoping to get lost in the rain on your romantic getaway, take a look at these details about year-round temperatures in Durham: 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 -1°C. The snowiest months in Durham are January, February, March and April, with each month seeing an average of 14 cm of snowfall.