If you're looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Crossville: The hottest months are usually July and August, with an average temperature of 22°C, while the coldest months are January and February, with an average of 5°C. The rainiest months in Crossville are July, April, August and December, with each month seeing an average of 180 mm of rainfall.