If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Asansol: The hottest months are usually April and May, with an average temperature of 31°C, while the coldest months are January and December, with an average of 21°C. The rainiest months in Asansol are July, August, September and June, with each month seeing an average of 289 mm of rainfall.