Planning for the weather is a good way to make your trip to Rigby relaxing and enjoyable, especially when you’re splurging. The hottest months are usually July and August, with an average temperature of 19°C, while the coldest months are January and December, with an average of -4°C. The snowiest months in Rigby are January, February, March and December, with each month seeing an average of 31 cm of snowfall.