Planning for the weather is a good way to make your trip to Farmington 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 February, with an average of 0°C. The snowiest months in Farmington are January, December, February and November, with each month seeing an average of 77 cm of snowfall.