Although weather is just one factor, it can really affect your travel plans, especially if you are planning a longer stay in Farmington. The hottest months are usually July and August, with an average temperature of 23°C, while the coldest months are January and February, with an average of 0°C. The snowiest months in Farmington are January, December, November and February, with each month seeing an average of 15 cm of snowfall.