If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Blackfoot: The hottest months are usually July and August, with an average temperature of 20°C, while the coldest months are January and December, with an average of -3°C. The snowiest months in Blackfoot are January, March, April and November, with each month seeing an average of 34 cm of snowfall.