If you’re hoping to get lost in the rain on your romantic getaway, take a look at these details about year-round temperatures in Tooele: The hottest months are usually July and August, with an average temperature of 23°C, while the coldest months are January and December, with an average of 0°C. The snowiest months in Tooele are January, April, March and February, with each month seeing an average of 27 cm of snowfall.