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 Galena: The hottest months are usually July and August, with an average temperature of 21°C, while the coldest months are January and February, with an average of -3°C. The snowiest months in Galena are January, December, March and November, with each month seeing an average of 25 cm of snowfall.