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 Arcadia: The hottest months are usually August and July, with an average temperature of 18°C, while the coldest months are February and January, with an average of -2°C. The snowiest months in Arcadia are January, November, March and February, with each month seeing an average of 39 cm of snowfall.