If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Arc-2000: The hottest months are usually July and August with an average temp of 55°F, while the coldest months are January and February with an average of 26°F. The rainiest months in Arc-2000 are May, December, November, and January, with each month seeing an average of 7 inches of rainfall.