Though weather is just one factor, it can really affect your travel plans, especially if you're planning an extended stay in Greenbush. The hottest months are usually July and August with an average temp of 64°F, while the coldest months are January and February with an average of 25°F. The snowiest months in Greenbush are January, March, December, and February, with each month seeing an average of 9 inches of snowfall.