Birch Hill Dam, MA Climate

Climate Insight: Birch Hill Dam, MA

Based on station USC00190666 feeding NOAA's 1991–2020 climate normals, Birch Hill Dam, Massachusetts averages 46°F a year, ranging from a mean daily high of 57°F to a mean daily low of 35°F. July is typically the warmest month of the year, while January is the coldest. Because these figures are thirty-year averages rather than any single year's readings, they describe the typical month, not a forecast for it.

Rainfall (and snow, where it falls) shapes day-to-day life here as much as temperature does. Birch Hill Dam sees about 48.6 inches of precipitation a year, with 50.9 inches typically falling as snow. The frost-free season averages 148 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near May 6 and the first fall freeze near October 1. On the energy side, 7,234 heating degree days and 445 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.

On PlainClimate's composite comfort index, Birch Hill Dam scores 54/100 (Moderate), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. Use the monthly tables above to plan around specific windows, shoulder seasons for mild highs and lows, peak summer for July-driven heat, or deep winter for January-driven cold. All figures here are thirty-year averages: any single year may run warmer, wetter, drier, or cooler than the normal, so treat them as planning guidance rather than forecasts.