Lewiston, ME Climate

Climate Insight: Lewiston, ME

Based on station USC00174566 feeding NOAA's 1991–2020 climate normals, Lewiston, Maine averages 46°F a year, ranging from a mean daily high of 55°F to a mean daily low of 38°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. Lewiston sees about 45.2 inches of precipitation a year, with 65.1 inches typically falling as snow. The frost-free season averages 177 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near April 25 and the first fall freeze near October 19. On the energy side, 7,271 heating degree days and 485 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.

On PlainClimate's composite comfort index, Lewiston scores 54/100 (Moderate), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. Shoulder seasons bring the mildest highs and lows in the monthly tables above, summer brings July-driven heat, and winter brings January-driven cold - use that rhythm for planning. These figures are thirty-year averages rather than forecasts, so a specific year may still run warmer, cooler, wetter, or drier than what's shown.