Saint Johnsbury, VT Climate

Climate Insight: Saint Johnsbury, VT

The NOAA 1991–2020 climate normals describe Saint Johnsbury, Vermont as a location with an annual average temperature of 44°F, ranging from a mean daily high of 54°F to a mean daily low of 34°F. July is typically the warmest month of the year, while January is the coldest. These thirty-year averages, computed from 2 weather stations, smooth out year-to-year variability and give a baseline expectation for typical conditions in any given month.

Precipitation patterns matter as much as temperature for anyone planning to live, garden, or travel here. Saint Johnsbury receives roughly 39.3 inches of precipitation each year, with seasonal snowfall possible. Growing-season length varies with elevation and microclimate, with the last spring freeze near May 10 and the first fall freeze near October 3. For energy use, 7,983 heating degree days and 330 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.

On PlainClimate's composite comfort index, Saint Johnsbury scores 57/100 (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.