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.

Anyone planning to live, garden, or travel in Saint Johnsbury should weigh precipitation alongside temperature: the annual average runs 39.3 inches, with seasonal snowfall possible. The frost-free season averages 146 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near May 10 and the first fall freeze near October 3. And on the energy front, 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 54/100 (Moderate), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. The monthly tables above are the practical planning tool: mild highs and lows land in the shoulder seasons, July-driven heat peaks in summer, and January-driven cold sets in over deep winter. These are thirty-year averages, not a forecast - any single year can run warmer, wetter, drier, or cooler than the normal.