Saint Johnsbury (VT) Temperature by Month

Saint Johnsbury, Vermont, United States of America has an average annual maximum temperature of 12°C (54°F), ranging from -3°C (27°F) in January to 26°C (79°F) in July. Below you'll find a full monthly breakdown and a comparison with cities worldwide.

In Saint Johnsbury, temperatures differ significantly between summer and winter months. Nighttime lows reflect this range, dropping from 14°C (57°F) in July to -14°C (7°F) in January.

The chart below illustrates the average maximum day and minimum night temperatures in Saint Johnsbury by month:

Daily lows are most common between 4 AM and 6 AM. By 3 PM temperatures reach their daily high, driven by peak solar heating.

The chart below shows the average temperature throughout the year:

Saint Johnsbury's average annual maximum temperature is 12°C (54°F). To put that in context, here's how it compares to a few well-known destinations:

Athens, Greece sits at 23°C (73°F) on average, with hot dry summers and mild winters characteristic of the Mediterranean.

Reykjavík, Iceland averages 9°C (48°F) a year, mild summers by Icelandic standards, but cold winters and frequent wind.

New York City, USA averages 17°C (63°F) a year, with hot humid summers and cold winters that bring regular snowfall.

Tokyo, Japan averages 21°C (70°F) a year, with hot summers, cool winters, and a well-defined cherry blossom spring.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

Seasonal temperature shifts influence more than just how warm it feels, they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.

Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Saint Johnsbury this rarely lasts long on the ground.

For more on Saint Johnsbury's weather, including monthly rainfall, sunshine hours, and humidity, visit our Saint Johnsbury climate page.