Barter Island Temperature by Month
Barter Island in United States of America sees significant seasonal temperature differences, with daytime highs between -19°C (-2°F) in January and 7°C (45°F) in July, averaging -6°C (21°F) annually. Explore the full monthly breakdown below.
Barter Island Monthly Temperatures
In Barter Island, temperatures differ significantly between summer and winter months. Nighttime lows reflect this range, dropping from 3°C (37°F) in July to -24°C (-11°F) in January.
The chart below illustrates the average maximum day and minimum night temperatures in Barter Island by month:
Low temperatures are most often recorded between 4 AM and 6 AM, while highs typically occur around 3 PM.
The chart below shows the average temperature throughout the year:
Temperature: Barter Island vs the United States of America
The map below shows the annual temperature across the United States of America. You can also select individual months if you want to compare a specific time of year.
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Barter Island vs World: Temperature Compared
Barter Island's average annual maximum temperature is -6°C (21°F). To put that in context, here's how it compares to a few well-known destinations:
Lisbon, Portugal averages 21°C (70°F) annually — warm summers, mild winters, and rain mainly in the cooler months.
Glasgow, Scotland averages 13°C (55°F) a year — mild but often grey, with cold winters and rarely hot summers.
San Francisco, USA averages 19°C (66°F) annually, but with little seasonal variation — summers are often cool and foggy, winters mild.
Perth, Australia averages 25°C (77°F) annually, with a classic Mediterranean climate — hot dry summers and mild wet winters.
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 Barter Island this rarely lasts long on the ground.
For more on Barter Island's weather — including monthly rainfall, sunshine hours, and humidity — visit our Barter Island climate page.
