Boston Temperature by Month

Boston, Lincolnshire, United Kingdom has an average annual maximum temperature of 15°C (59°F), ranging from 8°C (46°F) in January to 22°C (72°F) in July. Below you'll find a full monthly breakdown and a comparison with cities worldwide.

In Boston, temperatures can shift dramatically between warm in summer and cold in winter. Nights follow the same pattern, with lows ranging from 13°C (55°F) in July to 2°C (36°F) in January.

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

Low temperatures are most often recorded between 4 AM and 6 AM, while highs typically occur around 3 PM. July, the city's warmest month, sees 207 hours of sunshine.

The chart below shows the average temperature throughout the year:

Boston's average annual maximum temperature is 15°C (59°F). To put that in context, here's how it compares to a few well-known destinations:

Seville, Spain averages 23°C (73°F) a year, one of the warmer cities in Western Europe, with long hot summers.

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.

Brisbane, Australia averages 26°C (79°F) a year, with warm winters and hot, humid summers.

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.

Global average temperatures have risen by around 1.2°C since the pre-industrial era, and the effects are visible across many regions. Winters are milder on average, with fewer frost days and less snow in many parts of the world. Heatwaves are more frequent and more intense, and Europe's summers of 2018, 2019, and 2020 all set records.

Summers are also getting drier in some areas, while winter rainfall has increased in others. This contributies to higher river levels and more flooding. In many countries, spring arrives earlier and autumn lasts longer. It has knock-on effects for wildlife, agriculture, and local ecosystems.

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