Our weather and climate analysis offers a detailed understanding of average weather patterns for locations across the globe. Derived from 26 years of historical simulated weather data from ECMWF, it provides valuable insights into typical weather conditions, including air temperature, humidity, precipitation, cloud cover and wind. It is important to note the data is not observational, but rather derived from climate reanalysis.
Our database was last updated in January 2026, and current weather and climate guides are derived from an hourly dataset spanning 26 years (2000 to 2025). Our database contain modified Copernicus Climate Change Service information for these years. Refer to our Terms for full acknowledgements and disclaimers.
All content on this website is property of WeatherBox and must not be reproduced without permission. The only exception is our data tables which are shared under CC BY-SA 4.0. You may reproduce data tables provided you include full attribution to WeatherBox. Refer to our Terms for full conditions.
The content on this site is offered "as is," with no guarantees regarding its accuracy or appropriateness for any use. We are not liable for any decisions made on the basis of the content presented on this site. This website is not affiliated with, endorsed by, or sponsored by any of the locations or organizations mentioned. Refer to our Terms for full disclaimer.
United States > Boston, MA > Overview
Discover if upcoming months are expected to be warmer, colder, wetter, or drier than average
What is the best time to visit Boston to enjoy the optimal weather conditions?
This quick reference weather table contains a summary of the annual climate trends in Boston. It contains key metrics, including average monthly high & low temperatures, rainfall, humidity and UV index. The data is presented on a monthly basis, allowing you to see how each these weather components change throughout the year.
Explore the most extreme weather events in Boston over the past 26 years, including record highs and lows for temperatures, rainfall, and wind speeds. This data is sourced from the latest ERA5 reanalysis model spanning 2000 to 2025.
Explore weather patterns in areas close to Boston, United States
Explore places with similar climates and weather patterns to Boston, United States
Use our Climate Finder to search locations by their temperature and humidity patterns.
Weather guides, climate insights, and travel planning stories that talk about Boston.
Boston features a distinct continental climate marked by sharp seasonal contrasts and significant annual variation. WeatherBox data shows that average temperatures fluctuate by 23.6°C (42.5°F) between the yearly extremes. Winters are consistently cold, with daily lows averaging -4.5°C (23.9°F) during the coldest month. Conversely, summers are defined by intense warmth, where daily highs average 26.3°C (79.3°F). While the city is prone to occasional extremes, the temperature rarely falls below -12.5°C (9.5°F) or exceeds 30.6°C (87.1°F).
Precipitation is a constant factor year-round, totaling 1,170 mm (46 in) annually. December is typically the wettest month, accumulating 117 mm (5 in), while the driest month, July, still records 86 mm (3 in). Humidity creates muggy conditions in late summer, with relative humidity peaking at 76.2 in September. Solar exposure correlates strongly with the temperature changes; the area experiences abundant sunshine totaling 290.1 hours in July, contrasting sharply with the darker winter days of December, which average only 111.1 hours of sun.
Air movement and solar intensity also shift dramatically depending on the season. Prevailing winds blow from the SW, with average speeds reaching 16.6 km/h (10.3 mph) in January. These blustery winds rarely exceed 33.6 km/h (20.9 mph), but they contribute significantly to the winter chill. During the warmer months, the average peak UV Index is 6.4, indicating high solar strength. Explore the interactive weather charts on WeatherBox to visualize these climate patterns in greater detail.