Climate Chart of Boston, USA

Climate overview

Temperature

Monthly mean temperature is lowest in January, at -1.6 °C, and reaches its high in July, at 23.4 °C. These are averages for each month, not daytime maximum temperatures, so they describe the broader temperature pattern rather than the full range visitors may encounter during a day. The unweighted mean across the monthly means is 10.6 °C. It offers a compact overview of the year, but does not represent a day-weighted annual average or indicate the temperature on a particular visit.

Rain

Mean daily rainfall is lowest in February, at 1.73 mm/day, and highest in October, at 3.82 mm/day. The figures are daily averages for those months, not monthly totals, and they do not show how often rain falls or guarantee dry or wet days. The unweighted mean of the monthly mean daily rainfall figures is 2.81 mm/day. It summarizes the monthly averages, but cannot describe the rainfall expected on any single day.

Snow

Mean daily snowfall is highest in February, at 13.25 mm/day. This is a daily average, not a monthly total, and by itself does not establish the number of snowy days, snow depth, snow cover, or skiing conditions. The unweighted mean of the monthly mean daily snowfall figures is 3.01 mm/day. It summarizes the monthly averages without indicating how snowfall is distributed across individual days.

Sunshine

Mean daily sunshine duration reaches its high in July, at 11.01 hours/day, and its low in December, at 5.07 hours/day. These averages can help frame expectations for outdoor daylight planning, but sunshine duration is not the same as day length. Across the calendar-month means, the unweighted mean daily sunshine duration is 8.08 hours/day. This gives a broad annual reference rather than a prediction for the skies on a given date.