Dedham, MA Climate


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United States / Massachusetts / Boston-Cambridge-Newton Metro Area / Norfolk County / Dedham / Zip Codes
Dedham, MA has a humid continental climate with four distinct seasons. Summers are warm and humid, with temperatures averaging in the mid-70s. Winters are cold and snowy with temperatures typically ranging between 20-35 degrees Fahrenheit. Spring and fall are milder, but occasionally experience temperature extremes. The average annual snowfall is about 40 inches, making Dedham a great place for winter recreation such as skiing and snowboarding. Rainfall averages around 45 inches annually. Dedham also experiences occasional thunderstorms and hail during the summer months.

Dedham, Massachusetts gets 49 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Dedham averages 47 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 201 sunny days per year in Dedham. The US average is 205 sunny days.

Dedham gets some kind of precipitation, on average, 127 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.

Weather Highlights

Summer High: the July high is around 83 degrees
Winter Low: the January low is 18
Rain: averages 49 inches of rain a year
Snow: averages 47 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Dedham is 7.0 (10=best), which means it is more comfortable than most places in Massachusetts.

9.2 Summer - 4.9 Winter
August, June and July are the most pleasant months in Dedham, while January and February are the least comfortable months.

  ClimateDedham, MassachusettsUnited States
  48.6 in.38.1 in.
  46.7 in.27.8 in.
  126.7 days106.2 days
  201 days205 days
  83.1°85.8°
  17.5°21.7°
  77
  3.54.3
  108 ft.2443 ft.
Climate
YOU SHOULD KNOW

Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

July is the hottest month for Dedham with an average high temperature of 83.1°, which ranks it as warmer than most places in Massachusetts. In Dedham, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Dedham are June, August and September.
In Dedham, there are 11.4 days annually when the high temperature is over 90°, which is hotter than most places in Massachusetts.
January has the coldest nighttime temperatures for Dedham with an average of 17.5°. This is about average compared to other places in Massachusetts.
In Dedham, there are 132.7 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Massachusetts.
In Dedham, there are 3.1 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Massachusetts.
The humidity is usually comfortable in Dedham but some summer days can be muggy. July is the most humid month, though it is still relatively mild compared to many other places. The most humid months are July, August and June.
March is the wettest month in Dedham with 4.6 inches of rain, and the driest month is February with 3.5 inches. The wettest season is Summer with 26% of yearly precipitation and 24% occurs in Spring, which is the driest season. The annual rainfall of 48.6 inches in Dedham means that it is wetter than most places in Massachusetts.
May is the rainiest month in Dedham with 12.2 days of rain, and September is the driest month with only 8.8 rainy days. There are 126.7 rainy days annually in Dedham, which is about average compared to other places in Massachusetts. The rainiest season is Summer when it rains 27% of the time and the driest is Winter with only a 23% chance of a rainy day.
An annual snowfall of 46.7 inches in Dedham means that it is snowier than most places in Massachusetts. January is the snowiest month in Dedham with 13.7 inches of snow, and 6 months of the year have significant snowfall.
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