Historical weather data, all-time temperature records, and monthly climate averages for Dedham, MA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Dedham runs cold, with an average high of just 50° and a low dipping to 33°—still firmly in late-winter territory. The date has seen wild swings over 141 years of records, from a balmy 76° in 2010 to a brutal 12° low back in 1954. There's a 43% chance of rain today, with a lingering 8% shot at snow.
Dedham's weather has some serious bite to it: the mercury has swung from a suffocating 101° in August 1949 all the way down to -21° in February 1934—a range of 122 degrees. A single day in August 1955 dropped 8.07 inches of rain, and a February 1969 snowstorm buried the area under 27.4 inches in one shot.
Summer is the sweet spot, with the warmest week of the year running July 16–22 at an average high of 81°. Winters are genuinely cold—early January averages just 33° for a high—so plan accordingly if you're visiting between December and March. The wettest stretch of the year lands at Christmas, with the final week of December averaging 1.18 inches of precipitation.