Historical weather data, all-time temperature records, and monthly climate averages for Grafton, MA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Grafton sits right on the edge of winter's last stand — average highs of 50° with lows still dipping to freezing. The date has swung wildly over 77 years of records, from a balmy 71° in 2010 to a brutal 12° low in 1995. There's a 1-in-12 chance of snow today, so don't put the scraper away just yet.
Grafton's weather has real teeth at both extremes — from a suffocating 99° in September 1953 to a bone-cracking -19° in January 1957, a range of 118 degrees. The snowiest single day on record, 31.9 inches on January 27, 2015, rivals major blizzard benchmarks, and a single August storm in 1955 dumped 6.38 inches of rain in one day.
Summer peaks mid-July with average highs around 81°, while mid-January bottoms out at a frigid 31° — a nearly 50-degree swing across the year. Late May into early June is the wettest stretch, averaging over an inch of precipitation per week, making it the rainiest time to visit. For the best weather, aim for late June through August; for the worst, brace yourself for January.