Historical weather data, all-time temperature records, and monthly climate averages for Union Square, MA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Union Square sits in that classic New England in-between: a 53° average high that could pass for a pleasant spring day or a disappointing one depending on your expectations. The date has swung wildly over 90 years of records, from a balmy 75° in 1991 to a teeth-chattering 20° low in 1995. There's a 38% chance of rain today, with a small but real 6% shot at snow.
Union Square has seen it all — from a suffocating 103° on July 22, 2011 to a brutal -14° on February 15, 1943, a swing of 117 degrees across its recorded history. The wettest single day on record dumped 7.06 inches in August 1955, while a January 2022 storm buried the area under 23.6 inches of snow in a single day.
Summer peaks in the third week of July with average highs around 83°, making mid-July through mid-August the window for warm-weather plans. Winter bottoms out in the third week of January, when highs average just 35°. If you're trying to dodge rain, avoid mid-March — it's the wettest stretch of the year, averaging 1.1 inches of precipitation in a single week.