Historical weather data, all-time temperature records, and monthly climate averages for Wilmington, MA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4 in Wilmington lands right in that unpredictable stretch of early spring — the average high is 53° with a low around 34°, but this date has seen everything from a 77° scorcher back in 1950 to a brutal 15° low in 1954. Flip a coin on precipitation: nearly half of all April 4ths on record have seen some form of it, though snow is essentially off the table.
Wilmington's weather has real range — from a sweltering 102° in July 2010 to a bone-chilling -20° in January 1957, that's a 122-degree spread over the station's history. The wettest single day on record dumped 8.48 inches back in September 1954, and a December 1960 storm buried the area under 19.8 inches of snow in one shot.
Summer peaks in the third week of July with average highs around 84°, while mid-January bottoms out at a frigid 34°. The shoulder months are mild but moody — spring and fall both bring frequent rain, and December is actually the wettest stretch of the year. If you're planning a visit, July and August offer the most reliably warm and dry conditions.