Winters in Attleboro are cold and snowy, with temperatures often below freezing, averaging around -2°C in January. As the season progresses, temperatures gradually warm up, but remain quite chilly throughout February and March. Spring brings a noticeable increase in temperature, with April and May experiencing mild to warm conditions, with averages reaching as high as 14°C. Summer is warm to hot, with June being the hottest month of the year, averaging 21°C, while July's temperatures are slightly cooler, but still pleasant.