Moncton's winters are harsh, with temperatures often plummeting below -18°C in January and February, averaging around -4°C. Spring brings a gradual warming trend, with temperatures rising to as high as 21°C by April. Summer is mild, with July and August averages peaking at around 19°C, punctuated by occasional heatwaves reaching up to 33°C. Autumn sees temperatures cool again, dropping back down to around -2°C in October before stabilizing into the chilly winter months.