Moncton - Climate

Climate

Despite being less than 50 km (31 mi) from the Bay of Fundy and less than 30 km (19 mi) from the Northumberland Strait, the climate tends to be more continental than maritime during the summer and winter seasons, with maritime influences somewhat tempering the transitional seasons of spring and autumn.

Moncton has a warm summer continental climate (Köppen climate classification Dfb) with uniform precipitation distribution. Winter days are typically cold but generally sunny with solar radiation generating some warmth. Daytime high temperatures usually range a few degrees below the freezing point. Major snowfalls can result from nor'easter ocean storms moving up the east coast of North America. These major snowfalls typically average 20–30 cm (8–12 in) and are frequently mixed with rain or freezing rain. Spring is frequently delayed because the sea ice that forms in the nearby Gulf of St. Lawrence during the previous winter requires time to melt, and this will cool onshore winds, which can extend inland as far as Moncton. The ice burden in the gulf has diminished considerably over the course of the last decade (which may be a consequence of global warming), and the springtime cooling effect has weakened as a result. Daytime temperatures above freezing are typical by early March. Trees are usually in full leaf by mid May. Summers are hot and humid due to the seasonal prevailing westerly winds strengthening the continental tendencies of the local climate. Daytime highs sometimes reach more than 30 °C (86 °F). Rainfall is generally modest, especially in late July and August, and periods of drought are not uncommon. Autumn daytime temperatures remain mild until late October. First snowfalls usually do not occur until late November and consistent snow cover on the ground does not happen until late December. The Fundy coast of New Brunswick occasionally experiences the effects of post-tropical storms. The stormiest weather of the year, with the greatest precipitation and the strongest winds, usually occurs during the fall/winter transition (November to mid-January).