Moncton Weather

Despite being less than 50 km 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 late February. Trees are usually in full leaf by late May. Summers are warm, sometimes hot, as well as 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).

The highest temperature ever recorded in Moncton was 37.8 °C (100 °F) on August 18 & 19, 1935. The coldest temperature ever recorded was −37.8 °C (−36 °F) on February 5, 1948.

Average Temperature
Jan
27 °F
-3 °C
Feb
25 °F
-4 °C
Mar
32 °F
0 °C
Apr
45 °F
7 °C
May
56 °F
14 °C
Jun
70 °F
21 °C
Jul
77 °F
25 °C
Aug
77 °F
25 °C
Sep
68 °F
20 °C
Oct
59 °F
15 °C
Nov
41 °F
5 °C
Dec
30 °F
-1 °C
Humidity
Jan
69%
Feb
65%
Mar
63%
Apr
76%
May
74%
Jun
70%
Jul
72%
Aug
72%
Sep
77%
Oct
75%
Nov
73%
Dec
71%
Rain
Jan
63mm
Feb
37mm
Mar
32mm
Apr
65mm
May
49mm
Jun
55mm
Jul
44mm
Aug
58mm
Sep
56mm
Oct
52mm
Nov
78mm
Dec
38mm
Clouds
Jan
54%
Feb
41%
Mar
28%
Apr
78%
May
62%
Jun
48%
Jul
35%
Aug
39%
Sep
47%
Oct
61%
Nov
67%
Dec
51%
Air quality US AQI
Jan
18
Feb
18
Mar
13
Apr
12
May
13
Jun
16
Jul
29
Aug
23
Sep
17
Oct
15
Nov
17
Dec
20
Sun
Jan
1UVI
Feb
2UVI
Mar
3UVI
Apr
4UVI
May
5UVI
Jun
6UVI
Jul
7UVI
Aug
6UVI
Sep
5UVI
Oct
3UVI
Nov
1UVI
Dec
1UVI