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Moncton climate by month
What the weather is like
Moncton has a warm-summer humid continental climate (Köppen Dfb): warm summers, cold winters and precipitation in every season.
The warmest month is July, when afternoons average 25° and nights 13°. January is the coolest month, with highs of -3° and lows of -13°. The difference between the warmest and the coolest month is about 27°, a large swing typical of continental interiors.
About 1,201 mm of precipitation falls in an average year. June is the wettest month (99 mm, 16 wet days) and September the driest (97 mm, 9 wet days). Cloud cover ranges from 37% in August to 49% in April.
The sea reaches about 18° in August. Sea temperatures lag the air by a month or two, so late summer is usually warmer for swimming than early summer.
Compared with Ottawa, the capital, Moncton is 1.8° cooler on a July afternoon and receives more precipitation over the year.
Year in figures
- Hottest afternoons
- 25° · July
- Coldest nights
- -13° · January
- Wettest month
- June
- Driest month
- September
- Clearest skies
- August · 37% cloud
- Warmest sea
- 18° · August
- Longest day
- 15 h 45 min
- Shortest day
- 8 h 39 min
Twelve months at a glance
Temperature and precipitation
Daily high/low range bars, monthly precipitation columns, sea temperature lineTemperature curve
Average high, low and seaDaylight
Hours between sunrise and sunset on the 15th of each monthClimate normals month by month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Average high | -3° | -1° | 3° | 10° | 17° | 22° | 25° | 25° | 20° | 14° | 7° | 1° |
| Average low | -13° | -12° | -7° | -1° | 5° | 10° | 13° | 13° | 9° | 3° | -2° | -8° |
| Precipitation | 100 mm | 86 mm | 108 mm | 93 mm | 100 mm | 99 mm | 95 mm | 88 mm | 97 mm | 117 mm | 108 mm | 110 mm |
| Wet days (≥1 mm) | 11.2 | 9.5 | 13.2 | 10.8 | 14.5 | 16.3 | 15.2 | 12.2 | 8.7 | 10.3 | 12.3 | 13 |
| Cloud cover | 44% | 45% | 47% | 49% | 46% | 43% | 40% | 37% | 39% | 42% | 49% | 46% |
| Sea temperature | -1° | -1° | -1° | 1° | 6° | 12° | 17° | 18° | 16° | 12° | 7° | 2° |
| Daylight | 9h 02 | 10h 22 | 11h 52 | 13h 32 | 14h 57 | 15h 45 | 15h 25 | 14h 11 | 12h 35 | 10h 58 | 9h 28 | 8h 39 |
| Month score | 26 | 29 | 20 | 25 | 54 | 62 | 63 | 68 | 76 | 48 | 21 | 21 |