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Weather & Climate in Dorchester, NB
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Dorchester has a cool climate with an average annual temperature of 42°F (6°C). Winters average 18°F in January while summers reach 64°F in July. The area gets 250 sunny days per year, above the national average. Annual precipitation totals 47.6 inches (wetter than the 38-inch national average). The area receives 16.7 inches of snow annually, a moderate snowfall amount. The city sits at an elevation of 131 feet.
Temperature
18°F Jan (-8°C)
64°F Jul (18°C)
| Annual Average | 42.0°F |
| 22% below US avg | |
| January Average | 18°F (-8°C) |
| July Average | 64°F (18°C) |
| Sunny Days | 250 days/yr |
Geography
| Elevation | 131 ft (40 m) |
| Area | 2.2 sq mi (5.7 km²) |
| Population Density | 411/sq mi |
| Coordinates | 45.9016°N, 64.5080°W |
| Timezone | America/Moncton |
Precipitation & Snow
Air Quality
Earthquake History
13 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.2.
| Mar 21, 2013 | 60 km NNE of Noonan, Canada | M3.2 | 138 km | 5 km |
| Jul 3, 2024 | 67 km SW of Miramichi, Canada | M3.1 | 142 km | 12 km |
| Mar 14, 2018 | 16 km WNW of Saint John, Canada | M2.9 | 148 km | 2 km |
| Apr 22, 2016 | New Brunswick, Canada | M2.9 | 132 km | 5 km |
| Mar 7, 2019 | 15 km WSW of Miramichi, Canada | M2.9 | 149 km | 10 km |
| Nov 28, 2013 | 55 km NNW of Sussex, Canada | M2.8 | 105 km | 5 km |
| Jan 3, 2017 | 20 km E of Oromocto, Canada | M2.7 | 133 km | 5 km |
| Mar 7, 2008 | 32 km S of Miramichi, Canada | M2.7 | 117 km | 5 km |
| Feb 1, 2018 | 54 km NNW of Sussex, Canada | M2.6 | 107 km | 2 km |
| Feb 2, 2018 | 55 km NNW of Sussex, Canada | M2.6 | 107 km | 2 km |
| Apr 22, 2016 | 69 km SSW of Miramichi, Canada | M2.6 | 133 km | 5 km |
| Nov 28, 2013 | 60 km SSW of Miramichi, Canada | M2.6 | 117 km | 5 km |
| Apr 24, 2015 | 67 km NW of Salisbury, Canada | M2.5 | 111 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
6 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 2.
| Year | Name | Category | Max Wind | Closest |
| 2010 | Earl | Category 1 | 75 mph | 111 km |
| 2009 | Bill | Category 1 | 75 mph | 230 km |
| 2008 | Kyle | Category 1 | 75 mph | 269 km |
| 2003 | Juan | Category 2 | 98 mph | 56 km |
| 2002 | Gustav | Category 1 | 92 mph | 277 km |
| 1996 | Hortense | Category 1 | 81 mph | 199 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 18°F (-8°C) | 4.4 in | Coldest |
| February | 20°F (-7°C) | 3.5 in | |
| March | 28°F (-2°C) | 4.1 in | |
| April | 39°F (4°C) | 3.6 in | |
| May | 50°F (10°C) | 4.1 in | |
| June | 58°F (15°C) | 3.9 in | |
| July | 64°F (18°C) | 3.8 in | Warmest |
| August | 64°F (18°C) | 3.3 in | Driest |
| September | 57°F (14°C) | 3.7 in | |
| October | 47°F (8°C) | 4.1 in | |
| November | 37°F (3°C) | 4.5 in | |
| December | 24°F (-4°C) | 4.7 in | Wettest |
Dorchester has a seasonal temperature swing of 47°F / from 18°F in January to 64°F in July. Total annual precipitation is 47.6 inches, with December being the wettest month (4.7") and August the driest (3.3").