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Weather & Climate in Johnston, NB
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Johnston has a cool climate with an average annual temperature of 42°F (5°C). Winters average 16°F in January while summers reach 66°F in July. The area gets 257 sunny days per year, above the national average. Annual precipitation totals 43.5 inches. The area receives 18.8 inches of snow annually, a moderate snowfall amount. The city sits at an elevation of 43 feet.
Temperature
16°F Jan (-9°C)
66°F Jul (19°C)
| Annual Average | 41.6°F |
| 23% below US avg | |
| January Average | 16°F (-9°C) |
| July Average | 66°F (19°C) |
| Sunny Days | 257 days/yr |
Geography
| Elevation | 43 ft (13 m) |
| Area | 139.3 sq mi (360.9 km²) |
| Population Density | 5/sq mi |
| Coordinates | 45.8954°N, 65.8058°W |
| Timezone | America/Moncton |
Precipitation & Snow
Air Quality
Earthquake History
52 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.0.
| Jul 15, 1998 | 84 km W of Miramichi, Canada | M4.0 | 139 km | 5 km |
| May 6, 1995 | 83 km W of Miramichi, Canada | M3.9 | 137 km | 5 km |
| Jul 14, 1994 | 83 km W of Miramichi, Canada | M3.8 | 137 km | 5 km |
| Jan 5, 2005 | 81 km W of Miramichi, Canada | M3.7 | 137 km | 5 km |
| Feb 2, 2016 | 8 km E of Lubec, Maine | M3.6 | 141 km | 5 km |
| Mar 8, 2009 | 72 km NNE of Noonan, Canada | M3.6 | 87 km | 5 km |
| Aug 27, 2015 | 27 km N of Noonan, Canada | M3.6 | 70 km | 5 km |
| Jun 1, 2006 | 19 km NE of Florenceville-Bristol, Canada | M3.6 | 148 km | 5 km |
| Dec 12, 1990 | 83 km W of Miramichi, Canada | M3.5 | 137 km | 5 km |
| Apr 28, 2014 | 81 km W of Miramichi, Canada | M3.4 | 136 km | 5 km |
| Jan 10, 2019 | 22 km NW of Saint John, Canada | M3.4 | 68 km | 5 km |
| Apr 23, 1991 | 83 km W of Miramichi, Canada | M3.3 | 137 km | 5 km |
| Feb 9, 2016 | 7 km NE of Vanceboro, Maine | M3.3 | 124 km | 1 km |
| Mar 8, 2009 | 71 km NNE of Noonan, Canada | M3.3 | 84 km | 5 km |
| Aug 28, 2013 | 84 km W of Miramichi, Canada | M3.2 | 136 km | 5 km |
| Jul 20, 2007 | 28 km W of Miramichi, Canada | M3.2 | 131 km | 5 km |
| Mar 21, 2013 | 60 km NNE of Noonan, Canada | M3.2 | 64 km | 5 km |
| Jul 3, 2024 | 67 km SW of Miramichi, Canada | M3.1 | 78 km | 12 km |
| Oct 15, 2003 | 11 km E of Saint Andrews, Canada | M3.1 | 125 km | 18 km |
| Jan 2, 2013 | 75 km W of Miramichi, Canada | M3.0 | 136 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Hurricane History
4 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 | 205 km |
| 2008 | Kyle | Category 1 | 75 mph | 235 km |
| 2003 | Juan | Category 2 | 98 mph | 156 km |
| 1996 | Hortense | Category 1 | 81 mph | 265 km |
Source: NOAA IBTrACS (Category 1+, 1980-2026).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 16°F (-9°C) | 3.9 in | Coldest |
| February | 18°F (-8°C) | 3.1 in | Driest |
| March | 28°F (-2°C) | 3.7 in | |
| April | 39°F (4°C) | 3.4 in | |
| May | 51°F (11°C) | 3.8 in | |
| June | 60°F (16°C) | 3.2 in | |
| July | 66°F (19°C) | 3.5 in | Warmest |
| August | 65°F (18°C) | 3.1 in | |
| September | 56°F (13°C) | 3.6 in | |
| October | 46°F (8°C) | 4.2 in | Wettest |
| November | 35°F (2°C) | 4.0 in | |
| December | 22°F (-6°C) | 4.1 in |
Johnston has a seasonal temperature swing of 50°F / from 16°F in January to 66°F in July. Total annual precipitation is 43.5 inches, with October being the wettest month (4.2") and February the driest (3.1").