Weather & Climate in Stone Mills, ON
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Stone Mills has a cool climate with an average annual temperature of 44°F (6°C). Winters average 16°F in January while summers reach 69°F in July. Annual precipitation totals 37.6 inches. The area receives 11.1 inches of snow annually. The city sits at an elevation of 541 feet.
Temperature
16°F Jan (-9°C)
69°F Jul (20°C)
| Annual Average | 43.5°F |
| 19% below US avg | |
| January Average | 16°F (-9°C) |
| July Average | 69°F (20°C) |
Geography
| Elevation | 541 ft (165 m) |
| Area | 267.8 sq mi (693.7 km²) |
| Population Density | 29/sq mi |
| Coordinates | 44.4582°N, 76.9399°W |
| Timezone | America/Toronto |
Precipitation & Snow
Air Quality
Earthquake History
21 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.6.
| Apr 23, 2023 | New York | M3.6 | 99 km | 9 km |
| Dec 25, 1998 | 23 km SE of Cobourg, Canada | M3.6 | 106 km | 18 km |
| Oct 20, 2013 | 34 km SSW of Petawawa, Canada | M3.6 | 134 km | 18 km |
| May 28, 2002 | 11 km WNW of Shawville, Canada | M3.4 | 133 km | 18 km |
| Jun 29, 2024 | 14 km W of Ellisburg, New York | M3.3 | 96 km | 5 km |
| May 8, 2009 | 9 km E of Constance Bay, Canada | M3.1 | 139 km | 21 km |
| Aug 4, 2004 | 30 km SSW of Cobourg, Canada | M3.0 | 135 km | 5 km |
| Nov 7, 2002 | 13 km SSW of Belleville, Canada | M3.0 | 60 km | 18 km |
| Jul 19, 2007 | 27 km S of Cobourg, Canada | M3.0 | 130 km | 5 km |
| Jul 27, 2014 | 13 km SW of Pembroke, Canada | M2.9 | 145 km | 18 km |
| Mar 5, 2009 | 17 km NW of Constance Bay, Canada | M2.8 | 140 km | 5 km |
| Mar 20, 2008 | 12 km S of Osgoode, Canada | M2.8 | 123 km | 6 km |
| Mar 14, 2021 | 19 km SW of Winchester, Canada | M2.7 | 125 km | 10 km |
| Aug 11, 2007 | 4 km N of Kingston, Canada | M2.6 | 42 km | 4 km |
| Apr 14, 2023 | 1 km W of Adams Center, New York | M2.6 | 99 km | 6 km |
| Apr 11, 2007 | 6 km NNE of Sodus Point, New York | M2.6 | 126 km | 7 km |
| Jun 5, 2006 | 7 km ESE of Constance Bay, Canada | M2.5 | 134 km | 10 km |
| May 10, 2022 | southern Ontario, Canada | M2.5 | 112 km | 11 km |
| Oct 6, 2017 | 9 km SSE of Nepean, Canada | M2.5 | 134 km | 17 km |
| Mar 17, 2004 | 12 km SSW of Osgoode, Canada | M2.5 | 121 km | 18 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 16°F (-9°C) | 3.1 in | Coldest |
| February | 18°F (-8°C) | 2.3 in | Driest |
| March | 28°F (-2°C) | 2.6 in | |
| April | 42°F (5°C) | 3.1 in | |
| May | 54°F (12°C) | 3.4 in | |
| June | 63°F (17°C) | 3.2 in | |
| July | 69°F (20°C) | 2.5 in | Warmest |
| August | 67°F (20°C) | 2.9 in | |
| September | 59°F (15°C) | 4.0 in | Wettest |
| October | 47°F (9°C) | 3.6 in | |
| November | 36°F (2°C) | 3.9 in | |
| December | 23°F (-5°C) | 3.1 in |
Stone Mills has a seasonal temperature swing of 53°F / from 16°F in January to 69°F in July. Total annual precipitation is 37.6 inches, with September being the wettest month (4.0") and February the driest (2.3").