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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. The area gets 268 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. 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) |
| Sunny Days | 268 days/yr |
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").