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Weather & Climate in Chatham, ON
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Chatham experiences four distinct seasons with an average annual temperature of 51°F (10°C). Winters average 28°F in January while summers reach 72°F in July. The area gets 272 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 33.6 inches. The area receives 26.7 inches of snow annually, a moderate snowfall amount. The city sits at an elevation of 600 feet.
Temperature
28°F Jan (-3°C)
72°F Jul (22°C)
| Annual Average | 50.6°F |
| 6% below US avg | |
| January Average | 28°F (-3°C) |
| July Average | 72°F (22°C) |
| Sunny Days | 272 days/yr |
Geography
| Elevation | 600 ft (183 m) |
| Area | 25.6 sq mi (66.4 km²) |
| Population Density | 1,699/sq mi |
| Coordinates | 42.4122°N, 82.1849°W |
| Timezone | America/Toronto |
Precipitation & Snow
Air Quality
Earthquake History
43 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.0.
| Jun 10, 2019 | 1 km NW of Timberlake, Ohio | M4.0 | 101 km | 2 km |
| Jan 26, 2001 | 8 km NNW of Edgewood, Ohio | M3.9 | 125 km | 5 km |
| Mar 12, 2007 | Ohio | M3.7 | 143 km | 5 km |
| Jun 30, 2003 | 6 km NW of Perry, Ohio | M3.6 | 106 km | 5 km |
| Aug 28, 2023 | 7 km SE of Madison, Ohio | M3.6 | 126 km | 5 km |
| Oct 16, 1993 | 8 km SSE of Madison, Ohio | M3.6 | 125 km | 5 km |
| Jun 20, 2006 | 9 km WNW of North Perry, Ohio | M3.5 | 101 km | 5 km |
| Mar 15, 1992 | 15 km NW of North Perry, Ohio | M3.5 | 95 km | 5 km |
| Jun 3, 2001 | 3 km N of Edgewood, Ohio | M3.4 | 130 km | 5 km |
| Jan 26, 1991 | 1 km NNE of Mayfield Heights, Ohio | M3.4 | 115 km | 5 km |
| Apr 20, 2018 | Michigan | M3.4 | 76 km | 3 km |
| Jun 30, 2004 | 2 km WNW of Madison, Ohio | M3.3 | 115 km | 5 km |
| Jul 1, 2013 | 5 km NNW of Fairport Harbor, Ohio | M3.2 | 101 km | 5 km |
| Mar 11, 2006 | 8 km NNW of Mentor-on-the-Lake, Ohio | M3.1 | 96 km | 5 km |
| Jan 9, 2008 | 6 km WNW of Mentor-on-the-Lake, Ohio | M3.1 | 99 km | 5 km |
| Feb 23, 2011 | 18 km NE of Leamington, Canada | M3.0 | 35 km | 5 km |
| Apr 25, 2010 | 2 km WNW of Madison, Ohio | M3.0 | 115 km | 5 km |
| Feb 23, 1995 | 3 km W of Ashtabula, Ohio | M2.9 | 127 km | 5 km |
| Sep 22, 1999 | 16 km NW of Mentor-on-the-Lake, Ohio | M2.8 | 88 km | 18 km |
| Apr 12, 2007 | 11 km NW of Put-in-Bay, Ohio | M2.8 | 98 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tsunami History
2 tsunamis recorded within 500 km. Highest wave on record: 2.7 m (9 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1823 | LAKE ERIE | Unknown | 2.7 m | - | 98 km |
| 1952 | LAKE HURON, MI | Avalanche | 1.5 m | - | 79 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 28°F (-3°C) | 2.2 in | |
| February | 24°F (-5°C) | 2.1 in | Coldest, Driest |
| March | 34°F (1°C) | 2.4 in | |
| April | 45°F (7°C) | 3.1 in | |
| May | 57°F (14°C) | 3.1 in | |
| June | 67°F (19°C) | 3.2 in | |
| July | 72°F (22°C) | 3.2 in | Warmest |
| August | 70°F (21°C) | 3.2 in | |
| September | 63°F (17°C) | 3.6 in | Wettest |
| October | 52°F (11°C) | 2.6 in | |
| November | 41°F (5°C) | 3.1 in | |
| December | 30°F (-1°C) | 2.7 in |
Chatham has a seasonal temperature swing of 49°F / from 24°F in February to 72°F in July. Total annual precipitation is 34.5 inches, with September being the wettest month (3.6") and February the driest (2.1").