St. Marys, Canada Climate
Canada
Pop. 7,386 Elev. 325 m / 1,066 ft
TZ: America/Toronto (UTC-4) ·
St. Marys has a dry climate with warm summers reaching 81°F (27°C) in July and cold winters averaging 14°F (-10°C) in January. Wind chill can push winter lows to 4°F (-16°C). Rain falls on about 48 days per year (29.2 in / 742 mm total), with snow on 12 days and 100 in (2543 mm) of annual accumulation. The city averages 90 sunny days per year and around 28 thunderstorm days. Ocean water temperatures reach 72°F (22°C) in summer.
| Temperature | 27°C (81°F) high | -10°C (14°F) low |
| Feels like | 30°C (85°F) high | -15°C (4°F) low |
| Rain | 48 days | 742 mm (29.2 in) /yr |
| Snow | 12 days | 2543 mm (100.1 in) /yr |
| Sky | 90 sunny | 28 stormy |
| Wind | 1.3 m/s (2.9 mph) avg |
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Explore on the MapMonthly Climate Chart
Best months to visit: May, Aug, Sep, Oct
Sky & Air by Month
Cloud cover (%)
83
Jan 85
Feb 70
Mar 69
Apr 64
May 55
Jun 49
Jul 44
Aug 37
Sep 43
Oct 71
Nov 83
Dec Humidity (%)
80
Jan 79
Feb 68
Mar 61
Apr 70
May 66
Jun 72
Jul 71
Aug 71
Sep 74
Oct 77
Nov 81
Dec Weather Days by Month
Water Temperatures
Cities with Similar Climate
Find similar cities on the map →Nearby Cities
Nearby
Commercial airport 24 km London International Airport (YXU)
Ski resort 100 km Glen Eden
National park 40 km Komoka Provincial Park
Hospital 2 km St. Marys Memorial Hospital
Hiking trail 2 km St. Marys Loop
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Monthly Weather Data
↑ See chart| Month | Avg High | Avg Low | Rainfall | Snowfall | Sunny Days |
|---|---|---|---|---|---|
| January | -4°C 25°F | -10°C 14°F | 5 mm 0.2 in | 575 mm22.6 in | 1 |
| February | -2°C 28°F | -9°C 16°F | 6 mm 0.2 in | 656 mm25.8 in | 0 |
| March | 8°C 47°F | -2°C 28°F | 86 mm 3.4 in | 164 mm6.5 in | 6 |
| April | 13°C 55°F | 2°C 36°F | 85 mm 3.3 in | 100 mm3.9 in | 4 |
| May | 17°C 63°F | 8°C 46°F | 79 mm 3.1 in | — | 7 |
| June | 26°C 78°F | 15°C 59°F | 110 mm 4.3 in | — | 7 |
| July | 27°C 81°F | 16°C 62°F | 87 mm 3.4 in | — | 11 |
| August | 25°C 76°F | 14°C 57°F | 64 mm 2.5 in | — | 14 |
| September | 23°C 73°F | 10°C 51°F | 61 mm 2.4 in | — | 20 |
| October | 16°C 61°F | 6°C 42°F | 71 mm 2.8 in | — | 17 |
| November | 6°C 44°F | 0°C 31°F | 36 mm 1.4 in | 398 mm15.7 in | 3 |
| December | -1°C 30°F | -8°C 17°F | 53 mm 2.1 in | 652 mm25.6 in | 0 |
Weather Days by Month
↑ See chart| Month | Sunny Days | Storm Days |
|---|---|---|
| January | 1 | 0 |
| February | 0 | 0 |
| March | 6 | 4 |
| April | 4 | 4 |
| May | 7 | 3 |
| June | 7 | 4 |
| July | 11 | 3 |
| August | 14 | 4 |
| September | 20 | 3 |
| October | 17 | 2 |
| November | 3 | 0 |
| December | 0 | 1 |
Water Temperatures Data
↑ See chart| Month | Ocean Avg High | Lake Avg High |
|---|---|---|
| January | 4°C 39°F | 1°C 33°F |
| February | 1°C 34°F | 0°C 32°F |
| March | 1°C 33°F | 1°C 34°F |
| April | 6°C 43°F | 5°C 41°F |
| May | 9°C 49°F | 11°C 52°F |
| June | 18°C 64°F | 18°C 64°F |
| July | 22°C 72°F | 23°C 73°F |
| August | 22°C 72°F | 22°C 71°F |
| September | 18°C 65°F | 18°C 64°F |
| October | 17°C 63°F | 14°C 57°F |
| November | 11°C 51°F | 6°C 42°F |
| December | 6°C 43°F | 1°C 34°F |