Cornwall, Canada Climate
Canada
Pop. 48,821 Elev. 59 m / 194 ft
TZ: America/Toronto (UTC-4) ·
Cornwall has a dry climate with warm summers reaching 83°F (28°C) in July and cold winters averaging 11°F (-12°C) in February. Humidity pushes the summer feels-like temperature to 88°F (31°C), while wind chill can drive winter lows to 2°F (-17°C). Rain falls on about 49 days per year (32.2 in / 819 mm total), with snow on 11 days and 103 in (2614 mm) of annual accumulation. Overcast skies are common, with only 69 sunny days per year. Nearby lake water reaches 70°F (21°C) in summer.
| Temperature | 28°C (83°F) high | -12°C (11°F) low |
| Feels like | 31°C (88°F) high | -17°C (2°F) low |
| Rain | 49 days | 819 mm (32.2 in) /yr |
| Snow | 11 days | 2614 mm (102.9 in) /yr |
| Sky | 69 sunny | 19 stormy |
| Wind | 1.6 m/s (3.5 mph) avg |
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Explore on the MapMonthly Climate Chart
Best months to visit: Jun, Aug, Sep
Sky & Air by Month
Cloud cover (%)
78
Jan 74
Feb 71
Mar 72
Apr 77
May 58
Jun 56
Jul 48
Aug 45
Sep 48
Oct 78
Nov 81
Dec Humidity (%)
70
Jan 71
Feb 65
Mar 60
Apr 69
May 63
Jun 68
Jul 61
Aug 68
Sep 68
Oct 80
Nov 72
Dec Weather Days by Month
Water Temperatures
Cities with Similar Climate
Find similar cities on the map →Nearby Cities
Nearby
Commercial airport 13 km Massena International Airport Richards Field (MSS)
Ski resort 48 km Titus Mountain
National park 35 km DuPont Provincial Park
Mountain peak
(1,555 m) 114 km Algonquin Peak
Hospital 2 km Cornwall Community Hospital
Hiking trail 76 km Long Pond Mountain Trail
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Monthly Weather Data
↑ See chart| Month | Avg High | Avg Low | Rainfall | Snowfall | Sunny Days |
|---|---|---|---|---|---|
| January | -4°C 25°F | -11°C 12°F | 6 mm 0.2 in | 494 mm19.4 in | 2 |
| February | -3°C 26°F | -12°C 11°F | 11 mm 0.4 in | 798 mm31.4 in | 3 |
| March | 6°C 44°F | -4°C 25°F | 63 mm 2.5 in | 371 mm14.6 in | 3 |
| April | 13°C 56°F | 2°C 35°F | 97 mm 3.8 in | 119 mm4.7 in | 3 |
| May | 19°C 67°F | 9°C 48°F | 96 mm 3.8 in | — | 4 |
| June | 26°C 78°F | 15°C 59°F | 64 mm 2.5 in | — | 5 |
| July | 28°C 83°F | 17°C 63°F | 89 mm 3.5 in | — | 7 |
| August | 27°C 80°F | 15°C 58°F | 52 mm 2.0 in | — | 13 |
| September | 23°C 74°F | 11°C 52°F | 60 mm 2.4 in | — | 16 |
| October | 16°C 61°F | 6°C 42°F | 172 mm 6.8 in | 0 mm0.0 in | 12 |
| November | 4°C 39°F | -1°C 31°F | 76 mm 3.0 in | 293 mm11.5 in | 1 |
| December | -2°C 28°F | -10°C 13°F | 34 mm 1.3 in | 539 mm21.2 in | 0 |
Weather Days by Month
↑ See chart| Month | Sunny Days | Storm Days |
|---|---|---|
| January | 2 | 0 |
| February | 3 | 0 |
| March | 3 | 2 |
| April | 3 | 2 |
| May | 4 | 1 |
| June | 5 | 1 |
| July | 7 | 6 |
| August | 13 | 2 |
| September | 16 | 2 |
| October | 12 | 3 |
| November | 1 | 0 |
| December | 0 | 0 |
Water Temperatures Data
↑ See chart| Month | Lake Avg High |
|---|---|
| January | 0°C 32°F |
| February | 0°C 32°F |
| March | 0°C 32°F |
| April | 2°C 35°F |
| May | 6°C 42°F |
| June | 12°C 54°F |
| July | 21°C 70°F |
| August | 21°C 69°F |
| September | 18°C 65°F |
| October | 13°C 55°F |
| November | 7°C 44°F |
| December | 2°C 35°F |