Last updated: July 31, 2025
Under the Köppen–Geiger climate classification Thetford-Mines features a humid continental climate (Dfb). Temperatures typically range between -10 °C (15 °F) and 19 °C (67 °F) through the year, but rarely can drop to -30 °C (-22 °F) or can rise to as high as 31 °C (88 °F). The average annual precipitation amounts to about 1333 mm (52.5 inches) and receives 165 rainy days on the 1 mm (0.04 inches) threshold annually. Thetford-Mines enjoys an average of 2745 hours of sunshine throughout the year, and daylight varies from 8 hours 41 minutes to 15 hours 40 minutes per day.
The warmest months in Thetford-Mines are June, July and August, with daily mean temperatures ranging from 16 to 19 °C (61 - 67 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -10 to -7 °C (15 - 20 °F) throughout the day. On average each year, Thetford-Mines experiences 19 days above 25 °C (77.0 °F) and 151 days below 0 °C (32.0 °F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Maximum | 10°C (50°F) | 9°C (49°F) | 16°C (60°F) | 21°C (70°F) | 29°C (84°F) | 29°C (85°F) | 31°C (88°F) | 30°C (86°F) | 28°C (82°F) | 20°C (69°F) | 19°C (67°F) | 13°C (55°F) |
| Mean maximum | 5°C (41°F) | 6°C (42°F) | 9°C (49°F) | 17°C (63°F) | 26°C (79°F) | 27°C (80°F) | 28°C (83°F) | 28°C (82°F) | 25°C (77°F) | 19°C (67°F) | 14°C (58°F) | 9°C (48°F) |
| Average high | -6°C (22°F) | -4°C (25°F) | -0°C (32°F) | 7°C (45°F) | 16°C (61°F) | 20°C (69°F) | 23°C (74°F) | 23°C (73°F) | 18°C (66°F) | 12°C (53°F) | 3°C (37°F) | -3°C (27°F) |
| Daily mean | -10°C (15°F) | -8°C (17°F) | -4°C (25°F) | 3°C (38°F) | 11°C (52°F) | 16°C (61°F) | 19°C (67°F) | 18°C (65°F) | 14°C (57°F) | 8°C (46°F) | -1°C (31°F) | -7°C (20°F) |
| Average low | -13°C (8°F) | -13°C (9°F) | -8°C (18°F) | -0°C (31°F) | 6°C (44°F) | 11°C (52°F) | 15°C (59°F) | 14°C (58°F) | 10°C (50°F) | 4°C (40°F) | -4°C (25°F) | -10°C (13°F) |
| Mean minimum | -26°C (-14°F) | -24°C (-11°F) | -21°C (-6°F) | -9°C (17°F) | -0°C (32°F) | 5°C (41°F) | 9°C (49°F) | 9°C (48°F) | 3°C (37°F) | -2°C (28°F) | -16°C (4°F) | -23°C (-9°F) |
| Minimum | -30°C (-22°F) | -26°C (-14°F) | -26°C (-14°F) | -13°C (9°F) | -2°C (29°F) | -0°C (32°F) | 8°C (47°F) | 6°C (43°F) | -0°C (32°F) | -7°C (20°F) | -21°C (-5°F) | -28°C (-18°F) |
Compare temperature, precipitation, sunshine, UV index in Thetford-Mines, Canada with other places around the world.
Thetford-Mines usually has the most precipitation in June, July and October, with an average of 15 rainy days and 134 mm (5.3 inches) of precipitation per month. The driest months in Thetford-Mines are March, September and December. On average, 87 mm (3.4 inches) of precipitation falls during these months.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Average precipitation mm (inches) | 91 (3.6) | 91 (3.6) | 91 (3.6) | 127 (5.0) | 113 (4.5) | 136 (5.3) | 132 (5.2) | 132 (5.2) | 79 (3.1) | 134 (5.3) | 117 (4.6) | 90 (3.6) |
| Average precipitation days (≥ 1 mm) | 12 | 14 | 12 | 14 | 14 | 14 | 17 | 15 | 10 | 14 | 15 | 14 |
The sunniest months in Thetford-Mines are June, July and August, when the sun shines an average of 10 hours 47 minutes a day. Least sunny months in Thetford-Mines: January, November and December receive an average of 4 hours 11 minutes of sunshine daily.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mean monthly sunshine hours | 107 | 159 | 227 | 214 | 292 | 327 | 337 | 328 | 279 | 192 | 137 | 140 |
| Mean daily daylight hours | 9h 6m | 10h 21m | 11h 57m | 13h 34m | 14h 58m | 15h 40m | 15h 17m | 14h 2m | 12h 28m | 10h 51m | 9h 26m | 8h 41m |
Thetford-Mines experiences the highest level of ultraviolet (UV) radiation in May, June and August, when the maximum UV index can reach values of 8 - 9, which corresponds to the Very High category of sun exposure. January, February and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 3. For more detailed information, check out our hourly Thetford-Mines UV Index data.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV Index (month maximum) | 2 | 3 | 5 | 7 | 9 | 9 | 8 | 8 | 7 | 5 | 3 | 2 |