Thunder Bay weather in December
Temperature, rain and sunshine in December: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in December
Poor
Best time to visit: June – September
What is the weather like in Thunder Bay in December?
In December, Thunder Bay is freezing cold: daytime highs average −4 °C, and nights often drop below freezing (−11 °C). The sun is scarce, with only about 3 hours a day. Precipitation, often as snow, falls on about 8 days, totalling 46 mm. Snow falls on about 7 days. All in all, December is not an ideal month for a holiday in Thunder Bay.
December compared
How the weather changes from November to January. Tap a month to open it.
| NovemberNov | DecemberDec | JanuaryJan | |
|---|---|---|---|
| Score | 20 | 21 | 26 |
| Day | 3° | −4° | −9° |
| Night | −2° | −11° | −15° |
| Sun | 3 h | 3 h | 4 h |
| Rain days | 9 | 8 | 7 |
More details for December
- Daylight
- 8 h 21 min08:41 – 17:03
- UV index
- 1 · lowclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 25 km/haverage daily peakAll months
- Cloud cover
- 78 %on averageAll months
- Hot days
- 0 days30 °C or more
- Snow days
- 7 days1 cm or more of fresh snowAll months
- Time zone
- UTC−5America/Toronto
How the score comes together
- Temperatureweight 50 %0 %
- Sunshineweight 20 %0 %
- Few rainy daysweight 30 %69 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in December
- Warm jacket
- Hat, scarf & gloves
- Rain jacket or umbrella
Thunder Bay in December: quick answers
Is Thunder Bay hot in December?
No. In December, Thunder Bay is freezing cold: daytime highs average −4 °C and nights drop to about −11 °C.
Does it rain much in Thunder Bay in December?
Rain falls on about 8 days, adding up to 46 mm.
Thunder Bay month by month
The whole year in Thunder BayAll destinations: CanadaWhere to go in December
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences