Thunder Bay Weather: December
 |
Average Day Temperature: | 17.9°F |
|
Average Night Temperature: | 14.9°F |
|
Sea Water Temperature: | 37.1°F |
|
Number of Sunny Days: | 5 days |
| Sunshine Hours: | 8.3 - 8.6 hours | |
|
Number of Rainy Days: | 0 days |
| Precipitation Totals: | 0.6 in | |
|
Number of Snowy Days: | 1 day |
| detailed information | ||
forecast
| Thunder Bay |
Temperature
| Thunder Bay |
Air Temperature in December, °F
The highest day temperature in December 2025 was 33°F. The lowest night temperature was -17°F. The average values for day and night temperatures during December were 10.2°F и 2.5°F respectivly.
Thunder Bay Water Sea Temperature in December, °F
The average sea surface temperature in December 2025 for Thunder Bay was 35.7°F. The maximum and minimum values were 31.6°F and 40.8°F respectively.
Most of the days in December are gloomy but you can also expect sunny days.
Precipitation Totals in December, in
Precipitation total in December for Thunder Bay is 0.6 in. It makes december one of the least rainy months of the year.
The average wind speed in December is 9.2 mph. It makes December one of the most windy months of the year for Thunder Bay.
We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Thunder Bay in December is 3.2 hours.
Thunder Bay on the Weather Map
| Barrie |  |
+58 |
| Halifax |  |
+64 |
| Kingston |  |
+66 |
| Montreal | |
+66 |
| Ottawa | |
+66 |
| Prince Edward Island |  |
+64 |
| Quebec | |
+62 |
| Saint John | |
+64 |
| St. John's |  |
+54 |
| Sydney |  |
+58 |
| Toronto | |
+62 |
| Vancouver | |
+58 |
| Victoria | |
+56 |
| Winnipeg | |
+76 |
| Yellowknife |  |
+54 |
| 0600 |  |
66°F | N 1 mph |
| 0900 |  |
70°F | NE 3 mph |
| 1200 |  |
86°F | NE 7 mph |
| 1500 | |
86°F | NE 6 mph |
| 1800 |  |
84°F | SE 6 mph |
| 2100 |  |
74°F | NE 12 mph |
| 0000 |  |
72°F | SE 9 mph |
| 0300 | |
68°F | SE 4 mph |