Saint John Weather: December
 |
Average Day Temperature: | 30.5°F |
|
Average Night Temperature: | 25.5°F |
|
Sea Water Temperature: | 45.3°F |
|
Number of Sunny Days: | 8 days |
| Sunshine Hours: | 8.7 - 9.0 hours | |
|
Number of Rainy Days: | 2 days |
| Precipitation Totals: | 1.6 in | |
| detailed information | ||
forecast
| Saint John |
Temperature
| Saint John |
Air Temperature in December, °F
The highest day temperature in December 2025 was 54°F. The lowest night temperature was -2°F. The average values for day and night temperatures during December were 25.8°F и 19.0°F respectivly.
Saint John Water Sea Temperature in December, °F
The average sea surface temperature in December 2025 for Saint John was 44.1°F. The maximum and minimum values were 41.0°F and 47.4°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 Saint John is 1.6 in. It makes december the most rainy month of the year.
The average wind speed in December is 9.0 mph. It makes December the most windy month of the year for Saint John.
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 Saint John in December is 4.0 hours.
Saint John on the Weather Map
| Halifax |  |
+38 |
| Kingston |  |
+32 |
| Montreal | |
+34 |
| Niagara Falls | |
+42 |
| Ottawa | |
+30 |
| Prince Edward Island | |
+36 |
| Quebec | |
+28 |
| Saint John | |
+36 |
| St. John's |  |
+34 |
| Sydney | |
+36 |
| Toronto | |
+36 |
| Vancouver |  |
+48 |
| Victoria | |
+48 |
| Winnipeg | |
+14 |
| Yellowknife | |
-2 |
| 1800 |  |
36°F | SE 6 mph |
| 2100 |  |
30°F | E 2 mph |
| 0000 | |
28°F | SW 4 mph |
| 0300 | |
28°F | W 6 mph |
| 0600 | |
28°F | W 9 mph |
| 0900 | |
28°F | W 10 mph |
| 1200 |  |
28°F | W 10 mph |
| 1500 | |
30°F | W 9 mph |