December weather forecastSaint John, Canada
December
Weather in December
Finally, December in Saint John, Canada is synonymous with winter's arrival, plunging temperatures, and the holiday season. It's a festive time of the year with a fairytale-like panorama offered by the city's snow-clad streets. While outdoor activities are limited, the enchanting Christmas lights and decorations invite everyone to experience the festive atmosphere. The decreasing daylight hours create an inviting environment for heartwarming indoor activities. December sees an escalation in snowfall from 17mm (0.67") to 38mm (1.5") and temperatures spanning from -4.3°C (24.3°F) to 1.3°C (34.3°F), providing an emblematic end to the year.Temperature
December's arrival correlates with a reduction in the average high-temperature, down from a frosty 6.8°C (44.2°F) in November to a cold 1.3°C (34.3°F). The average low-temperature, in December, in Saint John, Canada, is a freezing cold -4.3°C (24.3°F).Humidity
In December, the average relative humidity in Saint John is 82%.Rainfall
The month with the most rainfall is December, when the rain falls for 8.9 days and typically aggregates up to 43mm (1.69") of precipitation.Snowfall
January through May, November and December are months with snowfall in Saint John. In Saint John, in December, during 5.6 snowfall days, 38mm (1.5") of snow is typically accumulated. Throughout the year, there are 37.1 snowfall days, and 188mm (7.4") of snow is accumulated.Sea temperature
In Saint John, in December, the average water temperature is 7°C (44.6°F).Note: Caution: 7°C (44.6°F) temperatures below 10°C (50°F) during swimming can result in intense cold shock and quickened breathing.
Daylight
With an average of 8h and 48min of daylight, December has the shortest days of the year in Saint John.On the first day of the month, sunrise is at 7:43 am and sunset at 4:43 pm. On the last day of December, sunrise is at 8:03 am and sunset at 4:51 pm AST.
Sunshine
In Saint John, the average sunshine in December is 3.9h.UV index
The months with the lowest UV index are January through April, October through December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: An average UV index of 2 in December transforms into this advice:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Stay sun-safe with clothing that is both closely woven and worn loosely. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Saint John, Canada
- Average high temperature in December: 1.3°C
The warmest month (with the highest average high temperature) is August (21.5°C).
The month with the lowest average high temperature is January (-1.9°C).
- Average low temperature in December: -4.3°C
The month with the highest average low temperature is August (14.3°C).
The coldest month (with the lowest average low temperature) is January (-8.6°C).
Average pressure in December
Saint John, Canada
- Average pressure in December: 1014.9mbar
The month with the highest atmospheric pressure is September (1017mbar).
The month with the lowest atmospheric pressure is June (1012.8mbar).
Average wind speed in December
Saint John, Canada
- Average wind speed in December: 19.3km/h
The windiest month (with the highest average wind speed) is January (19.9km/h).
The calmest month (with the lowest average wind speed) is August (12.3km/h).
Average humidity in December
Saint John, Canada
- Average humidity in December: 82%
The months with the highest relative humidity are January and February (85%).
The months with the lowest relative humidity are October and November (80%).
Average rainfall in December
Saint John, Canada
- Average rainfall in December: 43mm
The wettest month (with the highest rainfall) is December (43mm).
The driest month (with the least rainfall) is August (22mm).
Average rainfall days in December
Saint John, Canada
- Average rainfall days in December: 8.9 days
The month with the highest number of rainy days is May (14.2 days).
The month with the least rainy days is February (5.4 days).
Average snowfall in December
Saint John, Canada
- Average snowfall in December: 38mm
The month with the highest snowfall is January (40mm).
The months with the least snowfall are June, July, August, September and October (0mm).
Average snowfall days in December
Saint John, Canada
- Average snowfall days in December: 5.6 days
The month with the highest number of snowfall days is March (9.6 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average sea temperature in December
Saint John, Canada
- Average sea temperature in December: 7°C
The best month for swimming (with the highest average sea temperature) is August (13.3°C).
The coldest month (with the lowest average sea temperature) is March (2.9°C).
Average daylight in December /
Average sunshine in December
Saint John, Canada
- Average daylight in December: 8h and 48min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in December: 3h and 54min
The month with the most sunshine is August (Average sunshine: 9h and 30min).
The month with the least sunshine is February (Average sunshine: 3h and 42min).
Average sunshine days in December
Saint John, Canada
- Average sunshine days in December: 16.9 days
The month with the most sunshine days is January (18.9 days).
The month with the least sunshine days is April (11.8 days).
Average UV index in December
Saint John, Canada
- Average UV index in December: 2
The months with the highest UV index are July and August (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).
Average cloud cover in December
Saint John, Canada
- Average cloud cover in December: 59
The month with the most cloud cover is February (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 36).
Average visibility in December
Saint John, Canada
- Average visibility in December: 9km
The month with the highest visibility is October (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, November and December (9km).
