December weather forecast
Saint Petersburg, Russia

December in Saint Petersburg paints a picture of glistening snow, silver trees under a grey sky, and warm rosy cheeks. The weather is chilly, especially towards the year-end. Longer nights and the festive season create a magical atmosphere with fairy lights and festive decorations spread across the city. The year ends with a promise of renewed experiences in the forthcoming chapters.

Temperature

A moderate decline in average high-temperatures is noted in December, moving from a cold 2°C (35.6°F) in November to a subzero cold -1.5°C (29.3°F). The December average low temperature in Saint Petersburg, marginally lower than the daytime high, records at a still freezing cold -6.1°C (21°F).

Humidity

The most humid month is December, with an average relative humidity of 87%.

Rainfall

In Saint Petersburg, in December, it is raining for 10 days, with typically 51mm (2.01") of accumulated precipitation. Throughout the year, in Saint Petersburg, there are 173 rainfall days, and 662mm (26.06") of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, October through December. The months with the most snowfall days in Saint Petersburg are January, February and December, with an average of 17 snowfall days.

Sea temperature

In Saint Petersburg, the average seawater temperature in December is 2.8°C (37°F).
Note: While swimming, this scenario is perilously cold, dangerous, and potentially fatal. Hypothermia is almost imminent without proper insulated waterproof attire.

Daylight

December has the shortest days of the year, with an average of 6h and 6min of daylight.
On the first day of December in Saint Petersburg, sunrise is at 09:33 and sunset at 16:01. On the last day of the month, sunrise is at 10:00 and sunset at 16:03 MSK.

Sunshine

With an average of 0.4h of sunshine, December has the least sunshine of the year.

UV index

The months with the lowest UV index in Saint Petersburg are January, November and December, with an average maximum UV index of 0. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: The maximum UV index of 0 during December leads to these instructions:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.