December weather forecast
Saint Petersburg, Russia

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A stunning night panorama of the lit Kazan Cathedral in Saint Petersburg, Russia
A stunning night panorama of the lit Kazan Cathedral in Saint Petersburg, Russia

Weather in December

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.

Frequently asked questions

How cold is it in Saint Petersburg in December?

Saint Petersburg in December has an average high-temperature of -1.5°C (29.3°F) and an average low-temperature of -6.1°C (21°F).

What is the most humid month in Saint Petersburg?

With an average relative humidity of 87%, December is the most humid month in Saint Petersburg, Russia.

What is the average humidity in December in Saint Petersburg?

In Saint Petersburg, Russia, the average relative humidity in December is 87%.

How much does it rain in Saint Petersburg in December?

In Saint Petersburg, Russia, during December, the rain falls for 10 days and regularly aggregates up to 51mm (2.01") of precipitation.

When does it snow the most in Saint Petersburg?

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

How many days does it snow in December in Saint Petersburg?

In Saint Petersburg, during December, snow falls for 17 days.

What is the water temperature in December in Saint Petersburg?

In Saint Petersburg, Russia, the average seawater temperature in December is 2.8°C (37°F). For swimming, this is considered very dangerous and immediately life-threatening. Total loss of breathing control instantly occurs, and clear thinking becomes almost impossible. A specialized swimsuit is obligatory to minimize thermal loss.

What is the month with the shortest days in Saint Petersburg?

With an average of 6h and 6min of daylight, December has the shortest days of the year in Saint Petersburg, Russia.

How many hours of daylight does Saint Petersburg have in December?

The average day length in December is 6h and 4min.

What time are sunrise and sunset in December in Saint Petersburg?

On the first day of December in Saint Petersburg, Russia, 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.

What is the month with the least sunshine in Saint Petersburg?

With an average of 0.4h of sunshine, December has the least sunshine of the year in Saint Petersburg, Russia.

How long on average sun shines in December in Saint Petersburg?

The average sunshine duration in December in Saint Petersburg, Russia, is 0.4h.

What are the months with the lowest UV index in Saint Petersburg?

The months with the lowest UV index in Saint Petersburg, Russia, are January, November and December, with an average maximum UV index of 0.

What is the UV index reading in December in Saint Petersburg?

In December, the average daily maximum UV index is 0. A UV Index estimate of 2, and below, represents a low health risk from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average UV index

Average temperature in December
Saint Petersburg, Russia

Average temperature in December - Saint Petersburg, Russia
  • Average high temperature in December: -1.5°C

The warmest month (with the highest average high temperature) is July (23°C).
The months with the lowest average high temperature are January and February (-3°C).

  • Average low temperature in December: -6.1°C

The month with the highest average low temperature is July (15°C).
The coldest month (with the lowest average low temperature) is February (-8.5°C).

Average humidity in December
Saint Petersburg, Russia

Average humidity in December - Saint Petersburg, Russia
  • Average humidity in December: 87%

The month with the highest relative humidity is December (87%).
The month with the lowest relative humidity is May (65%).

Average rainfall in December
Saint Petersburg, Russia

Average rainfall in December - Saint Petersburg, Russia
  • Average rainfall in December: 51mm

The wettest month (with the highest rainfall) is August (83mm).
The driest month (with the least rainfall) is April (31mm).

Average rainfall days in December
Saint Petersburg, Russia

Average rainfall days in December - Saint Petersburg, Russia
  • Average rainfall days in December: 10 days

The months with the highest number of rainy days are September and October (20 days).
The month with the least rainy days is February (7 days).

Average snowfall days in December
Saint Petersburg, Russia

Average snowfall days in December - Saint Petersburg, Russia
  • Average snowfall days in December: 17 days

The months with the highest number of snowfall days are January, February and December (17 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average sea temperature in December
Saint Petersburg, Russia

Average sea temperature in December - Saint Petersburg, Russia
  • Average sea temperature in December: 2.8°C

The best month for swimming (with the highest average sea temperature) is July (19°C).
The coldest month (with the lowest average sea temperature) is February (-0.3°C).

Average daylight in December /
Average sunshine in December
Saint Petersburg, Russia

Average daylight in December / Average sunshine in December - Saint Petersburg, Russia
  • Average daylight in December: 6h and 1min

The month with the longest days is June (Average daylight: 18h and 42min).
The month with the shortest days is December (Average daylight: 6h and 6min).

  • Average sunshine in December: 0h and 2min

The month with the most sunshine is June (Average sunshine: 9h and 12min).
The month with the least sunshine is December (Average sunshine: 0h and 24min).

Average UV index in December
Saint Petersburg, Russia

Average UV index in December - Saint Petersburg, Russia
  • Average UV index in December: 0

The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, November and December (UV index 0).

Saint Petersburg, Russia

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