December weather forecast and climate
Lahti, Finland

Weather in December

The first month of the winter, December, is still a freezing cold month in Lahti, Finland, with average temperature ranging between min -5.1°C (22.8°F) and max -1.4°C (29.5°F).

Temperature

In Lahti, Finland, the average high-temperature slightly decreases, from a cold 2.3°C (36.1°F) in November, to a subzero cold -1.4°C (29.5°F). In Lahti, the average low-temperature is -5.1°C (22.8°F).

Humidity

In Lahti, the average relative humidity is 94%.

Rainfall

In December, the rain falls for 8.2 days. Throughout December, 40mm (1.57") of precipitation is accumulated. In Lahti, during the entire year, the rain falls for 118.7 days and collects up to 398mm (15.67") of precipitation.

Snowfall

January through May, September through December are months with snowfall. In Lahti, during December, snow falls for 18.9 days and regularly aggregates up to 189mm (7.44") of snow. In Lahti, during the entire year, snow falls for 93.7 days, and aggregates up to 918mm (36.14") of snow.

Daylight

December has the shortest days of the year in Lahti, with an average of 5.7h of daylight.

Sunshine

With an average of 1.4h of sunshine, December has the least sunshine of the year in Lahti.

UV index

January through March, November and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a minimal health hazard from the exposure to the Sun's UV rays for ordinary individuals.
Note: In December, the average maximum UV index of 1 translate into the following recommendations:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in December in Lahti?

In Lahti, the average relative humidity in December is 94%.

How many days does it rain in December in Lahti?

In Lahti, in December, it is raining for 8.2 days, with typically 40mm (1.57") of accumulated precipitation.

How much does it snow in Lahti in December?

In December, in Lahti, it is snowing for 18.9 days. Throughout December, 189mm (7.44") of snow is accumulated.

What is the month with the shortest days in Lahti?

With an average of 5.7h of daylight, December has the shortest days of the year.

How many hours of daylight does Lahti have in December?

In December, the average length of the day in Lahti, Finland, is 5.7h.

What is the month with the least sunshine in Lahti?

The month with the least sunshine in Lahti is December, with an average of 1.4h of sunshine.

How long on average sun shines in December in Lahti?

In Lahti, Finland, the average sunshine in December is 1.4h.

What is the month with the lowest UV index in Lahti?

January through March, November and December, with an average maximum UV index of 1, are months with the lowest UV index in Lahti.

What is the UV index intensity in December in Lahti?

In Lahti, Finland, the average daily maximum UV index in December is 1. A UV Index estimate of 2, and below, represents a minimal hazard to health from the exposure to the Sun's UV rays.

Average temperature in December
Lahti, Finland

Average temperature in December - Lahti, Finland
  • Average high temperature in December: -1.4°C

The warmest month (with the highest average high temperature) is July (22°C).
The month with the lowest average high temperature is January (-4.5°C).

  • Average low temperature in December: -5.1°C

The month with the highest average low temperature is July (12.4°C).
The coldest month (with the lowest average low temperature) is January (-8.9°C).

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Average pressure in December
Lahti, Finland

Average pressure in December - Lahti, Finland
  • Average pressure in December: 1008.4mbar

The month with the highest atmospheric pressure is May (1014.8mbar).
The month with the lowest atmospheric pressure is December (1008.4mbar).

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Average wind speed in December
Lahti, Finland

Average wind speed in December - Lahti, Finland
  • Average wind speed in December: 12km/h

The windiest month (with the highest average wind speed) is December (12km/h).
The calmest month (with the lowest average wind speed) is August (9.4km/h).

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Average humidity in December
Lahti, Finland

Average humidity in December - Lahti, Finland
  • Average humidity in December: 94%

The month with the highest relative humidity is February (95%).
The month with the lowest relative humidity is May (67%).

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Average rainfall in December
Lahti, Finland

Average rainfall in December - Lahti, Finland
  • Average rainfall in December: 40mm

The wettest month (with the highest rainfall) is July (46mm).
The driest month (with the least rainfall) is April (24mm).

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Average rainfall days in December
Lahti, Finland

Average rainfall days in December - Lahti, Finland
  • Average rainfall days in December: 8.2 days

The month with the highest number of rainy days is July (14.3 days).
The month with the least rainy days is February (3.7 days).

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Average snowfall in December
Lahti, Finland

Average snowfall in December - Lahti, Finland
  • Average snowfall in December: 189mm

The month with the highest snowfall is January (196mm).
Months with the least snowfall are June, July and August (0mm).

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Average snowfall days in December
Lahti, Finland

Average snowfall days in December - Lahti, Finland
  • Average snowfall days in December: 18.9 days

Months with the highest number of snowfall days are January and December (18.9 days).
Months with the least snowfall days are June, July and August (0 days).

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Average daylight in December /
Average sunshine in December
Lahti, Finland

Average daylight in December / Average sunshine in December - Lahti, Finland
  • Average daylight in December: 5.7h

The month with the longest days is June (Average daylight: 19.1h).
The month with the shortest days is December (Average daylight: 5.7h).

  • Average sunshine in December: 1.4h

The month with the most sunshine is June (Average sunshine: 11.6h).
The month with the least sunshine is December (Average sunshine: 1.4h).

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Average sunshine days in December
Lahti, Finland

Average sunshine days in December - Lahti, Finland
  • Average sunshine days in December: 8.4 days

Months with the most sunshine days are May and August (17.6 days).
The month with the least sunshine days is December (8.4 days).

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Average UV index in December
Lahti, Finland

Average UV index in December - Lahti, Finland
  • Average UV index in December: 1

The month with the highest UV index is July (UV index 5).
Months with the lowest UV index are January, February, March, November and December (UV index 1).

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Average cloud cover in December
Lahti, Finland

Average cloud cover in December - Lahti, Finland
  • Average cloud cover in December: 80

Months with the most cloud cover are January and February (Cloud cover 81).
The month with the least cloud cover is August (Cloud cover 44).

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Average visibility in December
Lahti, Finland

Average visibility in December - Lahti, Finland
  • Average visibility in December: 6km

Months with the highest visibility are May, June, July and August (9km).
Months with the lowest visibility are January and February (5km).

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