December weather forecastHämeenlinna, Finland

December

Weather in December

December ushers in the prime of winter in Hämeenlinna, with a huge jump in snowfall reaching 143mm (5.63"), the maximum annual measurement. The city plunges into the white glory of winter, with trees surrendering to the frosty cover. The skeletal daylight duration of only 5.7 hours signals the Winter Solstice, resulting in the shortest day of the year. Meanwhile, the low visibility and high humidity add to the authentic winter atmosphere. Thus, December offers Hämeenlinna a transforming climatic change, painting the city into a winter wonderland, and paving the way for a new beginning.

Temperature

The arrival of December corresponds with a minor reduction in the average high-temperature, down from November's cold 2.3°C (36.1°F) to a subzero cold -1.5°C (29.3°F). Nighttime in Hämeenlinna, during December, brings an average low of -4.8°C (23.4°F), a modest reduction from the day's peak.

Humidity

The average relative humidity in December is 93%.

Rainfall

In Hämeenlinna, in December, it is raining for 7.1 days, with typically 34mm (1.34") of accumulated precipitation. Throughout the year, there are 129.3 rainfall days, and 403mm (15.87") of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall. In December, it is snowing for 16.5 days. Throughout December, 143mm (5.63") of snow is accumulated. In Hämeenlinna, during the entire year, snow falls for 90.6 days and aggregates up to 766mm (30.16") of snow.

Daylight

December has the shortest days of the year, with an average of 5h and 42min of daylight.
On the first day of the month, sunrise is at 09:06 and sunset at 15:16. On the last day of December, in Hämeenlinna, sunrise is at 09:34 and sunset at 15:16 EET.

Sunshine

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

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 reading of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The maximum daily UV index of 1 in December converts into the following recommendations:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.

Updated: Jan 31, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

An average high-temperature, in December, in Hämeenlinna, is -1.5°C (29.3°F) and the average low-temperature is -4.8°C (23.4°F).

In Hämeenlinna, Finland, the average relative humidity in December is 93%.

In Hämeenlinna, in December, during 7.1 rainfall days, 34mm (1.34") of precipitation is typically accumulated.

In Hämeenlinna, in December, during 16.5 snowfall days, 143mm (5.63") of snow is typically accumulated.

With an average of 5h and 42min of daylight, December has the shortest days of the year.

In Hämeenlinna, the average day length in December is 5h and 43min.

In December, on the first day of the month, sunrise is at 09:06 and sunset at 15:16. On the last day of the month, in Hämeenlinna, sunrise is at 09:34 and sunset at 15:16 EET.

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

In December, the average sunshine duration in Hämeenlinna is 1.4h.

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

In Hämeenlinna, 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 exposure to Sun's UV rays.

Today

Tomorrow

Long-term

Year J F M A M J J A S O N December

Nov

December

Jan

Average high temperature

2.3°C

-1.5°C

-4.4°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

11.6km/h

12.6km/h

12.1km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average sunshine days

10.5

12.2

Average UV index

Average cloud cover

Average visibility

Average temperature in December
Hämeenlinna, Finland

Average high temperature in December: -1.5°C

The warmest month (with the highest average high temperature) is July (21.8°C).
The month with the lowest average high temperature is January (-4.4°C).

Average low temperature in December: -4.8°C

The month with the highest average low temperature is July (12.1°C).
The coldest month (with the lowest average low temperature) is January (-8.5°C).

Average pressure in December
Hämeenlinna, Finland

Average pressure in December: 1008mbar

The month with the highest atmospheric pressure is May (1014.8mbar).
The month with the lowest atmospheric pressure is December (1008mbar).

Average wind speed in December
Hämeenlinna, 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 (9.6km/h).

Average humidity in December
Hämeenlinna, Finland

Average humidity in December: 93%

The month with the highest relative humidity is February (95%).
The month with the lowest relative humidity is May (66%).

Average rainfall in December
Hämeenlinna, Finland

Average rainfall in December: 34mm

The wettest month (with the highest rainfall) is July (54mm).
The driest months (with the least rainfall) are March and April (25mm).

Average rainfall days in December
Hämeenlinna, Finland

Average rainfall days in December: 7.1 days

The month with the highest number of rainy days is July (18.1 days).
The month with the least rainy days is February (3.3 days).

Average snowfall in December
Hämeenlinna, Finland

Average snowfall in December: 143mm

The month with the highest snowfall is January (157mm).
The months with the least snowfall are June, July, August and September (0mm).

Average snowfall days in December
Hämeenlinna, Finland

Average snowfall days in December: 16.5 days

The month with the highest number of snowfall days is January (18.6 days).
The months with the least snowfall days are June, July and August (0 days).

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

Average daylight in December: 5h and 42min

The month with the longest days is June (Average daylight: 19h and 6min).
The month with the shortest days is December (Average daylight: 5h and 42min).

Average sunshine in December: 1h and 24min

The month with the most sunshine is June (Average sunshine: 11h and 12min).
The month with the least sunshine is December (Average sunshine: 1h and 24min).

Average sunshine days in December
Hämeenlinna, Finland

Average sunshine days in December: 10.5 days

The month with the most sunshine days is May (15.9 days).
The month with the least sunshine days is March (9.4 days).

Average UV index in December
Hämeenlinna, Finland

Average UV index in December: 1

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

Average cloud cover in December
Hämeenlinna, Finland

Average cloud cover in December: 78

The months with the most cloud cover are January and February (Cloud cover 80).
The months with the least cloud cover are May, June, July and August (Cloud cover 47).