Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
December
Weather in December
Temperature
The average high-temperature shows a slight dip in December, from November's wintry 4.5°C (40.1°F) to a still cold 1°C (33.8°F). Köyliö sees a minor drop to an average minimum temperature of -1.5°C (29.3°F) during the night in the month of December.Humidity
In December, the average relative humidity in Köyliö is 87%.Rainfall
In December, the rain falls for 11.3 days. Throughout December, 42mm (1.65") of precipitation is accumulated. In Köyliö, during the entire year, the rain falls for 135.2 days and collects up to 422mm (16.61") of precipitation.Snowfall
Months with snowfall are January through May, October through December. In Köyliö, in December, snow falls for 11.9 days, with typically accumulated 79mm (3.11") of snow. In Köyliö, during the entire year, snow falls for 58.1 days and aggregates up to 382mm (15.04") of snow.Daylight
With an average of 5h and 42min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 09:16 and sunset at 15:23. On the last day of December, in Köyliö, sunrise is at 09:44 and sunset at 15:23 EET.
Sunshine
The months with the least sunshine in Köyliö are January and December, with an average of 2.1h of sunshine.UV index
January through March 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 vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: The maximum UV index of 1 during December translates into these guidelines:
Most people face no serious problems with extended sun exposure, but those with fair skin, infants, and children always need protection. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in Köyliö in December?
What is the average humidity in December in Köyliö?
How many days does it rain in December in Köyliö?
How much does it snow in Köyliö in December?
What is the month with the shortest days in Köyliö?
What is the average length of the day in December in Köyliö?
When is the sunrise / sunset in December in Köyliö?
What is the month with the least sunshine in Köyliö?
How many hours of sunshine does Köyliö have in December?
When is the lowest UV index in Köyliö?
What is the UV index intensity in December in Köyliö?
Average temperature in December
Köyliö, Finland
- Average high temperature in December: 1°C
The warmest month (with the highest average high temperature) is July (19.7°C).
The months with the lowest average high temperature are January and February (-1.5°C).
- Average low temperature in December: -1.5°C
The month with the highest average low temperature is August (14°C).
The coldest month (with the lowest average low temperature) is February (-5°C).
Average pressure in December
Köyliö, Finland
- Average pressure in December: 1006.9mbar
The month with the highest atmospheric pressure is May (1014.8mbar).
The month with the lowest atmospheric pressure is December (1006.9mbar).
Average wind speed in December
Köyliö, Finland
- Average wind speed in December: 20.7km/h
The windiest month (with the highest average wind speed) is December (20.7km/h).
The calmest month (with the lowest average wind speed) is July (14.5km/h).
Average humidity in December
Köyliö, Finland
- Average humidity in December: 87%
The month with the highest relative humidity is February (91%).
The month with the lowest relative humidity is May (71%).
Average rainfall in December
Köyliö, Finland
- Average rainfall in December: 42mm
The wettest month (with the highest rainfall) is July (56mm).
The driest month (with the least rainfall) is April (21mm).
Average rainfall days in December
Köyliö, Finland
- Average rainfall days in December: 11.3 days
The month with the highest number of rainy days is July (15.8 days).
The month with the least rainy days is February (4.3 days).
Average snowfall in December
Köyliö, Finland
- Average snowfall in December: 79mm
The month with the highest snowfall is March (88mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in December
Köyliö, Finland
- Average snowfall days in December: 11.9 days
The month with the highest number of snowfall days is March (13 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Köyliö, Finland
- Average daylight in December: 5h and 4min
The month with the longest days is June (Average daylight: 19h and 12min).
The month with the shortest days is December (Average daylight: 5h and 42min).
- Average sunshine in December: 2h and 1min
The month with the most sunshine is June (Average sunshine: 12h and 18min).
The months with the least sunshine are January and December (Average sunshine: 2h and 6min).
Average sunshine days in December
Köyliö, Finland
- Average sunshine days in December: 10.7 days
The month with the most sunshine days is June (16.8 days).
The month with the least sunshine days is December (10.7 days).
Average UV index in December
Köyliö, Finland
- Average UV index in December: 1
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, March and December (UV index 1).
Average cloud cover in December
Köyliö, Finland
- Average cloud cover in December: 70
The month with the most cloud cover is January (Cloud cover 71).
The months with the least cloud cover are July and August (Cloud cover 36).
Average visibility in December
Köyliö, Finland
- Average visibility in December: 9km
The months with the highest visibility are May, June, July, August and September (10km).
The months with the lowest visibility are January, February and March (8km).
