December weather forecastSejny, Poland
December
Weather in December
December, the first month of the winter in Sejny, is also a wintry month, with an average temperature varying between -2.8°C (27°F) and 0.7°C (33.3°F).Temperature
December's onset introduces a mild reduction in the average high-temperature, from 5.5°C (41.9°F) in November to a still cold 0.7°C (33.3°F). In Sejny, a slight decrease from the daytime peak is noted during the month of December, with an average low-temperature of -2.8°C (27°F).Humidity
In Sejny, the average relative humidity in December is 90%.Rainfall
In Sejny, in December, during 12.2 rainfall days, 39mm (1.54") of precipitation is typically accumulated. In Sejny, during the entire year, the rain falls for 177.2 days and collects up to 539mm (21.22") of precipitation.Snowfall
Months with snowfall are January through May, October through December. In December, in Sejny, Poland, it is snowing for 15.3 days. Throughout December, 134mm (5.28") of snow is accumulated. In Sejny, during the entire year, snow falls for 72.5 days and aggregates up to 622mm (24.49") of snow.Daylight
With an average of 7h and 30min of daylight, December has the shortest days of the year in Sejny, Poland.On the first day of December in Sejny, sunrise is at 07:23 and sunset at 15:08. On the last day of the month, sunrise is at 07:46 and sunset at 15:13 CET.
Sunshine
In Sejny, the average sunshine in December is 2.6h.UV index
The months with the lowest UV index in Sejny, Poland, are January, February, November and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for the average person.Note: The maximum UV index, 1 during December, leads to the following recommendations:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Sejny, Poland
- Average high temperature in December: 0.7°C
The warmest month (with the highest average high temperature) is July (23.3°C).
The month with the lowest average high temperature is January (-2°C).
- Average low temperature in December: -2.8°C
The months with the highest average low temperature are July and August (12.8°C).
The coldest month (with the lowest average low temperature) is January (-5.7°C).
Average pressure in December
Sejny, Poland
- Average pressure in December: 1014.6mbar
The month with the highest atmospheric pressure is October (1017.7mbar).
The month with the lowest atmospheric pressure is July (1013mbar).
Average wind speed in December
Sejny, Poland
- Average wind speed in December: 14.7km/h
The windiest month (with the highest average wind speed) is December (14.7km/h).
The calmest month (with the lowest average wind speed) is August (10.5km/h).
Average humidity in December
Sejny, Poland
- Average humidity in December: 90%
The month with the highest relative humidity is January (92%).
The month with the lowest relative humidity is April (71%).
Average rainfall in December
Sejny, Poland
- Average rainfall in December: 39mm
The wettest month (with the highest rainfall) is July (74mm).
The driest month (with the least rainfall) is April (30mm).
Average rainfall days in December
Sejny, Poland
- Average rainfall days in December: 12.2 days
The month with the highest number of rainy days is July (22.8 days).
The month with the least rainy days is February (7.8 days).
Average snowfall in December
Sejny, Poland
- Average snowfall in December: 134mm
The month with the highest snowfall is January (168mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in December
Sejny, Poland
- Average snowfall days in December: 15.3 days
The month with the highest number of snowfall days is January (18.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Sejny, Poland
- Average daylight in December: 7h and 30min
The month with the longest days is June (Average daylight: 17h and 6min).
The month with the shortest days is December (Average daylight: 7h and 30min).
- Average sunshine in December: 2h and 36min
The month with the most sunshine is June (Average sunshine: 10h and 18min).
The months with the least sunshine are January and February (Average sunshine: 2h and 24min).
Average sunshine days in December
Sejny, Poland
- Average sunshine days in December: 7.7 days
The month with the most sunshine days is October (14.1 days).
The month with the least sunshine days is July (5.8 days).
Average UV index in December
Sejny, Poland
- Average UV index in December: 1
The months with the highest UV index are May, June and July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover in December
Sejny, Poland
- Average cloud cover in December: 75
The months with the most cloud cover are January and February (Cloud cover 78).
The month with the least cloud cover is August (Cloud cover 37).
Average visibility in December
Sejny, Poland
- Average visibility in December: 8km
The months with the highest visibility are April, May, June, July, August, September and October (9km).
The months with the lowest visibility are January and February (7km).
