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
Start of December brings a slight shift in the average high-temperature, dipping a bit from November's icy 2.5°C (36.5°F) to a subzero cold -1.2°C (29.8°F). A modest decline from daytime high temperatures in Nappa is noticed in December, marking the average low at -4.6°C (23.7°F).Humidity
The average relative humidity in December is 93%.Rainfall
In Nappa, Finland, during December, the rain falls for 8.4 days and regularly aggregates up to 46mm (1.81") of precipitation. Throughout the year, there are 132 rainfall days, and 453mm (17.83") of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. In Nappa, during December, snow falls for 21.2 days and regularly aggregates up to 224mm (8.82") of snow. Throughout the year, there are 104.4 snowfall days, and 1089mm (42.87") of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 5h and 48min of daylight.On the first day of December, sunrise is at 08:56 and sunset at 15:08. On the last day of the month, sunrise is at 09:24 and sunset at 15:09 EET.
Sunshine
The month with the least sunshine is December, with an average of 1.1h 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 low threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: In December, the maximum UV index of 1 translates into these guidelines:
Children must always have sun protection, unlike most people, who can tolerate up to an hour in the sun without any burns. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. 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. Take warning! The intensity of the Sun's UV radiation can be nearly amplified twice due to snow reflection.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in December?
What is the average humidity in December?
How many days does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
What is the average length of the day in December?
When are sunrise and sunset in December?
What is the month with the least sunshine?
How many hours of sunshine does Nappa have in December?
What are the months with the lowest UV index?
What is the UV index reading in December?
Average temperature in December
Nappa, Finland
- Average high temperature in December: -1.2°C
The warmest month (with the highest average high temperature) is July (21.6°C).
The month with the lowest average high temperature is January (-4.3°C).
- Average low temperature in December: -4.6°C
The month with the highest average low temperature is July (13°C).
The coldest month (with the lowest average low temperature) is January (-8.3°C).
Average pressure in December
Nappa, Finland
- Average pressure in December: 1008.7mbar
The month with the highest atmospheric pressure is May (1014.8mbar).
The month with the lowest atmospheric pressure is December (1008.7mbar).
Average wind speed in December
Nappa, Finland
- Average wind speed in December: 13.8km/h
The windiest month (with the highest average wind speed) is December (13.8km/h).
The calmest month (with the lowest average wind speed) is August (10.7km/h).
Average humidity in December
Nappa, 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 (68%).
Average rainfall in December
Nappa, Finland
- Average rainfall in December: 46mm
The wettest month (with the highest rainfall) is July (51mm).
The driest month (with the least rainfall) is April (25mm).
Average rainfall days in December
Nappa, Finland
- Average rainfall days in December: 8.4 days
The month with the highest number of rainy days is July (16.9 days).
The month with the least rainy days is February (3.5 days).
Average snowfall in December
Nappa, Finland
- Average snowfall in December: 224mm
The month with the highest snowfall is February (231mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in December
Nappa, Finland
- Average snowfall days in December: 21.2 days
The month with the highest number of snowfall days is January (21.3 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Nappa, Finland
- Average daylight in December: 5h and 5min
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 48min).
- Average sunshine in December: 1h and 1min
The month with the most sunshine is June (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 1h and 6min).
Average sunshine days in December
Nappa, Finland
- Average sunshine days in December: 5.5 days
The month with the most sunshine days is May (17.3 days).
The month with the least sunshine days is December (5.5 days).
Average UV index in December
Nappa, 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, November and December (UV index 1).
Average cloud cover in December
Nappa, Finland
- Average cloud cover in December: 79
The months with the most cloud cover are January and February (Cloud cover 80).
The months with the least cloud cover are July and August (Cloud cover 40).
Average visibility in December
Nappa, Finland
- Average visibility in December: 7km
The months with the highest visibility are May, June, July, August and September (9km).
The months with the lowest visibility are January, February and March (6km).
