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 arrival of December denotes a barely perceptible change in the average high-temperatures to a chilly 9.5°C (49.1°F) from November's 10.8°C (51.4°F). Portnahaven's nighttime average temperature in December subtly descends to a still frosty 7.4°C (45.3°F) from the daily highs.Humidity
The average relative humidity in December is 77%.Rainfall
December is the month with the most rainfall. Rain falls for 23.8 days and accumulates 74mm (2.91") of precipitation.Snowfall
February and December are months with snowfall in Portnahaven. December is the month with the most snowfall. Snow falls for 0.5 days and accumulates 2mm (0.08") of snow.Daylight
December has the shortest days of the year, with an average of 7h and 6min of daylight.On the first day of the month, sunrise is at 8:31 am and sunset at 3:58 pm. On the last day of December, in Portnahaven, sunrise is at 8:55 am and sunset at 4:03 pm GMT.
Sunshine
The average sunshine in December in Portnahaven is 3.7h.UV index
In Portnahaven, the average daily maximum UV index in December is 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for average individuals.Note: In December, the average maximum UV index of 3 translates into the following recommendations:
Act with care - Obligation to protect against skin and eye damage is highlighted. It's recommended to limit sun exposure when its radiation is at its peak during midday. Employ a wide-brim hat for potent defense against up to 50% of UV rays. 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
What is the temperature in December in Portnahaven?
What is the average humidity in December in Portnahaven?
What is the rainiest month in Portnahaven?
How much does it rain in Portnahaven in December?
When does it snow the most in Portnahaven?
When does it start to snow in Portnahaven?
What is the month with the shortest days in Portnahaven?
What is the average length of the day in December in Portnahaven?
What time are sunrise and sunset in December in Portnahaven?
How many hours of sunshine does Portnahaven have in December?
What is the UV index reading in December in Portnahaven?
Average temperature in December
Portnahaven, United Kingdom
- Average high temperature in December: 9.5°C
The warmest month (with the highest average high temperature) is August (15.3°C).
The month with the lowest average high temperature is February (7.8°C).
- Average low temperature in December: 7.4°C
The month with the highest average low temperature is August (13.4°C).
The coldest month (with the lowest average low temperature) is February (6°C).
Average pressure in December
Portnahaven, United Kingdom
- Average pressure in December: 1007.6mbar
The month with the highest atmospheric pressure is May (1015.1mbar).
The month with the lowest atmospheric pressure is November (1006.3mbar).
Average wind speed in December
Portnahaven, United Kingdom
- Average wind speed in December: 37.8km/h
The windiest month (with the highest average wind speed) is January (38km/h).
The calmest month (with the lowest average wind speed) is June (21.8km/h).
Average humidity in December
Portnahaven, United Kingdom
- Average humidity in December: 77%
The months with the highest relative humidity are June, July and August (84%).
The month with the lowest relative humidity is November (76%).
Average rainfall in December
Portnahaven, United Kingdom
- Average rainfall in December: 74mm
The wettest month (with the highest rainfall) is December (74mm).
The driest month (with the least rainfall) is April (24mm).
Average rainfall days in December
Portnahaven, United Kingdom
- Average rainfall days in December: 23.8 days
The month with the highest number of rainy days is December (23.8 days).
The month with the least rainy days is April (15.4 days).
Average snowfall in December
Portnahaven, United Kingdom
- Average snowfall in December: 2mm
The month with the highest snowfall is December (2mm).
The months with the least snowfall are January, March, April, May, June, July, August, September, October and November (0mm).
Average snowfall days in December
Portnahaven, United Kingdom
- Average snowfall days in December: 0.5 days
The month with the highest number of snowfall days is December (0.5 days).
The months with the least snowfall days are January, April, May, June, July, August, September, October and November (0 days).
Average daylight in December /
Average sunshine in December
Portnahaven, United Kingdom
- Average daylight in December: 7h and 1min
The month with the longest days is June (Average daylight: 17h and 24min).
The month with the shortest days is December (Average daylight: 7h and 6min).
- Average sunshine in December: 3h and 4min
The month with the most sunshine is June (Average sunshine: 8h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in December
Portnahaven, United Kingdom
- Average sunshine days in December: 4.4 days
The month with the most sunshine days is April (11.3 days).
The month with the least sunshine days is November (4.1 days).
Average UV index in December
Portnahaven, United Kingdom
- Average UV index in December: 3
The months with the highest UV index are May, June, July and August (UV index 4).
The months with the lowest UV index are January, February and November (UV index 2).
Average cloud cover in December
Portnahaven, United Kingdom
- Average cloud cover in December: 64
The month with the most cloud cover is January (Cloud cover 66).
The months with the least cloud cover are April and May (Cloud cover 51).
Average visibility in December
Portnahaven, United Kingdom
- Average visibility in December: 10km
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (10km).
The month with the lowest visibility is January (9km).
