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 sea temperature 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
As December takes its course, Portstewart's average high-temperature registers at a still frosty 7.5°C (45.5°F), closely aligning with the preceding month. The nights of December are characterized by an average low-temperature of 4.7°C (40.5°F), subtly descending from daytime highs.Humidity
In December, the average relative humidity is 84%.Rainfall
In Portstewart, during December, the rain falls for 20.9 days and regularly aggregates up to 51mm (2.01") of precipitation. Throughout the year, in Portstewart, there are 238.3 rainfall days, and 632mm (24.88") of precipitation is accumulated.Snowfall
January through April, November and December are months with snowfall. In Portstewart, in December, snow falls for 1.4 days, with typically accumulated 7mm (0.28") of snow. In Portstewart, during the entire year, snow falls for 8 days and aggregates up to 47mm (1.85") of snow.Sea temperature
In Portstewart, the average seawater temperature in December is 10.6°C (51.1°F).Note: Staying in 10.6°C (51.1°F) waters for just a few moments at 13°C (55.4°F) can be harrowing, and below 10°C (50°F) poses breathing and cold shock risks, depending on individual tolerance.
Daylight
The month with the shortest days in Portstewart is December, with an average of 7h and 12min of daylight.On the first day of December in Portstewart, sunrise is at 8:29 am and sunset at 4:02 pm. On the last day of the month, sunrise is at 8:52 am and sunset at 4:07 pm GMT.
Sunshine
In December, the average sunshine is 4h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for the average person.Note: The maximum UV index of 2 during December translates into these guidelines:
Although prolonged sun exposure does not typically bother most people, children, babies, and those with sensitive skin should always have protection. To protect against the Sun's most potent rays, avoid direct exposure around midday. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Portstewart in December?
What is the average humidity in December in Portstewart?
How much does it rain in Portstewart in December?
How much does it snow in Portstewart in December?
What is the sea water temperature in December in Portstewart?
What is the month with the shortest days in Portstewart?
What is the average length of the day in December in Portstewart?
What time are sunrise and sunset in December in Portstewart?
How many hours of sunshine does Portstewart have in December?
What is the month with the lowest UV index in Portstewart?
What is the UV index reading in December in Portstewart?
Average temperature in December
Portstewart, United Kingdom
- Average high temperature in December: 7.5°C
The warmest month (with the highest average high temperature) is July (16°C).
The month with the lowest average high temperature is January (7.1°C).
- Average low temperature in December: 4.7°C
The month with the highest average low temperature is August (11.8°C).
The coldest month (with the lowest average low temperature) is February (4°C).
Average pressure in December
Portstewart, United Kingdom
- Average pressure in December: 1008.2mbar
The month with the highest atmospheric pressure is May (1015.2mbar).
The month with the lowest atmospheric pressure is November (1006.6mbar).
Average wind speed in December
Portstewart, United Kingdom
- Average wind speed in December: 27km/h
The windiest month (with the highest average wind speed) is January (27.5km/h).
The calmest month (with the lowest average wind speed) is July (16.7km/h).
Average humidity in December
Portstewart, United Kingdom
- Average humidity in December: 84%
The months with the highest relative humidity are July and August (86%).
The month with the lowest relative humidity is April (81%).
Average rainfall in December
Portstewart, United Kingdom
- Average rainfall in December: 51mm
The wettest months (with the highest rainfall) are July and August (74mm).
The driest month (with the least rainfall) is April (35mm).
Average rainfall days in December
Portstewart, United Kingdom
- Average rainfall days in December: 20.9 days
The month with the highest number of rainy days is August (24 days).
The month with the least rainy days is April (16.8 days).
Average snowfall in December
Portstewart, United Kingdom
- Average snowfall in December: 7mm
The month with the highest snowfall is February (16mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in December
Portstewart, United Kingdom
- Average snowfall days in December: 1.4 days
The month with the highest number of snowfall days is February (2.5 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in December
Portstewart, United Kingdom
- Average sea temperature in December: 10.6°C
The best month for swimming (with the highest average sea temperature) is August (14.3°C).
The coldest month (with the lowest average sea temperature) is March (8.3°C).
Average daylight in December /
Average sunshine in December
Portstewart, United Kingdom
- Average daylight in December: 7h and 1min
The month with the longest days is June (Average daylight: 17h and 18min).
The month with the shortest days is December (Average daylight: 7h and 12min).
- Average sunshine in December: 4h and 0min
The month with the most sunshine is June (Average sunshine: 8h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in December
Portstewart, United Kingdom
- Average sunshine days in December: 6.2 days
The month with the most sunshine days is April (9.8 days).
The month with the least sunshine days is August (4.2 days).
Average UV index in December
Portstewart, United Kingdom
- Average UV index in December: 2
The months with the highest UV index are May, June, August and September (UV index 4).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Portstewart, United Kingdom
- Average cloud cover in December: 62
The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is April (Cloud cover 52).
Average visibility in December
Portstewart, United Kingdom
- Average visibility in December: 9km
The month with the highest visibility is November (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October and December (9km).
