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
The advent of December denotes an average high-temperature of a still frosty 45°F, subtly different from November's 48.2°F. Rostrevor records a consistent average nighttime temperature of 39.2°F in December, slightly lower than the daytime high.Humidity
December is the most humid month, with an average relative humidity of 88%.Rainfall
In Rostrevor, in December, it is raining for 14.8 days, with typically 1.69" of accumulated precipitation. Throughout the year, there are 199.5 rainfall days, and 22.32" of precipitation is accumulated.Snowfall
Months with snowfall are January through April, November and December. In December, it is snowing for 2.3 days. Throughout December, 0.51" of snow is accumulated. Throughout the year, there are 13.2 snowfall days, and 5.04" of snow is accumulated.Sea temperature
In Rostrevor, in December, the average water temperature is 51.6°F.Note: It is advised against swimming in 51.6°F when it drops below 50°F. Such temperatures can cause extreme cold shock, leading to hyperventilation.
Daylight
With an average of 7h and 30min of daylight, December has the shortest days of the year in Rostrevor.On the first day of the month, sunrise is at 8:21 am and sunset at 4:06 pm. On the last day of December, sunrise is at 8:44 am and sunset at 4:11 pm GMT.
Sunshine
In Rostrevor, the average sunshine in December is 4.2h.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 value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: In December, an average UV index of 2 transforms into the following instructions:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in December?
What is the most humid month?
What is the average humidity in December?
How much does it rain in December?
How much does it snow in December?
How cold is the water in December?
What is the month with the shortest days?
What is the average length of the day in December?
When is the sunrise / sunset in December?
How long on average sun shines in December?
When is the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Rostrevor, United Kingdom
- Average high temperature in December: 45°F
The warmest months (with the highest average high temperature) are July and August (61.5°F).
The month with the lowest average high temperature is January (44.1°F).
- Average low temperature in December: 39.2°F
The month with the highest average low temperature is August (52.7°F).
The coldest month (with the lowest average low temperature) is February (37.6°F).
Average pressure in December
Rostrevor, United Kingdom
- Average pressure in December: 29.82"Hg
The month with the highest atmospheric pressure is May (29.99"Hg).
The month with the lowest atmospheric pressure is November (29.75"Hg).
Average wind speed in December
Rostrevor, United Kingdom
- Average wind speed in December: 14.1mph
The windiest month (with the highest average wind speed) is January (14.2mph).
The calmest months (with the lowest average wind speed) are June and July (8.8mph).
Average humidity in December
Rostrevor, United Kingdom
- Average humidity in December: 88%
The month with the highest relative humidity is December (88%).
The months with the lowest relative humidity are March, April and May (84%).
Average rainfall in December
Rostrevor, United Kingdom
- Average rainfall in December: 1.69"
The wettest month (with the highest rainfall) is August (2.6").
The driest months (with the least rainfall) are January and April (1.38").
Average rainfall days in December
Rostrevor, United Kingdom
- Average rainfall days in December: 14.8 days
The month with the highest number of rainy days is August (21.6 days).
The month with the least rainy days is February (13.5 days).
Average snowfall in December
Rostrevor, United Kingdom
- Average snowfall in December: 0.51"
The month with the highest snowfall is February (1.57").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Rostrevor, United Kingdom
- Average snowfall days in December: 2.3 days
The month with the highest number of snowfall days is February (3.7 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in December
Rostrevor, United Kingdom
- Average sea temperature in December: 51.6°F
The best month for swimming (with the highest average sea temperature) is August (58.4°F).
The coldest month (with the lowest average sea temperature) is March (47°F).
Average daylight in December /
Average sunshine in December
Rostrevor, United Kingdom
- Average daylight in December: 7h and 3min
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: 4h and 1min
The month with the most sunshine is June (Average sunshine: 7h and 36min).
The month with the least sunshine is February (Average sunshine: 3h and 48min).
Average sunshine days in December
Rostrevor, United Kingdom
- Average sunshine days in December: 11.9 days
The months with the most sunshine days are January and November (12 days).
The month with the least sunshine days is August (6.1 days).
Average UV index in December
Rostrevor, 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
Rostrevor, United Kingdom
- Average cloud cover in December: 57
The months with the most cloud cover are January and February (Cloud cover 61).
The month with the least cloud cover is April (Cloud cover 52).
Average visibility in December
Rostrevor, United Kingdom
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
