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
Greencastle experiences an average high-temperature of a still chilly 6.7°C (44.1°F) with the onset of December, subtly varied from November's 8.8°C (47.8°F). Greencastle's evenings during December maintain an average temperature of 3.3°C (37.9°F), aligning closely with the daytime temperatures.Humidity
The months with the highest humidity are January, August and December, with an average relative humidity of 88%.Rainfall
In Greencastle, in December, it is raining for 19.8 days, with typically 46mm (1.81") of accumulated precipitation. In Greencastle, during the entire year, the rain falls for 216.1 days and collects up to 529mm (20.83") of precipitation.Snowfall
January through March, November and December are months with snowfall. In December, in Greencastle, it is snowing for 1.4 days. Throughout December, 7mm (0.28") of snow is accumulated. Throughout the year, there are 8.5 snowfall days, and 69mm (2.72") of snow is accumulated.Daylight
With an average of 7h and 12min of daylight, December has the shortest days of the year in Greencastle.On the first day of December, sunrise is at 8:30 am and sunset at 4:03 pm. On the last day of the month, sunrise is at 8:53 am and sunset at 4:08 pm GMT.
Sunshine
In Greencastle, the average sunshine in December is 3.7h.UV index
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for average individuals.Note: An average maximum UV index of 2 in December leads to these recommendations:
While most people are not greatly affected by extended sun exposure, those with fair skin, babies, and children must always have protection. To protect against the Sun's most potent rays, avoid direct exposure around midday. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is it cold in Greencastle during December?
What are the most humid months in Greencastle?
What is the average humidity in December in Greencastle?
How much does it rain in Greencastle in December?
How many days does it snow in December in Greencastle?
What is the month with the shortest days in Greencastle?
How many hours of daylight does Greencastle have in December?
When are sunrise and sunset in December in Greencastle?
How many hours of sunshine does Greencastle have in December?
When is the lowest UV index in Greencastle?
What is the UV index intensity in December in Greencastle?
Average temperature in December
Greencastle, Ireland
- Average high temperature in December: 6.7°C
The warmest month (with the highest average high temperature) is July (16.5°C).
The month with the lowest average high temperature is January (6.3°C).
- Average low temperature in December: 3.3°C
The month with the highest average low temperature is August (10.4°C).
The coldest month (with the lowest average low temperature) is February (2.3°C).
Average pressure in December
Greencastle, Ireland
- Average pressure in December: 1008.3mbar
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
Greencastle, Ireland
- Average wind speed in December: 21.1km/h
The windiest month (with the highest average wind speed) is January (21.9km/h).
The calmest month (with the lowest average wind speed) is July (13.8km/h).
Average humidity in December
Greencastle, Ireland
- Average humidity in December: 88%
The months with the highest relative humidity are January, August and December (88%).
The month with the lowest relative humidity is April (82%).
Average rainfall in December
Greencastle, Ireland
- Average rainfall in December: 46mm
The wettest month (with the highest rainfall) is August (60mm).
The driest month (with the least rainfall) is September (29mm).
Average rainfall days in December
Greencastle, Ireland
- Average rainfall days in December: 19.8 days
The month with the highest number of rainy days is August (21.5 days).
The month with the least rainy days is April (15.7 days).
Average snowfall in December
Greencastle, Ireland
- Average snowfall in December: 7mm
The months with the highest snowfall are January and February (21mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in December
Greencastle, Ireland
- Average snowfall days in December: 1.4 days
The month with the highest number of snowfall days is February (2.7 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Greencastle, Ireland
- 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: 3h and 4min
The month with the most sunshine is June (Average sunshine: 6h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in December
Greencastle, Ireland
- Average sunshine days in December: 7.5 days
The month with the most sunshine days is April (11.1 days).
The month with the least sunshine days is August (6.3 days).
Average UV index in December
Greencastle, Ireland
- Average UV index in December: 2
The months with the highest UV index are May and June (UV index 4).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in December
Greencastle, Ireland
- Average cloud cover in December: 66
The month with the most cloud cover is July (Cloud cover 68).
The month with the least cloud cover is April (Cloud cover 58).
Average visibility in December
Greencastle, Ireland
- Average visibility in December: 9km
The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (9km).
The month with the lowest visibility is July (8km).
