Contents
- Weather in May
- Frequently asked questions
- Average temperature in May
- Average pressure in May
- Average wind speed in May
- Average humidity in May
- Average rainfall in May
- Average rainfall days in May
- Average snowfall in May
- Average snowfall days in May
- Average sea temperature in May
- Average daylight in May
- Average sunshine in May
- Average sunshine days in May
- Average UV index in May
- Average cloud cover in May
- Average visibility in May
May
Weather in May
Temperature
May's commencement is accompanied by an average high-temperature of a moderate 13.6°C (56.5°F), diverging marginally from April's 11.3°C (52.3°F). Nighttime temperatures in Gretna consistently average a wintry 5.6°C (42.1°F) during May.Humidity
The average relative humidity in May is 83%.Rainfall
In Gretna, in May, it is raining for 15.9 days, with typically 28mm (1.1") of accumulated precipitation. Throughout the year, in Gretna, there are 204.6 rainfall days, and 478mm (18.82") of precipitation is accumulated.Snowfall
May through November are months without snowfall.Sea temperature
In Gretna, the average seawater temperature in May is 10.5°C (50.9°F).Note: Swimming in 10.5°C (50.9°F) can be lethal. Merely spending a few minutes in 13°C (55.4°F) waters feels harsh, and venturing below 10°C (50°F) might disrupt breathing control and bring about cold shock, contingent on individual resilience.
Daylight
The average length of the day in May is 16h and 10min.On the first day of the month, sunrise is at 5:30 am and sunset at 8:48 pm. On the last day of May, in Gretna, sunrise is at 4:41 am and sunset at 9:39 pm BST.
Sunshine
With an average of 7.5h of sunshine, May has the most sunshine of the year.UV index
May through August, with an average maximum UV index of 4, are months with the highest UV index. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for the ordinary person.Note: A typical high UV index of 4 in May suggests the following recommendations:
Guard yourself - An obligation to protect skin and eyes from harm exists. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average May temperature in Gretna?
What is the average humidity in May in Gretna?
How much does it rain in Gretna in May?
When it does not snow in Gretna?
Does it snow in Gretna in May?
What is the water temperature in May in Gretna?
How many hours of daylight does Gretna have in May?
When is the sunrise / sunset in May in Gretna?
What month has the most sunshine in Gretna?
How long on average sun shines in May in Gretna?
When is the highest UV index in Gretna?
How high is the UV index in May in Gretna?
Average temperature in May
Gretna, United Kingdom
- Average high temperature in May: 13.6°C
The warmest month (with the highest average high temperature) is July (17.5°C).
The month with the lowest average high temperature is January (5.2°C).
- Average low temperature in May: 5.6°C
The month with the highest average low temperature is August (10.3°C).
The coldest months (with the lowest average low temperature) are January and February (1.3°C).
Average pressure in May
Gretna, United Kingdom
- Average pressure in May: 1015.8mbar
The month with the highest atmospheric pressure is May (1015.8mbar).
The month with the lowest atmospheric pressure is November (1007.7mbar).
Average wind speed in May
Gretna, United Kingdom
- Average wind speed in May: 14.7km/h
The windiest month (with the highest average wind speed) is December (18.4km/h).
The calmest months (with the lowest average wind speed) are June and July (12.5km/h).
Average humidity in May
Gretna, United Kingdom
- Average humidity in May: 83%
The months with the highest relative humidity are January, November and December (89%).
The month with the lowest relative humidity is April (82%).
Average rainfall in May
Gretna, United Kingdom
- Average rainfall in May: 28mm
The wettest month (with the highest rainfall) is December (55mm).
The driest month (with the least rainfall) is April (18mm).
Average rainfall days in May
Gretna, United Kingdom
- Average rainfall days in May: 15.9 days
The month with the highest number of rainy days is August (19.9 days).
The month with the least rainy days is April (13.3 days).
Average snowfall in May
Gretna, United Kingdom
- Average snowfall in May: 0mm
The month with the highest snowfall is January (22mm).
The months with the least snowfall are May, June, July, August, September, October and November (0mm).
Average snowfall days in May
Gretna, United Kingdom
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is January (2.7 days).
The months with the least snowfall days are May, June, July, August, September, October and November (0 days).
Average sea temperature in May
Gretna, United Kingdom
- Average sea temperature in May: 10.5°C
The best month for swimming (with the highest average sea temperature) is August (15.8°C).
The coldest month (with the lowest average sea temperature) is February (7.1°C).
Average daylight in May /
Average sunshine in May
Gretna, United Kingdom
- Average daylight in May: 16h 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 18min).
- Average sunshine in May: 7h and 3min
The month with the most sunshine is May (Average sunshine: 7h and 30min).
The month with the least sunshine is February (Average sunshine: 3h and 48min).
Average sunshine days in May
Gretna, United Kingdom
- Average sunshine days in May: 11.2 days
The month with the most sunshine days is April (13 days).
The month with the least sunshine days is July (7.2 days).
Average UV index in May
Gretna, United Kingdom
- Average UV index in May: 4
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, March, November and December (UV index 2).
Average cloud cover in May
Gretna, United Kingdom
- Average cloud cover in May: 52
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is April (Cloud cover 51).
Average visibility in May
Gretna, United Kingdom
- Average visibility in May: 9km
The months with the highest visibility are January, February, March, April, May, October, November and December (9km).
The months with the lowest visibility are June, July, August and September (8km).
