Climate and monthly weather forecastWelwyn, United Kingdom
Climate and monthly weather forecast
Weather in January
January, the same as December, in Welwyn, United Kingdom, is a frosty winter month, with an average temperature ranging between max 6.3°C (43.3°F) and min 1.6°C (34.9°F). January is Welwyn's coldest month, registering average high temperatures of 6.3°C (43.3°F) and lows of 1.6°C (34.9°F). Weather in January »Weather in February
February, the last month of the winter in Welwyn, is also a frosty month, with temperature in the range of an average low of 2°C (35.6°F) and an average high of 7°C (44.6°F). February's climate shows a minor adjustment in average high-temperatures to a still frosty 7°C (44.6°F) from January's 6.3°C (43.3°F). Weather in February »Weather in March
March, the first month of the spring in Welwyn, is a cool month, with an average temperature varying between 10.1°C (50.2°F) and 3°C (37.4°F). With the onset of March, Welwyn's weather sees a minor temperature rise, transitioning from a chilly 7°C (44.6°F) in February to a fresh 10.1°C (50.2°F). Weather in March »Weather in April
April is a refreshing spring month in Welwyn, United Kingdom, with an average temperature varying between 4.8°C (40.6°F) and 13.6°C (56.5°F). As March transitions into April, a subtle temperature shift is observed, with average highs adjusting from a fresh 10.1°C (50.2°F) to a moderate 13.6°C (56.5°F). Weather in April »Weather in May
May, the last month of the spring in Welwyn, is also a moderate month, with an average temperature varying between 15.9°C (60.6°F) and 7°C (44.6°F). Welwyn's weather, upon May's arrival, documents an average high-temperature of a still moderate 15.9°C (60.6°F), nearly identical to the prior month. Weather in May »Weather in June
The first month of the summer, June, is a refreshing month in Welwyn, United Kingdom, with temperature in the range of an average low of 10.3°C (50.5°F) and an average high of 18.9°C (66°F). The shift into June records an average high-temperature of a comfortable 18.9°C (66°F), subtly varied from May's 15.9°C (60.6°F). Weather in June »Weather in July
July is a pleasant summer month in Welwyn, United Kingdom, with an average temperature varying between 12.5°C (54.5°F) and 21.4°C (70.5°F). The highest temperatures are recorded in July, with averages reaching a high of 21.4°C (70.5°F) and a low of 12.5°C (54.5°F). Weather in July »Weather in August
The last month of the summer, August, is another pleasant month in Welwyn, United Kingdom, with an average temperature varying between 13.3°C (55.9°F) and 21.3°C (70.3°F). With the transition into August, Welwyn notes an average high-temperature of a still agreeable 21.3°C (70.3°F), closely resembling July. Weather in August »Weather in September
The first month of the autumn, September, is still a refreshing month in Welwyn, United Kingdom, with an average temperature varying between 18.5°C (65.3°F) and 10.9°C (51.6°F). With the arrival of September, Welwyn's average high-temperature registers at a comfortable 18.5°C (65.3°F), indicating a subtle variation from the previous month. Weather in September »Weather in October
October, like September, is a moderate autumn month in Welwyn, United Kingdom, with an average temperature varying between 14.5°C (58.1°F) and 8.6°C (47.5°F). As October commences, the average high-temperature subtly reduces, transitioning from a refreshing 18.5°C (65.3°F) in September to a mild 14.5°C (58.1°F). Weather in October »Weather in November
November, the last month of the autumn in Welwyn, is another chilly month, with an average temperature varying between 5.4°C (41.7°F) and 9.9°C (49.8°F). The arrival of November is marked by a minor reduction in average high-temperature, sliding from a moderate 14.5°C (58.1°F) in October to a chilly 9.9°C (49.8°F). Weather in November »Weather in December
The first month of the winter, December, is also a frosty month in Welwyn, United Kingdom, with an average temperature fluctuating between 2.9°C (37.2°F) and 7.2°C (45°F). The transition from November to December sees an average high-temperature of a still chilly 7.2°C (45°F), indicating a minor variance from the prior month. Weather in December »Updated: Feb 8, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Welwyn's coldest month, January, generally records average temperatures ranging from a high of 6.3°C (43.3°F) to a low of 1.6°C (34.9°F).
Throughout the year, in Welwyn, United Kingdom, there are 153.2 rainfall days, and 278mm (10.94") of precipitation is accumulated.
January through March, November and December are months with snowfall in Welwyn.
Throughout the year, in Welwyn, United Kingdom, there are 10 snowfall days, and 51mm (2.01") of snow is accumulated.
The months with the lowest UV index in Welwyn, United Kingdom, are January, February, November and December, with an average maximum UV index of 2.
The month with the most snowfall in Welwyn is February, when snow falls for 3.3 days and typically aggregates up to 16mm (0.63") of snow.
The month with the least sunshine in Welwyn is February, with an average of 3.7h of sunshine.
In Welwyn, snow does not fall in April through October.
June is the month with the most rainfall in Welwyn, United Kingdom. Rain falls for 13.8 days and accumulates 36mm (1.42") of precipitation.
June has the longest days of the year, with an average of 16h and 36min of daylight.
The months with the highest UV index in Welwyn, United Kingdom, are June and July, with an average maximum UV index of 5.
In Welwyn, July registers the highest temperatures, averaging 21.4°C (70.5°F) at the peak and 12.5°C (54.5°F) at the lowest.
July and August, with an average of 7.9h of sunshine, are months with the most sunshine.
With an average relative humidity of 75%, August is the least humid month.
The month with the least rainfall in Welwyn is September, when the rain falls for 10.5 days and typically collects 15mm (0.59") of precipitation.
On Sunday, 27. October 2024, at 2:00 am, Daylight Saving Time ends in Welwyn, United Kingdom, and the time zone changes from BST to GMT. The next Daylight Saving Time starts on Sunday, 30. March 2025, at 1:00 am, and the time zone reverts from GMT to BST.
With an average relative humidity of 90%, December is the most humid month in Welwyn, United Kingdom.
December has the shortest days of the year in Welwyn, United Kingdom, with an average of 7h and 54min of daylight.
Average temperature
Welwyn, United Kingdom
The warmest month (with the highest average high temperature) is July (21.4°C).
The month with the lowest average high temperature is January (6.3°C).
The month with the highest average low temperature is August (13.3°C).
The coldest month (with the lowest average low temperature) is January (1.6°C).
Average pressure
Welwyn, United Kingdom
- Average pressure in January:
1014.2mbar - Average pressure in February:
1013.6mbar - Average pressure in March:
1015.3mbar - Average pressure in April:
1015.7mbar - Average pressure in May:
1016.7mbar - Average pressure in June:
1016.1mbar
- Average pressure in July:
1015.1mbar - Average pressure in August:
1014.6mbar - Average pressure in September:
1016.7mbar - Average pressure in October:
1014.9mbar - Average pressure in November:
1010.3mbar - Average pressure in December:
1014.1mbar
The months with the highest atmospheric pressure are May and September (1016.7mbar).
The month with the lowest atmospheric pressure is November (1010.3mbar).
Average wind speed
Welwyn, United Kingdom
- Average wind speed in January:
17.6km/h - Average wind speed in February:
18.3km/h - Average wind speed in March:
16.6km/h - Average wind speed in April:
13.8km/h - Average wind speed in May:
13.7km/h - Average wind speed in June:
13.1km/h
- Average wind speed in July:
12.9km/h - Average wind speed in August:
13.4km/h - Average wind speed in September:
13.2km/h - Average wind speed in October:
15.3km/h - Average wind speed in November:
16.5km/h - Average wind speed in December:
18.2km/h
The windiest month (with the highest average wind speed) is February (18.3km/h).
The calmest month (with the lowest average wind speed) is July (12.9km/h).
Average humidity
Welwyn, United Kingdom
The month with the highest relative humidity is December (90%).
The month with the lowest relative humidity is August (75%).
Average rainfall
Welwyn, United Kingdom
The wettest month (with the highest rainfall) is June (36mm).
The driest month (with the least rainfall) is September (15mm).
Average rainfall days
Welwyn, United Kingdom
- Average rainfall days in January:
11.6 days - Average rainfall days in February:
10.8 days - Average rainfall days in March:
11.8 days - Average rainfall days in April:
13.8 days - Average rainfall days in May:
13.8 days - Average rainfall days in June:
13.8 days
- Average rainfall days in July:
16.6 days - Average rainfall days in August:
14.3 days - Average rainfall days in September:
10.5 days - Average rainfall days in October:
11.3 days - Average rainfall days in November:
12.5 days - Average rainfall days in December:
12.4 days
The month with the highest number of rainy days is July (16.6 days).
The month with the least rainy days is September (10.5 days).
Average snowfall
Welwyn, United Kingdom
The month with the highest snowfall is February (16mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days
Welwyn, United Kingdom
- Average snowfall days in January:
3 days - Average snowfall days in February:
3.3 days - Average snowfall days in March:
1 days - Average snowfall days in April:
0.3 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0.3 days - Average snowfall days in December:
2.1 days
The month with the highest number of snowfall days is February (3.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Welwyn, United Kingdom
- Average daylight in January:
8h and 24min - Average daylight in February:
10h and 0min - Average daylight in March:
11h and 54min - Average daylight in April:
13h and 54min - Average daylight in May:
15h and 42min - Average daylight in June:
16h and 36min
- Average daylight in July:
16h and 6min - Average daylight in August:
14h and 36min - Average daylight in September:
12h and 36min - Average daylight in October:
10h and 36min - Average daylight in November:
8h and 48min - Average daylight in December:
7h and 54min
The month with the longest days is June (Average daylight: 16h and 36min).
The month with the shortest days is December (Average daylight: 7h and 54min).
- Average sunshine in January:
4h and 12min - Average sunshine in February:
3h and 42min - Average sunshine in March:
5h and 30min - Average sunshine in April:
7h and 42min - Average sunshine in May:
7h and 24min - Average sunshine in June:
7h and 24min
- Average sunshine in July:
7h and 54min - Average sunshine in August:
7h and 54min - Average sunshine in September:
7h and 12min - Average sunshine in October:
4h and 30min - Average sunshine in November:
4h and 0min - Average sunshine in December:
4h and 18min
The months with the most sunshine are July and August (Average sunshine: 7h and 54min).
The month with the least sunshine is February (Average sunshine: 3h and 42min).
Average sunshine days
Welwyn, United Kingdom
- Average sunshine days in January:
15.2 days - Average sunshine days in February:
13.6 days - Average sunshine days in March:
15.8 days - Average sunshine days in April:
13.3 days - Average sunshine days in May:
12.8 days - Average sunshine days in June:
11.7 days
- Average sunshine days in July:
11.1 days - Average sunshine days in August:
13.4 days - Average sunshine days in September:
16.5 days - Average sunshine days in October:
15.9 days - Average sunshine days in November:
13.6 days - Average sunshine days in December:
14.7 days
The month with the most sunshine days is September (16.5 days).
The month with the least sunshine days is July (11.1 days).
Average UV index
Welwyn, United Kingdom
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover
Welwyn, United Kingdom
The month with the most cloud cover is February (Cloud cover 61).
The month with the least cloud cover is September (Cloud cover 48).
Average visibility
Welwyn, United Kingdom
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
