Climate and monthly weather forecastHarwell, United Kingdom
Climate and monthly weather forecast
Weather in January
January, the same as December, in Harwell, United Kingdom, is another chilly winter month, with an average temperature ranging between min 1.4°C (34.5°F) and max 6.4°C (43.5°F). During the coldest month, January, temperatures average a high of 6.4°C (43.5°F) and a low of 1.4°C (34.5°F). Weather in January »Weather in February
The last month of the winter, February, is another chilly month in Harwell, United Kingdom, with an average temperature varying between 1.8°C (35.2°F) and 7°C (44.6°F). As Harwell transitions into February, the average high-temperature stands at a still chilly 7°C (44.6°F), offering little variation from the preceding month. Weather in February »Weather in March
The first month of the spring, March, is still a chilly month in Harwell, United Kingdom, with temperature in the range of an average high of 9.9°C (49.8°F) and an average low of 2.5°C (36.5°F). March reports an average high-temperature of a still frosty 9.9°C (49.8°F), slightly varied from February's 7°C (44.6°F). Weather in March »Weather in April
April is a mild spring month in Harwell, United Kingdom, with temperature in the range of an average high of 13.1°C (55.6°F) and an average low of 4.1°C (39.4°F). With the onset of April, Harwell experiences a subtle temperature shift, with the average high-temperature moving from a frosty 9.9°C (49.8°F) in March to a mild 13.1°C (55.6°F). Weather in April »Weather in May
May, the last month of the spring in Harwell, is another mild month, with an average temperature ranging between max 15.5°C (59.9°F) and min 6.5°C (43.7°F). The onset of May brings an average high-temperature of a still refreshing 15.5°C (59.9°F), nearly matching the April temperature. Weather in May »Weather in June
June, the first month of the summer in Harwell, is a comfortable month, with temperature in the range of an average high of 18.3°C (64.9°F) and an average low of 9.5°C (49.1°F). June's onset records a minor alteration in the average high-temperature to a still refreshing 18.3°C (64.9°F) from May's 15.5°C (59.9°F). Weather in June »Weather in July
July in Harwell, United Kingdom, is an agreeable summer month, with an average temperature ranging between max 20.7°C (69.3°F) and min 12°C (53.6°F). July brings the highest temperatures, with an average high of 20.7°C (69.3°F) and an average low of 12°C (53.6°F). Weather in July »Weather in August
The last month of the summer, August, is also an agreeable month in Harwell, United Kingdom, with an average temperature fluctuating between 20.2°C (68.4°F) and 12.3°C (54.1°F). Harwell observes an average high-temperature of a still agreeable 20.2°C (68.4°F) in August, barely different from 20.7°C (69.3°F) in July. Weather in August »Weather in September
The first month of the autumn, September, is still a comfortable month in Harwell, United Kingdom, with temperature in the range of an average high of 18°C (64.4°F) and an average low of 10°C (50°F). Welcoming September, Harwell notes an average high-temperature of an enjoyable 18°C (64.4°F), nearly consistent with August's 20.2°C (68.4°F). Weather in September »Weather in October
October, like September, is another mild autumn month in Harwell, United Kingdom, with an average temperature ranging between max 14.2°C (57.6°F) and min 8°C (46.4°F). The onset of October entails a subtle temperature shift, as the average high-temperature eases from a comfortable 18°C (64.4°F) in September to a moderate 14.2°C (57.6°F). Weather in October »Weather in November
The last month of the autumn, November, is another chilly month in Harwell, United Kingdom, with an average temperature ranging between max 9.5°C (49.1°F) and min 4.9°C (40.8°F). November brings a slight decrease in the average high-temperature, shifting from a refreshing 14.2°C (57.6°F) in October to a chilly 9.5°C (49.1°F). Weather in November »Weather in December
The first month of the winter, December, is also a frosty month in Harwell, United Kingdom, with an average temperature ranging between max 7.3°C (45.1°F) and min 2.7°C (36.9°F). As Harwell steps into December, the average high-temperature is measured at a still frosty 7.3°C (45.1°F), displaying minor differences from November's 9.5°C (49.1°F). 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
January is the month when Harwell sees the average lowest temperatures, with a high of 6.4°C (43.5°F) and a low of 1.4°C (34.5°F).
In Harwell, United Kingdom, during the entire year, the rain falls for 156.1 days and collects up to 332mm (13.07") of precipitation.
January through March, November and December are months with snowfall in Harwell, United Kingdom.
Throughout the year, there are 8.5 snowfall days, and 42mm (1.65") of snow is accumulated.
The months with the lowest UV index in Harwell are January, February, November and December, with an average maximum UV index of 2.
The month with the most snowfall in Harwell, United Kingdom, is February, when snow falls for 3.3 days and typically aggregates up to 19mm (0.75") of snow.
February has the least sunshine of the year in Harwell, United Kingdom, with an average of 3.7h of sunshine.
April through October are months without snowfall in Harwell.
May through September, with an average maximum UV index of 4, are months with the highest UV index.
The wettest months are June, August and November, with an average 35mm (1.38") of rainfall.
The month with the longest days in Harwell is June, with an average of 16h and 36min of daylight.
The temperatures reach their highest averages in July, with highs of 20.7°C (69.3°F) and lows of 12°C (53.6°F).
July and August, with an average relative humidity of 80%, are the least humid months in Harwell.
The month with the most sunshine in Harwell is July, with an average of 7.7h of sunshine.
The month with the least rainfall is September, when the rain falls for 9.8 days and typically collects 17mm (0.67") of precipitation.
On Sunday, 27. October 2024, at 2:00 am, Daylight Saving Time ends, 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.
December is the most humid month in Harwell, with an average relative humidity of 91%.
With an average of 7h and 54min of daylight, December has the shortest days of the year in Harwell.
Average temperature
Harwell, United Kingdom
The warmest month (with the highest average high temperature) is July (20.7°C).
The month with the lowest average high temperature is January (6.4°C).
The month with the highest average low temperature is August (12.3°C).
The coldest month (with the lowest average low temperature) is January (1.4°C).
Average pressure
Harwell, United Kingdom
- Average pressure in January:
1014.2mbar - Average pressure in February:
1013.6mbar - Average pressure in March:
1015.3mbar - Average pressure in April:
1015.6mbar - Average pressure in May:
1016.7mbar - Average pressure in June:
1016mbar
- Average pressure in July:
1015.1mbar - Average pressure in August:
1014.6mbar - Average pressure in September:
1016.7mbar - Average pressure in October:
1014.8mbar - Average pressure in November:
1010.2mbar - 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 (1010.2mbar).
Average wind speed
Harwell, United Kingdom
- Average wind speed in January:
17.5km/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:
13.5km/h - Average wind speed in June:
13km/h
- Average wind speed in July:
12.9km/h - Average wind speed in August:
13.3km/h - Average wind speed in September:
13.2km/h - Average wind speed in October:
15.2km/h - Average wind speed in November:
16.5km/h - Average wind speed in December:
18km/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
Harwell, United Kingdom
The month with the highest relative humidity is December (91%).
The months with the lowest relative humidity are July and August (80%).
Average rainfall
Harwell, United Kingdom
The wettest months (with the highest rainfall) are June, August and November (35mm).
The driest month (with the least rainfall) is September (17mm).
Average rainfall days
Harwell, United Kingdom
- Average rainfall days in January:
10.3 days - Average rainfall days in February:
11.4 days - Average rainfall days in March:
12.5 days - Average rainfall days in April:
14.2 days - Average rainfall days in May:
14.6 days - Average rainfall days in June:
15.3 days
- Average rainfall days in July:
16.8 days - Average rainfall days in August:
15.1 days - Average rainfall days in September:
9.8 days - Average rainfall days in October:
12 days - Average rainfall days in November:
12.5 days - Average rainfall days in December:
11.6 days
The month with the highest number of rainy days is July (16.8 days).
The month with the least rainy days is September (9.8 days).
Average snowfall
Harwell, United Kingdom
The month with the highest snowfall is February (19mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days
Harwell, United Kingdom
- Average snowfall days in January:
1.9 days - Average snowfall days in February:
3.3 days - Average snowfall days in March:
1.1 days - Average snowfall days in April:
0.2 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:
0.4 days - Average snowfall days in December:
1.6 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
Harwell, 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 36min - 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 42min - Average daylight in November:
8h and 54min - 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 36min - Average sunshine in April:
7h and 12min - Average sunshine in May:
7h and 12min - Average sunshine in June:
7h and 18min
- Average sunshine in July:
7h and 42min - Average sunshine in August:
7h and 24min - Average sunshine in September:
7h and 0min - Average sunshine in October:
4h and 24min - Average sunshine in November:
3h and 48min - Average sunshine in December:
4h and 12min
The month with the most sunshine is July (Average sunshine: 7h and 42min).
The month with the least sunshine is February (Average sunshine: 3h and 42min).
Average sunshine days
Harwell, United Kingdom
- Average sunshine days in January:
16.9 days - Average sunshine days in February:
12.6 days - Average sunshine days in March:
15.1 days - Average sunshine days in April:
13.1 days - Average sunshine days in May:
12.4 days - Average sunshine days in June:
10.3 days
- Average sunshine days in July:
10.8 days - Average sunshine days in August:
12.1 days - Average sunshine days in September:
18 days - Average sunshine days in October:
16 days - Average sunshine days in November:
14.9 days - Average sunshine days in December:
16.3 days
The month with the most sunshine days is September (18 days).
The month with the least sunshine days is June (10.3 days).
Average UV index
Harwell, United Kingdom
The months with the highest UV index are May, June, July, 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
Harwell, United Kingdom
The month with the most cloud cover is November (Cloud cover 63).
The month with the least cloud cover is September (Cloud cover 51).
Average visibility
Harwell, United Kingdom
The months with the highest visibility are January, February, March, May, June, July, August, October and December (9km).
The months with the lowest visibility are April, September and November (8km).
