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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Climate and monthly weather forecast
Weather in January
January, the same as December, in Harpenden, United Kingdom, is another chilly winter month, with temperature in the range of an average high of 6.3°C (43.3°F) and an average low of 1.6°C (34.9°F). Harpenden's January weather, marked by an average high temperature of 6.3°C (43.3°F) and an average low temperature of 1.6°C (34.9°F), is the coldest in the year. Weather in January »
Weather in February
February, the last month of the winter in Harpenden, is also a frosty month, with an average temperature fluctuating between 2°C (35.6°F) and 6.9°C (44.4°F). February welcomes an average high-temperature of a still chilly 6.9°C (44.4°F), not much different from the preceding month. Weather in February »
Weather in March
March, the first month of the spring in Harpenden, is a cool month, with an average temperature fluctuating between 10°C (50°F) and 2.8°C (37°F). Harpenden's transition into March is marked by a minor temperature shift, moving from a chilly 6.9°C (44.4°F) in February to a fresh 10°C (50°F). Weather in March »
Weather in April
April is a moderate spring month in Harpenden, United Kingdom, with temperature in the range of an average low of 4.7°C (40.5°F) and an average high of 13.3°C (55.9°F). A slight uplift of average high-temperatures is noted in April, with temperatures adjusting from a cool 10°C (50°F) in March to a moderate 13.3°C (55.9°F). Weather in April »
Weather in May
May, the last month of the spring in Harpenden, is another refreshing month, with an average temperature ranging between min 7.1°C (44.8°F) and max 15.8°C (60.4°F). Harpenden experiences a subtle adjustment in high-temperatures to a still mild 15.8°C (60.4°F) with the onset of May, maintaining near parity with April's 13.3°C (55.9°F). Weather in May »
Weather in June
June, the first month of the summer in Harpenden, is a refreshing month, with temperature in the range of an average low of 10.1°C (50.2°F) and an average high of 18.8°C (65.8°F). As Harpenden enters June, the average high-temperature marginally increases from the a mild 15.8°C (60.4°F) of May to an enjoyable 18.8°C (65.8°F). Weather in June »
Weather in July
July is a pleasant summer month in Harpenden, United Kingdom, with an average temperature varying between 21.3°C (70.3°F) and 12.5°C (54.5°F). Harpenden's temperature records reveal July as the warmest month, marked by average highs of 21.3°C (70.3°F) and lows of 12.5°C (54.5°F). Weather in July »
Weather in August
The last month of the summer, August, is also an agreeable month in Harpenden, United Kingdom, with temperature in the range of an average high of 20.9°C (69.6°F) and an average low of 13.2°C (55.8°F). The shift into August records an average high-temperature of a still agreeable 20.9°C (69.6°F), subtly varied from July's 21.3°C (70.3°F). Weather in August »
Weather in September
September, the first month of the autumn in Harpenden, is still a refreshing month, with an average temperature fluctuating between 10.7°C (51.3°F) and 18.4°C (65.1°F). The shift into September uncovers an average high-temperature of a comfortable 18.4°C (65.1°F), subtly different from the previous month. Weather in September »
Weather in October
October, the same as September, in Harpenden, United Kingdom, is another refreshing autumn month, with an average temperature ranging between min 8.6°C (47.5°F) and max 14.5°C (58.1°F). Harpenden observes a small decrease in the average high-temperature with the arrival of October, falling from September's refreshing 18.4°C (65.1°F) to a mild 14.5°C (58.1°F). Weather in October »
Weather in November
The last month of the autumn, November, is another chilly month in Harpenden, United Kingdom, with an average temperature fluctuating between 5.2°C (41.4°F) and 9.6°C (49.3°F). November witnesses a gentle descent in average high-temperature, descending from October's mild 14.5°C (58.1°F) to a chilly 9.6°C (49.3°F). Weather in November »
Weather in December
The first month of the winter, December, is still a chilly month in Harpenden, United Kingdom, with temperature in the range of an average high of 7.2°C (45°F) and an average low of 2.9°C (37.2°F). With December's arrival, Harpenden's weather records an average high-temperature of a still frosty 7.2°C (45°F), marking little difference from November's 9.6°C (49.3°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
What part of the year is the coldest in Harpenden?
With average high and low temperatures of 6.3°C (43.3°F) and 1.6°C (34.9°F) respectively, January is Harpenden's coldest month.
How many days does it rain in Harpenden?
In Harpenden, United Kingdom, during the entire year, the rain falls for 160.5 days and collects up to 325mm (12.8") of precipitation.
When does it snow in Harpenden?
January through April, November and December are months with snowfall in Harpenden.
How much does it snow in Harpenden?
In Harpenden, during the entire year, snow falls for 10.3 days and aggregates up to 81mm (3.19") of snow.
What are the months with the lowest UV index in Harpenden?
The months with the lowest UV index in Harpenden, United Kingdom, are January, February, November and December, with an average maximum UV index of 2.
What is the snowiest month in Harpenden?
The month with the most snowfall in Harpenden is February, when snow falls for 3.6 days and typically aggregates up to 29mm (1.14") of snow.
What is the month with the least sunshine in Harpenden?
February has the least sunshine of the year in Harpenden, United Kingdom, with an average of 3.7h of sunshine.
When it does not snow in Harpenden?
May through October are months without snowfall.
What is the rainiest month in Harpenden?
June is the month with the most rainfall. Rain falls for 14.5 days and accumulates 43mm (1.69") of precipitation.
When are the longest days in Harpenden?
June has the longest days of the year, with an average of 16h and 36min of daylight.
What is the hottest time of year in Harpenden?
In Harpenden, the peak average temperatures are observed in July, with a high of 21.3°C (70.3°F) and a low of 12.5°C (54.5°F).
What is the month with the most sunshine in Harpenden?
The months with the most sunshine in Harpenden, United Kingdom, are July and August, with an average of 7.8h of sunshine.
What is the month with the highest UV index in Harpenden?
With an average maximum UV index of 5, July is the month with the highest UV index in Harpenden.
What is the least humid month in Harpenden?
The least humid month in Harpenden, United Kingdom, is August, with an average relative humidity of 77%.
What is the driest month in Harpenden?
September is the month with the least rainfall in Harpenden. Rain falls for 10.9 days and accumulates 19mm (0.75") of precipitation.
When is Daylight Saving Time (DST) in Harpenden?
On Sunday, 27. October 2024, at 2:00 am, Daylight Saving Time ends in Harpenden, 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.
What is the most humid month in Harpenden?
The most humid month is December, with an average relative humidity of 90%.
What is the month with the shortest days in Harpenden?
The month with the shortest days in Harpenden, United Kingdom, is December, with an average of 7h and 54min of daylight.
Average temperature
Harpenden, United Kingdom
The warmest month (with the highest average high temperature) is July (21.3°C).
The month with the lowest average high temperature is January (6.3°C).
The month with the highest average low temperature is August (13.2°C).
The coldest month (with the lowest average low temperature) is January (1.6°C).
Average pressure
Harpenden, United Kingdom
- Average pressure in January:
1014.2mbar - Average pressure in February:
1013.5mbar - 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:
1014.9mbar - Average pressure in November:
1010.3mbar - Average pressure in December:
1014mbar
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
Harpenden, United Kingdom
- Average wind speed in January:
17.7km/h - Average wind speed in February:
18.4km/h - Average wind speed in March:
16.7km/h - Average wind speed in April:
13.9km/h - Average wind speed in May:
13.7km/h - Average wind speed in June:
13.2km/h
- Average wind speed in July:
12.9km/h - Average wind speed in August:
13.5km/h - Average wind speed in September:
13.3km/h - Average wind speed in October:
15.5km/h - Average wind speed in November:
16.6km/h - Average wind speed in December:
18.4km/h
The windiest months (with the highest average wind speed) are February and December (18.4km/h).
The calmest month (with the lowest average wind speed) is July (12.9km/h).
Average humidity
Harpenden, United Kingdom
The month with the highest relative humidity is December (90%).
The month with the lowest relative humidity is August (77%).
Average rainfall
Harpenden, United Kingdom
The wettest month (with the highest rainfall) is June (43mm).
The driest month (with the least rainfall) is September (19mm).
Average rainfall days
Harpenden, United Kingdom
- Average rainfall days in January:
11.8 days - Average rainfall days in February:
10.8 days - Average rainfall days in March:
12.3 days - Average rainfall days in April:
13.4 days - Average rainfall days in May:
14.7 days - Average rainfall days in June:
14.5 days
- Average rainfall days in July:
16.8 days - Average rainfall days in August:
15.4 days - Average rainfall days in September:
10.9 days - Average rainfall days in October:
13.1 days - Average rainfall days in November:
13.9 days - Average rainfall days in December:
12.9 days
The month with the highest number of rainy days is July (16.8 days).
The month with the least rainy days is February (10.8 days).
Average snowfall
Harpenden, United Kingdom
The month with the highest snowfall is February (29mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days
Harpenden, United Kingdom
- Average snowfall days in January:
3.2 days - Average snowfall days in February:
3.6 days - Average snowfall days in March:
0.8 days - Average snowfall days in April:
0.5 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:
0.2 days - Average snowfall days in December:
2 days
The month with the highest number of snowfall days is February (3.6 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Harpenden, United Kingdom
- Average daylight in January:
8h and 2min - Average daylight in February:
10h and 0min - Average daylight in March:
11h and 5min - Average daylight in April:
13h and 5min - Average daylight in May:
15h and 4min - Average daylight in June:
16h and 4min
- Average daylight in July:
16h and 1min - Average daylight in August:
14h and 4min - Average daylight in September:
12h and 4min - Average daylight in October:
10h and 4min - Average daylight in November:
8h and 5min - Average daylight in December:
7h and 5min
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 1min - Average sunshine in February:
3h and 4min - Average sunshine in March:
5h and 4min - Average sunshine in April:
7h and 2min - Average sunshine in May:
7h and 1min - Average sunshine in June:
7h and 1min
- Average sunshine in July:
7h and 5min - Average sunshine in August:
7h and 5min - Average sunshine in September:
7h and 0min - Average sunshine in October:
4h and 2min - Average sunshine in November:
4h and 0min - Average sunshine in December:
4h and 1min
The months with the most sunshine are July and August (Average sunshine: 7h and 48min).
The month with the least sunshine is February (Average sunshine: 3h and 42min).
Average sunshine days
Harpenden, United Kingdom
- Average sunshine days in January:
13.2 days - Average sunshine days in February:
12 days - Average sunshine days in March:
15.1 days - Average sunshine days in April:
12.9 days - Average sunshine days in May:
12.1 days - Average sunshine days in June:
10.9 days
- Average sunshine days in July:
9.7 days - Average sunshine days in August:
11.8 days - Average sunshine days in September:
15 days - Average sunshine days in October:
13.9 days - Average sunshine days in November:
12.6 days - Average sunshine days in December:
13.5 days
The month with the most sunshine days is March (15.1 days).
The month with the least sunshine days is July (9.7 days).
Average UV index
Harpenden, United Kingdom
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover
Harpenden, United Kingdom
The months with the most cloud cover are February and November (Cloud cover 61).
The month with the least cloud cover is September (Cloud cover 49).
Average visibility
Harpenden, United Kingdom
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October and December (9km).
The month with the lowest visibility is November (8km).
