April weather forecast
Harpenden, United Kingdom

April

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).

Temperature

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). Throughout April, an average nighttime temperature of 4.7°C (40.5°F) is experienced.

Humidity

The average relative humidity in April is 81%.

Rainfall

In Harpenden, in April, it is raining for 13.4 days, with typically 21mm (0.83") of accumulated precipitation. Throughout the year, in Harpenden, there are 160.5 rainfall days, and 325mm (12.8") of precipitation is accumulated.

Snowfall

Months with snowfall in Harpenden are January through April, November and December. April is the last month it regularly snows. During 0.5 snowfall days, in April, Harpenden aggregates 1mm (0.04") of snow. Throughout the year, in Harpenden, there are 10.3 snowfall days, and 81mm (3.19") of snow is accumulated.

Daylight

In April, the average length of the day in Harpenden, United Kingdom, is 13h and 55min.
On the first day of April, sunrise is at 6:34 am and sunset at 7:35 pm. On the last day of the month, sunrise is at 5:32 am and sunset at 8:24 pm BST.

Sunshine

In April, the average sunshine is 7.4h.

UV index

The average daily maximum UV index in April is 3. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for average individuals.
Note: The maximum UV index of 3 during April leads to these instructions:
Guard yourself - An obligation to protect skin and eyes from harm exists. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Keep in mind! Snow's reflective quality can nearly double the intensity of the Sun's UV radiation.

Frequently asked questions

What is the average April temperature in Harpenden?
During April, Harpenden experiences an average high-temperature of 13.3°C (55.9°F) and a low-temperature of 4.7°C (40.5°F).
What is the average humidity in April in Harpenden?
In Harpenden, United Kingdom, the average relative humidity in April is 81%.
How many days does it rain in April in Harpenden?
In Harpenden, during April, the rain falls for 13.4 days and regularly aggregates up to 21mm (0.83") of precipitation.
What is the last month it snows in Harpenden?
April is the last month it regularly snows. During 0.5 snowfall days, in April, Harpenden aggregates 1mm (0.04") of snow.
How many hours of daylight does Harpenden have in April?
In April, the average day length is 13h and 55min.
When is the sunrise / sunset in April in Harpenden?
On the first day of April, sunrise is at 6:34 am and sunset at 7:35 pm. On the last day of the month, sunrise is at 5:32 am and sunset at 8:24 pm BST.
How many hours of sunshine does Harpenden have in April?
The average sunshine duration in April in Harpenden, United Kingdom, is 7.4h.
What is the UV index intensity in April in Harpenden?
In April, the average daily maximum UV index in Harpenden, United Kingdom, is 3. A UV Index of 3 to 5 symbolizes a moderate vulnerability from exposure to the Sun's UV radiation.
Average high temperature
Average low temperature
Average wind speed
Average max. wind speed
Average wind speed gusts
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
Average temperature in April - Harpenden, United Kingdom
Average temperature in April
Harpenden, United Kingdom
  • Average high temperature in April: 13.3°C

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).

  • Average low temperature in April: 4.7°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 in April - Harpenden, United Kingdom
Average pressure in April
Harpenden, United Kingdom
  • Average pressure in April: 1015.6mbar

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 in April - Harpenden, United Kingdom
Average wind speed in April
Harpenden, United Kingdom
  • Average wind speed in April: 13.9km/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 in April - Harpenden, United Kingdom
Average humidity in April
Harpenden, United Kingdom
  • Average humidity in April: 81%

The month with the highest relative humidity is December (90%).
The month with the lowest relative humidity is August (77%).

Average rainfall in April - Harpenden, United Kingdom
Average rainfall in April
Harpenden, United Kingdom
  • Average rainfall in April: 21mm

The wettest month (with the highest rainfall) is June (43mm).
The driest month (with the least rainfall) is September (19mm).

Average rainfall days in April - Harpenden, United Kingdom
Average rainfall days in April
Harpenden, United Kingdom
  • Average rainfall days in April: 13.4 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 in April - Harpenden, United Kingdom
Average snowfall in April
Harpenden, United Kingdom
  • Average snowfall in April: 1mm

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 in April - Harpenden, United Kingdom
Average snowfall days in April
Harpenden, United Kingdom
  • Average snowfall days in April: 0.5 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 in April / Average sunshine in April - Harpenden, United Kingdom
Average daylight in April /
Average sunshine in April
Harpenden, United Kingdom
  • Average daylight in April: 13h 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 April: 7h and 2min

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 in April - Harpenden, United Kingdom
Average sunshine days in April
Harpenden, United Kingdom
  • Average sunshine days in April: 12.9 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 in April - Harpenden, United Kingdom
Average UV index in April
Harpenden, United Kingdom
  • Average UV index in April: 3

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 in April - Harpenden, United Kingdom
Average cloud cover in April
Harpenden, United Kingdom
  • Average cloud cover in April: 51

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 in April - Harpenden, United Kingdom
Average visibility in April
Harpenden, United Kingdom
  • Average visibility in April: 9km

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).

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