Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average snowfall in January
- Average snowfall days in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
January
Weather in January
Temperature
January is the coldest month, with an average high-temperature of 6.8°C (44.2°F) and an average low-temperature of 1.9°C (35.4°F).Humidity
In January, the average relative humidity is 87%.Rainfall
The months with the least rainfall in Harmondsworth, United Kingdom, are January, March through May Rain falls for 6.8 days and accumulates 9mm (0.35") of rain.Snowfall
Months with snowfall are January through March and December. The months with the most snowfall in Harmondsworth are January and February, with an average 6mm (0.24") of accumulated snow.Daylight
The average length of the day in January is 8h and 27min.On the first day of January in Harmondsworth, United Kingdom, sunrise is at 8:07 am and sunset at 4:03 pm. On the last day of the month, sunrise is at 7:42 am and sunset at 4:48 pm GMT.
Sunshine
In January, the average sunshine is 4.2h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the ordinary person.Note: In January, the maximum UV index of 2 suggests these recommendations:
Despite the majority tolerating prolonged sun exposure, those with sensitive skin, infants, and children demand continual protection. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What month is the coldest in Harmondsworth?
Is it cold in Harmondsworth during January?
What is the average humidity in January in Harmondsworth?
What is the driest month in Harmondsworth?
How much does it rain in Harmondsworth in January?
When does it snow the most in Harmondsworth?
How much does it snow in Harmondsworth in January?
What is the average length of the day in January in Harmondsworth?
When is the sunrise / sunset in January in Harmondsworth?
How many hours of sunshine does Harmondsworth have in January?
When is the lowest UV index in Harmondsworth?
How high is the UV index in January in Harmondsworth?
Average temperature in January
Harmondsworth, United Kingdom
- Average high temperature in January: 6.8°C
The warmest month (with the highest average high temperature) is July (22°C).
The month with the lowest average high temperature is January (6.8°C).
- Average low temperature in January: 1.9°C
The month with the highest average low temperature is August (13.7°C).
The coldest month (with the lowest average low temperature) is January (1.9°C).
Average pressure in January
Harmondsworth, United Kingdom
- Average pressure in January: 1014.5mbar
The month with the highest atmospheric pressure is September (1016.9mbar).
The month with the lowest atmospheric pressure is November (1010.5mbar).
Average wind speed in January
Harmondsworth, United Kingdom
- Average wind speed in January: 16.6km/h
The windiest month (with the highest average wind speed) is February (17.5km/h).
The calmest months (with the lowest average wind speed) are July and September (12.7km/h).
Average humidity in January
Harmondsworth, United Kingdom
- Average humidity in January: 87%
The month with the highest relative humidity is December (89%).
The months with the lowest relative humidity are July and August (74%).
Average rainfall in January
Harmondsworth, United Kingdom
- Average rainfall in January: 9mm
The wettest month (with the highest rainfall) is June (21mm).
The driest months (with the least rainfall) are January, March, April and May (9mm).
Average rainfall days in January
Harmondsworth, United Kingdom
- Average rainfall days in January: 6.8 days
The month with the highest number of rainy days is June (12.3 days).
The month with the least rainy days is January (6.8 days).
Average snowfall in January
Harmondsworth, United Kingdom
- Average snowfall in January: 6mm
The months with the highest snowfall are January and February (6mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days in January
Harmondsworth, United Kingdom
- Average snowfall days in January: 1.5 days
The month with the highest number of snowfall days is February (2 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in January /
Average sunshine in January
Harmondsworth, United Kingdom
- Average daylight in January: 8h and 3min
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
The month with the most sunshine is July (Average sunshine: 7h and 54min).
The month with the least sunshine is February (Average sunshine: 3h and 42min).
Average sunshine days in January
Harmondsworth, United Kingdom
- Average sunshine days in January: 20.1 days
The month with the most sunshine days is October (20.2 days).
The months with the least sunshine days are June and July (14.2 days).
Average UV index in January
Harmondsworth, United Kingdom
- Average UV index in January: 2
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 in January
Harmondsworth, United Kingdom
- Average cloud cover in January: 57
The month with the most cloud cover is February (Cloud cover 61).
The month with the least cloud cover is April (Cloud cover 49).
Average visibility in January
Harmondsworth, United Kingdom
- Average visibility in January: 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).
