Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
The average high-temperature during December registers at a frosty 7.6°C (45.7°F), closely corresponding to the preceding month. Harrow nights in December witness a mild cool down to an average temperature of 3.3°C (37.9°F).Humidity
December is the most humid month, with an average relative humidity of 89%.Rainfall
In Harrow, during December, the rain falls for 12.2 days and regularly aggregates up to 33mm (1.3") of precipitation. In Harrow, during the entire year, the rain falls for 165.8 days and collects up to 345mm (13.58") of precipitation.Snowfall
January through March, November and December are months with snowfall in Harrow. In December, in Harrow, it is snowing for 0.6 days. Throughout December, 8mm (0.31") of snow is accumulated. In Harrow, during the entire year, snow falls for 5.5 days and aggregates up to 40mm (1.57") of snow.Daylight
The month with the shortest days in Harrow is December, with an average of 7h and 54min of daylight.On the first day of December, sunrise is at 7:45 am and sunset at 3:55 pm. On the last day of the month, sunrise is at 8:07 am and sunset at 4:01 pm GMT.
Sunshine
In Harrow, United Kingdom, the average sunshine in December is 4.4h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Harrow. A UV Index estimate of 2, and below, represents a minimal health hazard from exposure to the Sun's UV radiation for the average person.Note: The maximum daily UV index of 2 in December converts into the following recommendations:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
Frequently asked questions
What are the temperatures in Harrow in December?
What is the most humid month in Harrow?
What is the average humidity in December in Harrow?
How many days does it rain in December in Harrow?
How many days does it snow in December in Harrow?
What is the month with the shortest days in Harrow?
How many hours of daylight does Harrow have in December?
When is the sunrise / sunset in December in Harrow?
How many hours of sunshine does Harrow have in December?
What is the month with the lowest UV index in Harrow?
How high is the UV index in December in Harrow?
Average temperature in December
Harrow, United Kingdom
- Average high temperature in December: 7.6°C
The warmest month (with the highest average high temperature) is July (21.8°C).
The month with the lowest average high temperature is January (6.7°C).
- Average low temperature in December: 3.3°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 December
Harrow, United Kingdom
- Average pressure in December: 1014.4mbar
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 December
Harrow, United Kingdom
- Average wind speed in December: 17.3km/h
The windiest month (with the highest average wind speed) is February (17.6km/h).
The calmest month (with the lowest average wind speed) is July (12.7km/h).
Average humidity in December
Harrow, United Kingdom
- Average humidity in December: 89%
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 December
Harrow, United Kingdom
- Average rainfall in December: 33mm
The wettest month (with the highest rainfall) is June (46mm).
The driest month (with the least rainfall) is January (19mm).
Average rainfall days in December
Harrow, United Kingdom
- Average rainfall days in December: 12.2 days
The month with the highest number of rainy days is July (18.4 days).
The month with the least rainy days is February (10.8 days).
Average snowfall in December
Harrow, United Kingdom
- Average snowfall in December: 8mm
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 in December
Harrow, United Kingdom
- Average snowfall days in December: 0.6 days
The month with the highest number of snowfall days is February (2.1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Harrow, United Kingdom
- 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 December: 4h and 2min
The months with the most sunshine are July and August (Average sunshine: 8h and 0min).
The month with the least sunshine is February (Average sunshine: 3h and 42min).
Average sunshine days in December
Harrow, United Kingdom
- Average sunshine days in December: 16.3 days
The month with the most sunshine days is December (16.3 days).
The month with the least sunshine days is July (9.3 days).
Average UV index in December
Harrow, United Kingdom
- Average UV index in December: 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 December
Harrow, United Kingdom
- Average cloud cover in December: 58
The month with the most cloud cover is February (Cloud cover 61).
The months with the least cloud cover are April and September (Cloud cover 49).
Average visibility in December
Harrow, United Kingdom
- Average visibility in December: 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).
Harrow, United Kingdom
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