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Harrow on the Hill experiences a temperate maritime climate with mild summers and cool winters.
In the summer months, the average temperature is between 15 and 20 degrees Celsius. July and August are the warmest months, with the highest temperature reaching an average of 25 degrees Celsius.
In the winter months, the temperature drops to an average of 5 to 8 degrees Celsius. The coldest months are December, January and February, with the temperature dropping to an average of 2 degrees Celsius.
Rainfall is fairly consistent throughout the year, with an average of around 20 to 30 millimetres per month. The wettest months are November and December, with an average of 45 millimetres of rain each month.
Snowfall is rare, but can occur in Harrow on the Hill, especially in the winter months.
Overall, the climate in Harrow on the Hill is mild and relatively consistent throughout the year.
As of 2020, the city population is 12270.
This map shows the current & 7-day weather forecast, weather alerts, and weather radar for Harrow on the Hill, Harrow.