The average amount of rainfall in London in mm per month is:
July-57mm August- 59mm
September- 49mm October- 57mm
This is an acurate observation. Hope this helps!
You can not work out the average rainfall saying that if 200 mm of rain fell in 4 months (as a monthly average) therefore the average in one month is 50 mm (that's not true!), it would be 200 mm every month for 4 months .... On average!
Now if the average precipitation (every month) is 50mm then the average in a full year is:
50 x 12 = 600 mm per year.
In case of London is about 50 mm a month or 600 mm a year.
London, on an average, receives almost 50 millimetres of rain a year. The month-wise break-up of average rain received (in millimetres) by the British capital is as follows: 61 millimetres in the month of January, 36mm in February, 50mm in March, 42mm in April, 45mm in May, 46mm in June, 46mm in July, 44mm in August, 43mm in September, 73mm in October, 45mm in November and 59mm in December. October is the wettest month of the year.
London receives a total of 177mm in the last three months (or the fourth quarter) of the year. That means on an average, the British capital receives about 59 millimetres of rainfall in the last three months of the year, which is nine millimetres above the annual average. On the other hand, it receives a total of 266mm in the six months between April and September (or the second and third quarters) of the year. That means on an average, the British capital receives only about 44 millimetres of rainfall in the second and third quarters of the year, which is six millimetres below the annual average.
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