uk mean temperature avergae
1 The annual average temperature in London, England, Uk is quite mild at 10.4 degrees Celsius (50.8 degrees Fahrenheit). 2  The variation of mean monthly temperatures is 13.5 C (24.3 F) which is a low range.3  There is a range/ variation of diurnal average temperatures of 6.8 C (12.3 F).ondon, England Average Temperatures Chart. The average temperature charts use a fixed scale so that you can easily compare temperatures between two or more locations. Simply line up the charts in separate tabs in your browser and toggle between tabs to visualise the differences.