To obtain the local weather correction factor, ask your energy service provider or a meteorological office. If you do not enter anything the calculation instrument will not apply any weather correction. The correction factor normally lies between 0.85 and 1.15. A figure of 0.85 signifying a particularly cold year and a figure of 1.15 a warm year. Please use a dot instead of a comma for the decimal place!
The local climate correction factor comes from the comparison between the average of the winter temperature for the reference year and the average for the winter period over a long period (for example 30 years in France, 20 years in Germany). It’s also possible to calculate this factor from the degree heating days (DD): average DD for your city / reference year DD.
NB. This calculation is for your local area. Do not compare the degree days for your reference year with the average for your country or another region. It must be compared with the average for your city.

Example A: Myatt Primary School
A meteorological office provided you the weather correction factor for the year 2004. It amounts to 1,1 which means that the winter in 2004 was unusually warm compared to an average year. Enter 1.1 on the website as your data must not contain a comma!