Degree Days is a service created to allow users to quickly calculate Heating and Cooling Degree Days for any postal region in the UK.

Degree Days concept

Degree days are not a new idea as the original concept was put forward about 100 years ago for use in horticulture. Nowadays, however, by far the largest use of degree days is for building heating purposes, for which they have been used in Britain for about 50 years. Degree days have become especially important since it has been shown how valuable they are in monitoring the benefits of energy saving measures in buildings, particularly now that the very large amounts of energy that could be saved in buildings have been recognised.

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Degree Days

How does it work? provides users with an intuitive interface that requires a postcode, base temperature and date range. We use this information to accurately calculate heating or cooling degree days for the full date range down to the hour using our own internal UK weather database and use weather data from the closest weather station to the supplied postcode.
When the temperature maintained inside is higher than the temperature outside, any building will spontaneously lose heat.

The Degree Days calculator shows the heating base temperature, the cooling base temperature and the opportunity to add in a specific time frame or postcode.

Degree Days graph