Degree Day

Degree Day

A degree day is a measure of average temperature over a day, and is usually related to a temperature threshold. For instance, an actual average temperature of 5°C on a day is 2 degree days warmer than an expected average temperature of 3°C. Can also be used to measure cumulative cold weather over a period. Thus if the Seasonal Normal temperature for a month is 18°C and the average actual temperature through the month is expected to be 8°C, the month will be 10 x 30 = 300 degree days colder than normal.

Did you know that your Internet Explorer Browser is out of date?

Your MS Internet Explorer browser is out of date, and will not be fully compatible with our website. For best browsing experience we recommend that you upgrade your IE browser to a more recent version or use an alternative, more recent browser.