Previous post:

Next post:

Developments in Degree Days

by mel starrs on May 21, 2008

in Building Physics

Readers may have missed this comment posted recently by Martin B, so I’ve reprinted it in full here:

Another belated follow up on your post (original post here): we just recently launched Degree Days.net, a free site for generating degree days: http://www.degreedays.net/

Since writing that article about problems with degree days, many of which are caused by poor data, it occurred to me that, instead of talking about the lack of good data, we should really do something to fix it (we are a software company after all)… So we made Degree Days.net.

It generates degree days on the fly, using temperature data from the excellent Weather Underground (we’re oh so grateful to them for giving us permission to make Degree Days.net).

The search function is a little hit and miss, but there are actually something like 1000+ UK weather stations in there that you can generate degree days for. Many of the stations have poor data (Degree Days.net says if it has to make estimates), but the airport stations are generally pretty reliable.

You can get HDD and CDD going back 36 months, in monthly, weekly, or daily formats, and to any base temperature you choose. All completely free.

I haven’t used degree days in anger for a while now, but this resource looks very useful. Here’s a screen grab from a quick example I pulled down for Leeds Bradford airport.

degree days

I’m know the guys at BizEE would welcome any feedback, if anyone wants to check out the site. Good to see someone addressing a problem, especially with an opensource ethos.

  • http://www.bizeesoftware.com/ Martin B

    Thanks Mel! Feedback would certainly be welcome if anyone should have any to offer – there’s an email address on the site that goes straight to me.

  • http://www.bizeesoftware.com/ Martin B

    Thanks Mel! Feedback would certainly be welcome if anyone should have any to offer – there’s an email address on the site that goes straight to me.