Web site for Heating Degree Days

I discovered a cool website. I was looking for a source of information for Heating Degree Days (standard metric used by gas companies, etc).

Calculating Heating Degree-Days
HDDs are calculated simply by subtracting the mean daily temperature (C°) from 18° C. The daily mean temperature is arrived at by averaging the maximum and minimum temperatures for the day. Where the daily mean temperature is above 18° C no degree-days are counted. These daily values are then added together to obtain a cumulative total for the period of record (i.e., week, month, year).

Not surprisingly, it turns out that Environment Canada has a website that provides this information. It is quite interesting, actually.

Go the Environment Canada Canadian Climate Data web site, enter your search criteria (province, city, daily/monthly/etc), to get the data in a table form. You can click a little chart symbol to see the information in a chart, or click to download the data in CSV or XML format.