I did a test. For my city, I took yesterday's high of 11.3 and low of 5.4 Celcius and got an average of 8.35.

Then I went to the http://www.climate.weatheroffice.ec.gc.c...th=9&Day=24 page, I added up all the temperatures and divided by 24 to get 7.6 Celcius. It amazes me how two different methods can give such different averages. Granted, the weather is changing quite quickly, so I took July 3 (because it seemed like a typical day) and redid the calculation:

(15.8+27.8)/2=21.8
510.6/24=21.275

Lower again. Hmmm. Must be global cooling. :p

John M Reynolds