### Phew! What a Scorcher! - part three

A commenter takes me to task "*Average temperatures can be misleading. Peaks are more interesting.
It is no consolation that average temperatures go down if one day the peak temperature reaches 100DegC, killing everyone above ground.*

Good point so off I go to Hottest days record and turn the figures into a spreadsheet:

Download it here.

So since 1900 the hottest day graph, with added trend line in black, looks like this:

Enjoy with a long cool Pimms on the terrace.

## Comments

Some numbers to complement your graph:

I imported the data from the hottest days website into Mathematica and repeated your linear least squares fit. The best fit had a NEGATIVE slope of 0.002 °C per year and a y-intercept of 32.4 °C. Mean of the data is 32.3 &dec;C with a standard deviation of 2.23. Simply generating Gaussian-distributed random numbers with this mean and standard deviation yields a plot that is essentially indistinguishable from the real data.

Posted by: David Gillies | August 6, 2006 4:19 PM