I wonder... Using Min and Max Temps as a better measure of Global Warming

While looking at today's max and min temperatures for the city in which I live, I wondered about the possibility of using max/min temperatures, particularly in the years they occurred, as a better indicator of long-term global warming/cooling. Specifically, for any given location and day of the year, you'd collect the maximum and minimum temperatures on record. For example, on today's date, the record maximum was 81 deg F in 2007, while the record minimum was 17 deg F in 1908. If you could collect the record minimum and maximum temps for all 365 days of the year, and for all cities with temperature records dating back at least 100 years, say, back to 1900, you'd have a better, and far more granular idea of how temperature has been changing, not only overall, but in various regions, as well. The other thought I had is that while means may tend to be increasing or decreasing, max and min temps also measure weather extremes. If the min temps were remaining fairly constant while the max temps were showing an increasing trend, it could be that the weather is getting more extreme, and not necessarily warmer overall. The increase in either frequency or intensity of the max temps could be dragging the mean up. Similarly, a decrease in the severity of winters could be dragging the means up, as well, even if the summers are remaining constant. Just a thought. What do you thinK? Archived source: https://web.archive.org/web/20140329092905/http://www.spacetimeandtheuniverse.com/off-topic/6176-i-wonder-using-min-max-temps-better-measure-global-warming.html