sierra, you need to appreciate that there are no direct...

sierra, you need to appreciate that there are no direct temperature measurements prior to "modern man". All such readings are done via proxies, such as ice cores. A more general view of historical temperatures can be found via other means. For example the river Thames froze over a number of times some 150 years ago or more. Yes, these are localised events but they give a good indication of at least the regional climate.

As for historical temperatures obtained from ice cores, here a link. There are many others.

http://www.ianschumacher.com/iceages.html