Berkeley Temperature record update2 the longer recordby Jonathan DuHamel on Nov. 03, 2011, under Climate change
If one looks, however, at a longer record the perception is different. The second graph is the Central England Temperature record (CET), as far as I know, the longest continuous instrumental record in existence. It covers the period 1659 to 2009. Also plotted with the temperatures are carbon dioxide emissions (black line).
The impression from CET is that the temperature has risen steadily and modestly as the planet warmed up from the so-called Little Ice Age which reached its coldest around 1607. We see within this record shorter intervals of more rapid warming and cooling. We also see that the rapid rise of carbon dioxide emissions has had no apparent effect.
More discussion and more long temperature records from Europe can be found in this post:
And for some additional perspective, the graph below, based on proxy data, shows the relative temperature for the past 10,000 years.