The chart Sawzall linked to has temperature records for one geographic location.

That chart shows a slight (2+ degrees F) rise in average temperature between 1929 and 1949. Back to "normal" now.

Many sources report that the warmest period in the last 150 years was between WWI and the end of WW II, a similar observation.

To get graphs that perport to show a sharp rise in the period from 1995 to date, the phoney "scientists" at East Anglia spliced data from different location! Totally bogus.