They show there's been very little change in temperature for the last decade until 2008 when things dropped right off the chart into the coming Ice Age category.
We have some archived boards about how bad the ground based stations have become. Even Hansen had to give them up so he dropped both South America and Africa from the world global climate models.
During the winter, when several sites recorded all time lows, the records were invalidated because the stations were improperly calibrated. They cook the books to get the result they want, but when the result is not what they wanted, suddenly they discover that there are problems with the equipment. Given what we know about these data stations, it is possible that the actual temps were even lower than what was recorded.