According to wikipedia, Roy Spencer is
a climatologist, Principal Research Scientist at the University of Alabama in Huntsville, and the U.S. Science Team leader for the Advanced Microwave Scanning Radiometer on NASA’s Aqua satellite.
So, yes the temperature anomaly in April is +0.1oC while in March it was +0.18oC and hence is indeed lower in April than in March. So what! Does he really think this means anything? Just look at the graph. The month-to-month variation is regularly of this order. He can’t seriously be suggesting that a reasonably large drop from one month to the next implies something significant about global warming or climate change. Admittedly, he doesn’t actually say any such thing, but simply posting this on WUWT must suggest that he thinks it has some significance.
Roy Spencer may well be a well-qualified scientist with years of experience, but that doesn’t necessarily mean that he’s a particularly good at what he does. If he was, he should – in my opinion – be embarrassed that he appears to have suggested that there is some significance to the April anomaly being quite a bit lower than the March anomaly. All I can conclude is that despite his qualifications and experience, he is indeed not a particularly good scientist. Alternatively, he simply likes posting things on WUWT that he knows will be appreciated by those who regularly comment, even if it doesn’t actually have any particular significance. Neither option seems to reflect particularly well on him though.