According to Dr. Roy Spencer‘s and Dr. John Christy’s measurements, the global lower tropospheric temperature anomaly for August 2018 was 0.19°C above the 1981-2010 long-term average. This is down 0.13°C from July 2018, which was 0.32°C.
Meanwhile, the global land and sea surface temperatures for August were lower than the global lower troposphere, at 0.159°C above average, down 0.066°C from July, which was 0.225°C.
Because the UAH dataset only includes the global lower troposphere, and NECP only includes the land and ocean surface, both are NOT totally 100% accurate global temperature measurements in my opinion. In order to find the actual anomaly, we need to average both datasets together. When we do this, we get 0.1745°C for August 2018, which is the coolest month since July of 2015, which was at 0.1525°C.
If the PDO does soon flip into its negative phase, if we get a large uptick in volcanic activity, then I think we are going to be in for a long cold spell for the next century and a half. Welcome to the Grand Solar Minimum folks.