From Clive Best:
My preferred method for calculating the global average temperature anomaly for HADCRUT4.6 is by triangulating the measurements over the surface of a sphere. This gives almost identical results to those of Cowtan & Way but is a far simpler and faster method. Here is my update for July 2018.
Here is a the detail for the Northern Hemisphere
Finally here is the Southern Hemisphere (their winter) which shows cooler than normal temperatures over the tip of South America.