Just taking a quick look at the pattern matching for the August CET.
If we look at years with a June - July CET combination of between 16C and 17C (2014 should come in around 16.5C) there are a lot of matches. So if I then take those years where the May CET was also at least 11.6C there are 9 matches since 1900.
Of these 9 all bar one had an August CET at or above the 1971-2000 mean. The breakdown is as follows:
1982 15.7C
2005 16.2C
1989 16.6C
1959 17.2C
1933 17.6C
1911 18.2C
2003 18.3C
1947 18.6C
1995 19.2C
There are 6 years where the August CET was more than 0.5C above the 1971-2000 mean and some of them were very warm indeed. So very crudely that would suggest we have about a 2 in 3 chance (67%) of August 2014 continuing the trend of warm months more than 0.5C above the 1971-2000 mean.
What a year this is turning out to be so far. Will it keep going right through to the end of the year?