Summer into early autumn - July, August & September.
There's consistency in the latest output from the ECMWF 46-day model forecast, and for a forecast that's a good thing to see. I stress that below is a description of what the model is saying, it's not yet our official forecast although it will form a major part of it.
Spring and early summer, April, May & June:
Part 1: The rest of winter - January to March: 5911