I seem to recall it snowing in either late May or early June in the drought year 1976. We were on the way to the Midlands to pick up a hire boat on the canals. There was a small flurry around Banbury.
It then went on to be scorcher.
You are right on both counts. At the time I was living in the family home just south of Banbury and my sister got married in mid July and we were a little concerned by the snow
We had a marquee in the garden for the wedding and the grass everywhere was brown due to the lack of rain it did rain one day leaving a green rectangle outline where the rain had fallen down the sides of the marquee
That was certainly a hot summer!