THE solstices, when the length of night or day is at its longest, depending on which hemisphere you are in, represent the midpoints of summer and winter.
In the northern hemisphere the summer equinox is June 21, so the summer months would naturally surround this.
It takes the world a few weeks to heat up in response to the sun's warmth and the best weather is usually delayed to June, July and August.
Some countries assign months by the solar seasons while others use the meteorological seasons, which can cause confusion.
As weather is infinitely variable from place to place, it is arguably better to stick with the solar version. Nevertheless, we all know May can be cold and that August is still summer. Simple.