Which countries in Europe are suitable for traveling in mid-June?

I think I can travel to Holland in the middle of June. The scenery and air there are very good. The key is that the temperature is not high. If I go to Holland, I must take a thin shirt. Secondly, I can eat a lot of clean fruits in Holland. The local fruits are especially fresh and cheap. Dutch milk is also famous. If I go to Holland, I can also try their milk tea, which is said to be made of fresh milk. So I think going to Holland is a good choice.