What's the temperature and weather like going to Eastern Europe from the end of May to the beginning of June?

Europe has a maritime climate, which is warm and humid all year round. Under the influence of prevailing westerly winds, cyclones frequently cross the border in this climate all year round, with an annual rainfall of 500-700 mm, reaching more than 2,500 mm in areas with favorable terrain. The average temperature in Leng Yue is above 0℃, and the warmest month is below 22℃. Annual range is much smaller than inland and east coast areas of the same latitude.

The temperature is about 20 degrees in May and June, and it is rainy. So the temperature and humidity at this time are suitable for going to Eastern Europe.