Excuse me, what is the approximate temperature and what clothes should I wear when I go to northern Europe in mid-April?

In mid-April, the snow stopped in northern Europe. Spring has come, and it will dawn after six o'clock, and the white is getting longer and longer. There are birds singing, but there is no bloom yet. Of course, for southerners accustomed to warm sunshine, it is still winter, and it is winter. The weather is changeable, sometimes warm and sometimes cold, sometimes sunny and sometimes rainy. I don't wear a thick snowsuit anymore, but it's still cold even when the sun is shining, it's windy and rainy. Wear more thermal underwear/pants and sweaters. I also need a coat, and it's windy. Within a day, the lowest is about 0-5 degrees, and the highest is 10- 15 degrees.