cool weather

Why is the weather in the North still as cool as late Spring at the end of May?
In May 2024, the North had many days of thunderstorms and cool weather like the last days of Spring with the highest temperature not exceeding 32 degrees Celsius.
Weather forecast on June 7: Sunny day, afternoon and night thunderstorms
Weather news on June 7 according to TTKTTV said that the sunny day, afternoon and night are cloudy, showers and thunderstorms scattered in many areas.