Summarize point (5).

Point (5) states: 'But it is impossible to say in advance how these weekends will go (productively or lazily) or whether the summer will be hot and the winter snowy.'

Explanation: This point highlights the uncertainty of certain events. While we know the weekend will come, we can't predict exactly what we'll do. Similarly, we know seasons change, but we can't be sure about the specific weather conditions.