Some people think that the weather affects the way people feel, whereas others do not agree. They believe that the weather does not have any impact on people's mood and actions.

I think that the weather indeed influences the way people feel and behave. First of all, people are part of the environment and have a direct connection with it. For example, rain and mood. Most people feel sad when it rains. Second, clear sunny weather raises one's mood and as a result their behaviour becomes more upbeat, kind, tolerant and gentle. In addition, I guess that the body produces positive hormonal reactions in sunny weather better. For example, vitamin D that is absolutely necessary for people's life can be only produced by using sun light. 

At the same time there are people who say thatweather does not affect one's mood and behaviour at all. They believe if a person is positive he or she will always feel good no matter how bad the weather or any external conditions are. They meditate and are always in a good state of mind.

I cannot agree with the opinion mentioned above for a particular reason. There are people whose mood is not influenced by weather. Nevertheless, the number of such people is very small. They are more the exception than the rule. 

In conclusion, I would like to say that weather greatly influences our mood and behaviour. The warmer and more sunny the weather is the better people feel and kinder they behave. However, one must aspire to find some ways to control their psychological conditions and not be dependent on weather too much. It might be yoga, philosophy, psychological training, or anything that works well for a person.