Dreaming about winter can have varied meanings but in general refers to the emotional condition of you. It can show whether you are affected happiness or melancholy or whether your energy and spirit is up.
If you dream about vast winter landscape it signifies that you are in a melancholic mood and that your emotional reactivity is diminished. You might be somewhat devoid of emotions the same way the winter landscape is devoid of vivid color. You might need a rather large change in your life in order for you to be shaken up out of this melancholic mood.
If the weather conditions in your dream are suggestive of the season being winter it signifies that your immune system and the resistance to disease might be down. You should avoid doing things that in the past had a chance or worsening your health as now you might get ill more easily due to the lack of strength in your immune system. Alternative meaning of this dream is that you are not happy with your work or the results from it. You might look for ways in which you would be able to turn a new page professionally.
Seeing a very tranquil, almost idyllic winter landscape suggests that you have inner peace and that you are quite happy with your social situation. You might also not have any major worries about your future.
If you dream of any sort of winter activity such as skiing or snowboarding it indicates that you luck will be on your side in your professional life and career. It might be said that will make bold and quite risky decisions but despite this luck will be on your side and you will emerge successful. Generally, having this dream also indicates that you will soon prove yourself in your professional life in front of prying eyes.