Anyone with tips? This is a big problem in the winter for some of us! I've tried extra lights on (although haven't bought special lights, just more of them), more exercise, less exercise, various special diets on cloudy, rainy days, and not much does anything. The minute the sun comes out for an hour or so, presto, I feel better, even if I have not stepped out of my house (so it is NOT exposure to the sun on skin a-la vitamin D that is doing this in me).

I did recently read that the herb called calendula is supposed to help reduce problems with mood specifically from bad weather, but have not yet tried it. I do not have the reference anymore - but remember that it said to buy a supplement with the flowers or leaves of calendula.

Cloudy weather can really be the pits. Other issue with some people is the change in air pressure when it is raining.

Here is another idea that sometimes works:

If I fast, or juice fast, for just part of one day: from wakening in the morning until the afternoon is mostly over, then I do not get the moodiness and irritation from cloudy/rainy weather that day. I can then eat normally for dinner, and be fine.
As a matter of fact, I can eat light raw vegetables too during the day before the later afternoon, and not ruin this effect.

Perhaps the liver needs to be left alone from digesting anything all day when it is dealing with body stress, and it can do a better job of balancing your physiology during the stress of icky weather. fasting, juice fasting, and eating only raw veggies until the day is mostly over would certainly give the liver a break from digestion to work on body balancing.

You can predict it by watching the weather reports for changes in the barometric pressure, the faster the barometric pressure changes the more stress on the body to adjust to fast. Humidity adds to the pressure stress. A slow gradual change in pressure is easier for the body to adjust, some bodies are more sensitive and slower to regulate.
The barometric pressure changes disrupts the atmospheric flow of ions.
I suggest using a dehumidifier to lessen the impact when the air is humid.
Many people find they feel much better if they use a fan driven air ionizer in the room. Keep the ionizer 6 feet or more away from your body, and 6 feet away from TV or computer.