For some people, a rainy day means coffee, a blanket, and quiet. For others, the same weather means low energy and no motivation. Neither reaction is wrong, both are genuine.
The difference largely comes down to light sensitivity. For a nervous system that's sensitive to daylight, an overcast gray day can genuinely lower energy. For others, that same gray light is just an invitation to slow down.
Knowing your own reaction helps, because you can plan the day around it. For the ones whose energy dips, a bit more light and a livelier sound. For the ones seeking calm, that same soft gray atmosphere is exactly what they need.