Since autumn, the climate has been very dry. What does dryness mean in this sentence?

I think the climate is very dry in autumn, which means that the water vapor content in the air is very low. This is because after autumn, the rainy season has passed and it rarely rains, but the temperature is still relatively high, which causes The climate is very dry. This kind of climate makes people prone to colds and sore throats, making people feel very uncomfortable, so people should drink more water and eat more fresh fruits and vegetables, etc. Dry climate can easily cause fires and should take corresponding preventive measures.