The climate has been very dry since autumn. What does drying mean in this sentence?

I think the climate in autumn is very dry, which means that the water vapor content in the air is very low. This is because after autumn, the rainy season has passed and there is little rain, but the temperature is still relatively high, making the climate very dry. This kind of climate easily causes colds and sore throats, which makes people feel uncomfortable. Therefore, people should drink more water and eat more fresh fruits and vegetables. Dry climate is easy to cause fires, so we should take relative preventive measures.