Anandakanda 1.19.29

1.19.29

śleṣmakṣayaścānudinaṃ tasmādvāyoścayo bhavet /
<varṣartusvarūpam>
varṣartau paścimo vāyurmahī navatṛṇāvṛtā //

There is a daily decrease of the phlegm humor, and therefore an accumulation of the vāta humor occurs.
<Characteristics of the rainy season>
In the rainy season, the wind is westerly, and the earth is covered with fresh grass;