why it is difficult to camp out in the rainy season

In Chapter two the men discuss the perils of camping out in the rain:

"Camping out in rainy weather is not pleasant." 

We then learn about the damage rain causes;

"You are wet through, and there is a good two inches of water in the boat, and all the things are damp."

"It (the tent) is soaked and heavy, and it flops about, and tumbles down

on you, and clings round your head and makes you mad."

"It is hopeless attempting to make a wood fire, so you light the methylated spirit stove, and crowd round that."