Why is it so hard for a living tree to ignite, and how may conditions in the atmosphere influence
this?

Living trees have water circulating throughout the wood, however it is made easier by the atmosphere, since the tree has a lot more oxygen surrounding it. The tree would, even temperatures aside, be harder to ignite during winter due to more carbon dioxide surrounding the tree.

Explanation:

It is hard because the tree is wet well it still has water inside so it needs to be dry to light it on fire

Explanation:

learning from do bonfires in my backyard

ok yes, but what is the question? as soon as you ask the actual question i will answer it. : )