Consider the following premises. Charles is climbing a mountain if and only if it is sunny. For all x_5, x_5 will not climb a mountain. Can we infer the following from them? It is sunny.
 From the fact that for all x_5, x_5 will not climb a mountain we can infer that Charles is not climbing a mountain. Finally, from the fact that Charles is climbing a mountain if and only if it is sunny, and that Charles is not climbing a mountain we can infer that it is not sunny, which contradicts that It is sunny. Therefore, the answer is no.