Consider the following premises. It is sunny if and only if it is raining. It is raining. Can we infer the following from them? It is not sunny.
 From the fact that it is sunny if and only if it is raining we can infer that if it rains, then it is sunny. Finally, from the fact that if it rains, then it is sunny, and that it is raining we can infer that it is sunny, which contradicts that It is not sunny. Therefore, the answer is no.