But if the weather is horrible, the clouds are looming, and the wind is a raging tempest, and someone says, "Great weather we're having," he probably doesn't actually mean that. He probably means that the weather is horrible, but he has said the opposite.
Pero si el clima es horrible, se avecinan nubes, el viento es una tempestad furiosa y alguien dice: "¡Qué lindo día tenemos!", es probable que no esté queriendo decir eso. probablemente quiera decir que el clima es horrible, pero ha dicho lo contrario.