To tell the weather, go to your back door and look for the dog.
If the dog is at the door and he's wet, it's probably raining.
But if the dog is really soaking wet, it's probably raining very hard.
If the dog's fur looks like it's been rubbed the wrong way, it's probably windy.
If the dog has snow on his back, it's probably snowing.
Of course, to be able to tell the weather like this, you must leave the dog outside at all times, especially if you expect bad weather.