En cuanto a las bodas, aquí se dice que "novia mojada, novia afortunada".
My grandma always said that, if a man married in spring, he wanted a wife, but if he married in winter, he wanted a servant.
Days between Christmas and Epiphany show what the weather will be like in the following months. (So the first day foretells January, the second foretells February etc.)
I've just read that in other parts of Spain the myth goes like that, and I'm astonished, because in Extremadura, it's just the opposite! August the first is "el juicio del año" (the year's judgment) and the twelve following days are "las canículas": their weather tells you what time next year's months will have (August the second for January, August the third for February, and so on).
And I remember fondly a story my grandpa told me when I was little:
"On the first day of the year, the clouds and Saint Peter met in Sierra Morena to decide which cloud would give rain to which part of Spain, and so Saint Peter started to tell the clouds:
"You will go to Galicia, and you, to Castilla La Vieja, and you, to Canarias..."
And soon, all the clouds parted, after arranging to meet when the year was almost over at the same place, to see how everyone had been doing.
When they met again, Saint Peter asked the clouds where each one had been, and if everything had gone well. After the clouds finished telling him, he asked:
"But... did no one of you go to Extremadura?"
After a bit of thought and asking, it was clear that no clouds had been to Extremadura that year, and so Saint Peter decided:
"Okay, now, off to Extremadura you all go!" ("Pues ahora, ¡todas a Extremadura!")
And that's why that, when in the rest of Spain it's raining, it doesn't fall a single drop in Extremadura, but when in the rest of Spain is sunny and nice, here we have huge and long, long storms."
I always loved that tale