Since I know that it was eating all of you up inside, I have decided to tell you why. Silly reason, actually.
See, every year (bar this one. ffs, the one year I want to test it out, it doesn't even rain in sydney!) it rains on the 10th of Feb. (I know, because it is my mum's birthday) So, I wanted to see how far it stretched.
Also, when I was little my mum's mum told me this story:
Scholastica was dedicated to God from a young age (some tellings of her story indicate that she preceded Benedict in godliness, and he came to holiness after she did, and in her wake). The most commonly told story about her is that she would, once a year, go and visit her brother at his abbey, and they would spend the day worshiping together and discussing sacred texts and issues.
At the end of the day, they had supper and continued their conversation. When Benedict indicated it was time for him to leave, she protested, and begged him to stay with her for the evening so they could continue their discussions. He refused, insisting that he needed to return to his cell. At that point, Scholastica closed her hands in prayer, and after a moment, a wild storm started outside of the guest house in which they were housed. Benedict asked, "What have you done?", to which she replied, "I asked you and you would not listen; so I asked my God and he did listen. So now go off, if you can, leave me and return to your monastery."
Benedict was unable to return to his monastery, and they spent the night in discussion. According to St. Gregory's Dialogues, three days later, from his cell, he saw his sister's soul leaving the earth and ascending to heaven in the form of a shining white dove.
Now, not that I believe it, but it always had me confused a little (see, it was supposed to rain every year on the 10th of feb in commemoration). Being little I could never stop thinking that this was maybe the reason why it always rained

Anyway, thanks for humouring me!