Um, maybe to use it in an commercial setting? I've literally no idea what you're talking about as I've never come across that before. I've always just pulled down the station stuff I need by hand (since you can get all the station's data at once), or by some lightly mechanized webscraping. Your comment sounded significantly more chill than what it seems like you might need.
It wouldn't be terribly difficult to mechanize this and get all the data at once, but I thought you wanted to occasionally see how much it rained, not build a service out of this.
Does this page[1] not contain what you need?