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rain day

In British climatology, a period of 24 hours, normally commencing at 0900 UTC, in which at least 0. 01 in. Or 0. 2 mm of precipitation is recorded. It is the practice of the U. S. National Weather Service to use phrases that are more self-defining, such as “day with measurable precipitation” or “day with 0. 01 inch or more” (of precipitation).

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