VFR - Visual Flight Rules. Private Pilots start as VFR certified. This means that, in most cases,they must have about 3 miles of visibility, be 500 feet below clouds, 1000 feet above clouds, and/or 2000 feet next to clouds at a bare minimum. Unless they have an Instrument Rating (and all the associated control along with that...see IFR), they are required to avoid all clouds and weather.
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