a. 1. Made or done in pleasant weather, or in circumstances involving but little exposure or sacrifice; as, a fair-weather voyage. Pope. [ 1913 Webster ]
2. Appearing only when times or circumstances are prosperous; as, a fair-weather friend. [ 1913 Webster ]
Fair-weather sailor, a make-believe or inexperienced sailor; -- the nautical equivalent of carpet knight. [ 1913 Webster ]