Moderate weather; suitable for outdoor activities(noun)
WordNet. Princeton University. 2010.
Use "fair weather" in a sentence
"THE DANCING KNAVE was crowded in fair weather and foul."
"Attended and preceded by their cruiser squadrons and flotillas, this fleet of our newest and fastest ships, all armed with the heaviest guns then afloat, could in fair weather cover and watch effectively a front of nearly a hundred miles."
"Look at young Cross-Eyes, posing as a doctor, selling charms against sickness, giving good hunting, exchanging promises of fair weather for good meat and skins, sending the death stick, performing a thousand abominations."