Overcast, raining, gusty, vile weather - but not yet cold.
Con = With
Have faith/trust in yourself. That's what self-confidence actually means.
So why don't people just say self-trust or self-faith? The word self-confidence is one of those in the English language that is bandied about so loosely, that its meaning has become bastardized to near uselessness. Most people are taught it in the context of a celebrity or a cocky schoolmate. For example, a child might hear Wayne Rooney described as self-confident. So a child thinks that when they need to be self-confident, they need to be like Wayne Rooney. They emulate him in a superficial manner, and think that emulation gives them self-confidence.
And what happens when the Upper Year school drug dealer is the model of Self-Confidence?
Without the teachings from a Church or a surrounding strong social community, how will anybody learn the right kind of Self-Trust? Through trial and error? Through the luck of being born with all the right things ( money, good family, superlative genes, good looks, healthy, fit athletic body, intelligence)? How can an asthmatic, for example, be expected to teach themselves self-confidence, when they know that every so often their body fails them perilously?
Self-faith in the face of challenge and self-encouragement when faced by failure are fundamental essentials to survival. Those who cannot foster it in others, must be shamming their own self-confidence.