Do three swallows make a summer?

Never managed to capture a recognizable swallow on the wing. Can just about tell these are swallows!

What a beautiful day, much too nice to be inside, can't believe this is winter, it's better than some of the summers we've had(though not last year - great summer, easy winter, especially for me since I missed the worst 3 weeks so far).

Will it last, or will that Southerly come charging in and flatten all the precocious spring flowers?