Damp should just accelerate the curing, so you may not get quite a good bond, but should still stick. England is usually damp and we get by ok.

Probably the CA gone off.

Suggest you gently rub down the bits to be re glued, CA doesnt seem to bond too well with wood that has allready been exposed to CA.

The Chipmunk is a great plane. Suggest you watch the weight though during building, mine came out at 8 1/2 lb. Still flys great, but would be even better if lighter.