My wife and I are going to celebrate our 50th birthdays (her's this year and mine next year) with a three week trip to the British Isles. I've always wanted to see Scotland. We're in the formative stages now, getting started on the planning.

The best times for us are in the spring or fall (she directs a child care/private school and can't get away summer or winter). Which season would offer the best promise of good weather. I realize predicting weather is a risky business, but usually which season, spring or fall, has the best weather?
I'd like to purchase the flight before the prices go through the roof.

Thanks in advance,

Dale