Sunny weather encourages people out and about, so the run up to summer is a busy time.
This also gives you the advantage of lots of lovely sunshine in which to inspect a car all over.
Convertibles are more popular in the summer, but the difference in prices between summer and winter for open tops has dwindled, so don't pay over the odds when the sun pokes out.
Winter means dark times all round. Rainy weather can hide any number of battle scars on the bodywork, so wait till a dry day when you're shopping.
For the best nearly new bargains, wait until a registration change has taken place and go hunting towards the end of the month when a dealer has plenty of trade-ins.
They'll be keen to shift these to boost the month's sales figures, so a keen offer can secure a great buy.