Dear friend,

You can concentrate these two meterological parameters with respect to the accidents if possible collect in this aspect. If you can tell what way you want your thesis to be, then accordingly I can help you. This subject is being my one of the favourites. You can get many valid information pertaining to the climatic effect on accidents.
If anything more you require, you can send further queries.
Yours faithfully,
O.M. Murali