In reply to jessica_0601:
Probably due to your feet swelling in the heat and should be better in the winter.
This is a problem common to most climbers brought about by the percevied need to have tight fitting shoes (I for example have shoes 1 size too small) this is great for technical routes but not really necessary for the majority of climbing that I do so I have a few different paris including some nice comfy "all day" shoes
In general tho there is not much you can do to avoid manky feet syndrome as a climber other than wash your feet regularly (maybe a foot bath?) and make sure you get shoes that fit your feet best rather getting the latest super shoe just because it's new and all the top climbers are using them.
some manufacturers are better for wider feet some not so shop around when you come to change your shoes