Clogs are typically made of materials such as wood, leather, or canvas, which are not waterproof. They may be able to resist some moisture, but they are not designed to keep feet dry in wet conditions.
Clogs often have open backs, which allow water to splash onto the feet from behind, particularly if you're walking in puddles or wet grass.
The soles of clogs may not provide sufficient traction on wet surfaces, increasing the risk of slipping and getting your feet wet.
The fit of clogs can also affect how well they keep your feet dry. If they are too loose, water can seep in around the sides.
Even during a drought, there may still be occasional rain or dew that can make surfaces damp. In these situations, clogs are unlikely to keep your feet dry, particularly if they do not have a waterproof coating or lining.