Hawthorne uses a simile comparing Pearl's beauty to a hot summer day. This illustrates her as the bright and playful character she can be. The next quote is a simile because Hawthorne compares Chillingworth's eyes to the reflection of a furnace and a fearful fire. This can show how horrible a person Chillingworth has become. It's a fair comparison. The final quote uses a simile to describe how Chillingworth investigates Dimmesdale. Hawthorne ultimately describes this as akin to the coldness of an undertaker. These uses of similes are perfect because they make them feel exactly how the author wants them to