If a cricket pitch is exposed to heat and sunlight the moisture in the pitch evaporates and the surface becomes harder. This makes ball bounce more but reduces the swing on the ball. As a result ball carry improves and batting becomes easier.
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It seems that a cool, still, humid, day with heavy cloud cover makes the ball swing more but the reason for this has yet to be worked out. On a hot, windy, sunny day the ball swings very little. So the ball swings more at Lords in London than at the WACA in Perth but this could also be because they use a different ball in England than they do in Australia.
When the cricket pitch is wet, balls may not bounce off easily. The players may also have a hard time maintaining a firm grip on the ground.