Weather

Cricket is a sport played predominantly in the dryer periods of the year. But, even so, the weather plays a major factor in all cricket matches.
A scheduled game of cricket cannot be played in wet weather. Dampness affects the bounce of the ball on the wicket and is a risk to all players involved in the game. Many grounds have facilities to cover the cricket pitch (or the wicket). Covers can be in the form of sheets being laid over the wicket to elevated covers on wheels (using the same concept as an umbrella) to even hover covers which form an airtight seal around the wicket. However, most grounds do not have the facilities to cover the outfield. This means that in the event of heavy bouts of bad weather, games may be cancelled, abandoned or suspended due to an unsafe outfield.
Another factor in cricket is the amount of light available. At grounds without floodlights (or in game formats which disallow the use of floodlights), umpires can stop play in the event of bad light as it becomes too difficult for the batsmen to be able to see the ball coming at them (and in extreme cases, members of the fielding team).
On the other hand, in instances of good light, batsmen can utilize sight-screens which enable batsmen to have a white background against which they can pick out the red ball with greater ease.
The umpires always have the final decision on weather related issues.