Weather and Nature
Nature in Act 1
-Macbeth is worried about karma and thinks he will get bad karma if he kills Duncan.
-If Macbeth does kill Duncan then he believes the deed will be spread through the skies and heavens.
Nature in Act 2
-Macbeth was waiting to hear his wife ring the bell and was speaking to himself and he noticed how quiet it is during the night when half of the world is sleeping.
-It was nighttime and nothing was happening and Macbeth's nervousness was getting to him and causing him to notice the silence.