You have probably heard the expression, "Red sky at night, shepherd's delight; red sky in the morning, shepherd's warning." This suggests that if there is a red sunset then the following day will bring fine weather, whereas if the dawn is accompanied by a red sky then the day will not be very pleasant.

Then there is the saying, "The north wind doth blow and we shall have snow." This is not always true, of course, but it does indicate quite correctly that bad weather often accompanies a wind from the north.

If you see a halo around the moon on a clear night this is said to be an infallible sign that there is wet weather to come. Of course, in Britain and Europe, this is very likely to be true because the weather is so variable anyway. In fact, the halo around the moon occurs when there is a certain type of cloud present that often precedes rain.