Do you become unhappy when clouds appear in the sky?

　Are you more cheerful on a sunny day than on a rainy day?

　Does the weather really affect your moods?

　Most of us feel that stormy weather makes us sad,and many

　psychologists would agree: rain or snow can bring on sadness and

　depression in some people.

　This feeling may be caused by having to stay indoors for too long

　during bad weather.

　But there are some people who are unusally sensitive to weather.

　Rather than just feeling blue on a cold,dreary day,forexample,they

　actually find it difficult to carry out their daily routine.

　Even going to work or to school becomes a big job for these

　people.

　Some people also become very depressed during the dark days of

　winter.

　They suffer from a sickness called‘seasonal affective disorder’

　or SDA.

　Doctors think this condition is due to lack of sunlight.

　In contrast,a sunny day,particularly during the winter in colder

　northern regions,can make people feel happy and optimistic.

　When the weather is pleasant,people are friendlier and more

　willing to help one another.

　For example,it has been found that customers give waiters bigger

　tips on sunny days.

　But when the weather is too hot and humid,people tend to become

　more aggressive.

　It shouldn’t surprise you to learn that most people prefer

　moderate temperatures,somewhere in the low twenties,perhaps with a

　slight breeze.

　People generally don’t like too mush wind,nor do they like it

　when the temperature changes more than fifteen degrees in a short

　period of time.

　Naturally,everyone enjoys sunny days,but after too many bright,

　cheerful days in a row, even sunshine can lose its appeal.

　People look forward to a change of weather from time to time.