break the ice
to make people who have not met before feel more relaxed with each other
A breeze
something that is easy to achieve, often unexpectedly
come rain or shine
whatever happens
fair-weather friend
someone who is a good friend when it is easy to be one and who stops being one when you are having problems
have your head in the clouds
to not know the facts of a situation
rain cats and dogs
to rain very heavily
save/keep money for a rainy day
to save money for a time when it might be needed unexpectedly
snowed under
having too much to do
under the weather
If someone is or feels under the weather, they feel ill
weather the storm
If someone or something weathers the storm, they successfully deal with a very difficult problem
full of hot air
Full of lies, exaggerations, or nonsense.
on cloud nine
to be extremely happy and excited
second nature
If something is second nature to you, you are so familiar with it that you can do it easily without needing to think very much about it
a wet blanket
a person who says or does something that stops other people enjoying themselves
be snowed in(up)
to be unable to travel away from a place because of very heavy snow