1. We can't decide whether to go to The Bahamas
for Christmas or Hawaii.
2. What's the weather like in Galicia this time of
year?
3. There's no such thing as bad weather, just the
wrong clothes.
4. By this time tomorrow we should know whether
or not she got the job.

Weather - tiempo (climatic conditions)
Whether - si, tanto si, aunque (if, regardless of
alternatives)