There is a sentence from a test:
It's foggy in Sydney and it's … in Moscow.
Students are to choose between "snowy" and "snowing". The correct answer is "snowing".
Why can't "snowy" be used here? I think both answers can be right, it depends on the context.
(It's rainy today)
Snowy: (of weather or a period of time) characterized by snowfall:
a snowy January day
(Source)
Best Answer
It's possible that snowy would work, but snowing is more similar to foggy. Both foggy and snowing are weather conditions. Roughly speaking both foggy and snowing mean the sky is filled with fog or snow respectively. Snowy, however, is not a weather condition. Snowy is a more general term than snowing, meaning things are covered with snow. It can be snowy and snowing or it can be snowy but not snowing.