"It is rainy today."
So for everyone who is confused (since Duolingo doesn't really explain): 雨 means rain and ふります means to fall. In Japanese there is no specific word for "snowing" or "raining". 雨がふります literally means "rain falls". So 雨がふりました means rain fell today, or it rained today. 今日は雨です means it was rainy today. Just like in English you could say "It was rainy today" Or you can specify "Today it rained". Hope that helps.