There should be an article before "frost". Correct solutions would either be "There is a strong frost today" or "Today, the frost is strong" Regardless, this isn't something common in American English. A common phrase regarding frost would be "Tonight there will be a frost" or "Expect a deep freeze overnight with icy roads and walkways". A frost does not usually occur during the day. A better sentence would be "Сьогодні сильний вітер" with a translation of "There is a strong wind today"
Thank you. I see the translation was changed. This makes a lot more sense now.
I totally agree with you. I also wrote "there was a strong frost today". It should have been accepted as a correct answer.