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"
June 24, 2020 - My answer (marked wrong): Today there is heavy frost
Is there a reason for this? I marked my answer as 'should be correct'. In English we can certainly put "today" at the beginning or ending of this sort of sentence, so I'm not sure why this is considered incorrect. Can a native speaker let me know why this would have been wrong? If it's fine, can a contributor/mod please include it as a possible answer? Thanks!