4 acres of hard frost for Michigan including Ann Arbor and Detroit ‘burbs’
Cold air will settle in Michigan and almost to the southeastern corner. Several mornings start with freezing temperatures, which means that most areas have what I would call a hard frost.
A hard freeze usually occurs when temperatures drop into the upper 20s for four hours. This is generally the case when we find that all plant growth has been killed and it is the end of the growing season. This also means that the lawn mowing season is over.
Here are the minimum temperatures forecast for this week.