Gardening Articles: Care :: Plant Care Techniques

A Gardener's Guide to Frost (page 3 of 3)

by Eliot Tozer

Do Consider Dew

The dew point is the temperature at which the air is totally saturated with moisture. Television and radio meteorologists may state the dew point temperature during routine forecasts.

The more moisture the air contains, the higher the temperature will be when the moisture starts to condense as dew, producing heat. And, obviously, the higher the temperature, the less chance of frost. For example, a dew point of 43°F almost certainly means no frost that night.

Interestingly enough, frost is more likely to form on a dry evening when the air temperature is a warmish 50°F and the dew point is a low 33°F than when the air temperature is a cooler 43°F and the dew point is 41°F.

Eliot Tozer writes and gardens in Tappan, New York.

Photography by David Cavagnaro

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