Temperature inversion

A temperature inversion is a phenomenon in which cooler air accumulates near the ground, while warmer air is found higher up. It can increase the risk of frost even when the forecasted air temperature seems safe. This phenomenon is particularly important for field-grown tomatoes in the spring and fall. On a cool, windless night, it’s a good idea to measure the temperature at plant height and prepare a cover in advance, especially in low-lying areas.