Why is there no frost on cloudy nights?

Frost forms when the temperature of the ground drops to the dew point, allowing moisture in the air to freeze. On cloudy nights, clouds act as an insulating layer, trapping heat radiating from the Earth's surface and preventing temperatures from dropping low enough for frost to form. Additionally, clouds can hold moisture, which can also raise humidity levels, further reducing the likelihood of frost. Therefore, cloudy conditions generally inhibit the formation of frost compared to clear nights.