First Ground Frost of Autumn – October 18th 2018

The first ground frost of Autumn was evident this morning. Frost could be seen on cars and on the grass when I went out about 8am. The air temperature was still well above freezing though, bottoming out around 3.5 degC. This shows how the temperature at ground level can be much lower on clear nights, when the dew point is depressed in slightly drier air. The day then turned out to be superbly sunny and quite mild. A classic Autumn day!