As fall gets started here in north central florida, we regularly have fog and dew formation as radiative cooling drops the air and surface temperatures below the dew point. This is illustrated in the ConCam RH images of several nights late in October, 2003. Here we can see three frames from the series of images taken the night of October 22/23, 2003. The temperatures and RH (relative humidity) plots were generated by tools available from the FAWN (Florida Automated Weather Network) homepage at http://fawn.ifas.ufl.edu/ .
The data of particular interest are "Dew Point", "Temp at 6 Ft", and "RH". Note that as the temperature came within about 2 °F of the dew point, dew began to appear on the ConCam lens. The relative humidity (actually calculated from dry bulb/wet bulb temperatures at 2 Ft.) reached its maximum at about the same time. Although the rest of the night was essetially clear, the ConCam RH images were obscured by dew for the entire remaining dark period. The Images and the animation of the might are located at http://concam.net/rh/rh031023.html .