Meteorological observations

There are significant changes in the weather during eclipses. As the amount of sunlight is reduced, the temperature of the surrounding air begins to fall. This results in corresponding changes in the barometric pressure, wind speed and direction, dew point and humidity.


These changes can sometimes result in unexpected fog or dew formation that can hinder eclipse observations and photography; they should be anticipated and equipment should especially be monitored for dew formation if the relative humidity is high.