If air temperature and dewpoint correspond, the air is satisfied with vapor and there is a humidity of 100 %. Fog formation is the consequence.
In addition the evaporation - mentioned also evapotranspiration - is performed. It is calculated from temperature, air humidity and wind speed. With the leaf moisture rain starting or fog is recognized well.
| Temperature | Dewpoint | Humidity | Evaporation | Leaf wetness | |
|---|---|---|---|---|---|
| Graph | ![]() |
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| Value | 17.2°C | 15.2°C | 88 % | 1.50 mm | --- |
| Minimum | 14.3°C at 7:14 o'clock |
13.3°C at 3:43 o'clock |
55 % at 16:37 o'clock |
0 at 9:29 o'clock |
|
| Maximum | 24.4°C at 15:34 o'clock |
17.8°C at 11:49 o'clock |
96 % at 8:43 o'clock |
4 at 15:31 o'clock |
Because of the lower night temperature the relative humidity often increases to these hours and sinks with the sunrise.
The variations in the course of the day of the humidity turn out much more strongly than the low variations with the dewpoint. With increasing humidity also the leaf wetness increases and the evaporation decreases.
Beside to values above other measurement variables are available: