Aphid Risk Model

AphidRisk Conditions: in the morning when sun raises and relative humidity decreases, optimum temperatures between 20°C and 32°C - good flight is indicated. 

If temperatures are not in the optimum range (to cold/hot) or it is too wet (leaf wetness) risk decreases.

Output is the daily risk.
So optimum temperatures and falling relative humidities during the morning are indicating a good flight day. When it is wet during the night and temperatures are to low this is bad for propagation. The same when it is hot and moist during the day.