Melons need a sufficiently moist soil, but do not tolerate high humidity.
The humidity in cold frames and small greenhouses can be regulated quite well by ventilation, while with foil tents it can be somewhat problematic in this regard. After planting, you ventilate as little as possible. Important is, that the temperatures do not drop below 15 ° C. So you have to go at night, often into June, with mats or similar. ä. cover. As the outside temperature rises, ventilation is correspondingly more frequent and more extensive. In summer, the windows can also be completely removed during the day if the weather is free from precipitation. In contrast to cucumbers, melons are not shaded under glass, even in the strongest sunlight.