Asphalt paving cannot be completed while it is raining. Paving must also be delayed if it has rained recently enough for the ground to still be wet.
While paving companies would like to be able to complete jobs during any weather conditions, asphalt is made of a mixture that contains oils. These oils repel water, and laying asphalt while it is actively raining will cause unintended results that affect the quality of the project.
The repelling of oil from water means that cracks or holes may form in asphalt that is laid during rainy weather. These cracks can quickly turn into potholes, and it is even possible for potholes to form when asphalt is laid on wet ground after it has stopped raining.
The damage and quality concerns related to laying asphalt in wet conditions can be observed immediately. The oil that separates from the asphalt as it repels water will rise to the top of the newly surfaced road or parking lot. Craters may form if it is raining immediately after the asphalt has been laid.