Weather conditions are also a key aspect of any pavement or asphalt project. Temperature and humidity can have a direct effect on asphalt and how quickly it will harden. For asphalt to cure correctly the right amount of time requires the right type of outside temperature. Outside air moisture and overall weather conditions must be had. The best conditions for an asphalt project should be around 60 degrees with low humidity. When it is too cold or too much moisture present the asphalt may take longer to harden or cure.