"Intense cold" refers to a very strong or extreme level of coldness. It means a temperature that is exceptionally low, where the surrounding environment or objects feel very frigid and freeze more quickly. Full definition
There's no getting around it: the Irish winter can be dire, full of media predictions of intense cold snaps. (elitesingles.ie)
After just three minutes of intense cold, I felt like I could run a marathon. (wellnessmama.com)
Another theory is that three minutes of such intense cold is enough stimulation to make the body think it is in a survival situation and to ramp up the normal immune process in the body. (wellnessmama.com)