See also: Dealing with Breathing Problems written for patients. The term hyperventilation describes excessive ventilation of the lungs, beyond what is required to achieve normal arterial blood gases.
A light frost occurs when the temperature drops to below 32 degrees Fahrenheit, and refers to the conditions that allow a layer of ice crystals to form when water vapor condenses and freezes without first becoming dew. Harvest basil and other tender herbs before a light frost (when the temperature drops to 32 degrees Fahrenheit). 2  Even if they survive the frost, they don't do well in cold temperatures. 3  The same is true for most annuals.
But, a light frost can form with an average air temperature somewhere between 33 and about 37/38. Some surfaces radiate heat better than others, which is why you will get frost at times on elevated surfaces such as car windshields, blades of grass, roofs, or mulch when nothing else is frosty. hard or killing frost is when it gets below 29 or sub-freezing temps are prolonged (more than 24 hours). Plants are much better able to survive a light frost. Once you get below 28 degrees and beyond 6 hours below freezing, plants are much more susceptible to damage. Like Bookmark March 26, 2012 at 11:02PM.