So in general, regarding perishable foods like meat, most dairy, unshelled eggs and shell eggs (in the US) , cooked casseroles, and so on: if the food (or its perishable components) have been at room temperature for more than two hours, you should discard that food.
This directly effects how comfortable it will feel outside. Many times, relative humidity can be misleading. For example, a temperature of 30 and a dew point of 30 will give you a relative humidity of 100%, but a temperature of 80 and a dew point of 60 produces a relative humidity of 50%.
Best Answer: Ah Judy, there isn't such a thing as an average relative humidity. This is because it changes a lot only in the course of the day. How much moisture the air can contain depends on the temperature. The warmer it is, the more moisture it can contain. That is the absolute humidity that is the volume of water per volume of air. The relative humidity, which is what you measure with a hygrometer, is the percentage of moisture to achieve full saturation for a given temperature. But since the temperature varies a lot during the course of a day, so does the relative humidity.