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%.
Humidity is simply the amount of water vapor in the air. The warmer the air, the more water vapor it can hold, which is why tropical areas tend to feel very humid. Relative humidity is the amount of water vapor the air can hold RELATIVE to how much water vapor that air can hold. It is temperature dependent. As air warms and cools, its relative humidity will fall and rise even though the amount of water vapor does not change.