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 REALTIVE to the temperature, hence relative humidity. You should look at the DEWPOINT, which is the way to tell how muggy the air really is. 10 degrees with 73% humidity is DRY, because the colder the temperature gets, the LESS MOISTURE that the atmosphere can hold.