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%.
Spread cat litter on a shallow baking pan and place in an out-of-the-way area of the room to lower the humidity. The absorbing qualities of the litter will draw moisture from the room.. Measure the humidity in the home using a hygrometer. The humidity in the house should relate directly to the external temperature. If the outdoor temperature is below 15 degrees Fahrenheit, the humidity should be less than 35 percent.