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%.
Dry air is good, but wringing moisture from the air is energy-intensive. Keeping your indoor humidity low is generally a good idea. During the winter, lowering the indoor humidity is easy (and relatively cheap): all you have to do is operate a ventilation fan. If you bring in cold outdoor air, the outdoor air will be dry. (Cold air canât hold much moisture.) The longer you run a ventilation fan, the lower your indoor relative humidity.