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Winter Dry Bulb:  This value represents the lowest outside dry bulb air temperature that occurs in the specified city and is listed as the 99% Dry Bulb temperature in Chapter 1 of Engineering Weather Data.  It can range from -50 to 100 degrees F.

Winter Wet Bulb:  This value represents the wet bulb temperature for this city at the design winter dry bulb temperature.  It is only used in Rhvac when you select to perform humidification in the winter.  By default this value is set to the wet bulb temperature that corresponds to this city's winter dry bulb and the Manual J recommended winter outdoor relative humidity of 80%.

To reset this value to the wet bulb temperature that corresponds to the current city's winter outdoor dry bulb and Manual J's recommended 80% relative humidity, click the item in the list at the bottom of this input's dropdown help window.