MIKE MOSS SAYS:         Pat,     There is a detailed standard established by the American Society of Heating, Refrigeration and Air-conditioning Engineers called ASHRAE Standard 55-2004 that may contain some tables or charts that directly address your question, but they are not readily available online and ASHRAE chagres $47 for the publication. I did find a couple of links you may want to look over that briefly address indoor temperature versus humidity and associated human comfort levels. See

http://www.ccohs.ca/oshanswers/phys_agents/thermal_comfort.html

Other WRAL Top Stories

and

http://www.infoplease.com/ipa/A0001412.html

The second address includes a link to a simple "apparent temperature" table that relates relative humidity and temperature to a "feels like" value, but it would be a judgement call as to where a particular individual would be most comfortable with in that chart.

Hope that helps a little.