Its only 50 degrees out & kind of windy, partly cloudy...think its too cold to take my 3 wk olds out for an hour or 2?
This is replying after the fact but the recommended temperature for maintaining healthy chicks is to have them in a brooder with a temperature of 95 degrees. You then reduce the temperature by 5 degrees per week until they are fully feathered at about 6 weeks. So the recommended temperature for 3 week old birds would be 80 degrees. That being said I have always started at 90 and reduced by 10 degrees per week and have never lost a chick.
While you might have been rushing it a little having them out today you probably won't have any problem for no longer than you had them out. When you take partially feathered birds outside you need to be aware that wind (chill factor) will still be a factor on a day like today.