Optimal Running Temperature?

Somewere around 55-60 degrees, compensating for the wind chill factor.

i don't think there is one answer.  Everyone has their own comfort zone.  I think the cold would start affecting your skin long before dropping your core temp while running.

personally I prefer 40's to 50's.

I also enjoy the cooler temperatures.  Anything below 30 is too cold and anything above 85 is just miserable.  But that is with Oklahoma humidity...

Personally, 40-50 degrees is perfect.

95 and sunny is what I prefer.

I think that 40F is the sweet spot.

I ran this weekend while it was 13F, not to mention that wind that put the temps below zero according to the radio.  I stayed really warm, maybe too warm, and sweated quite a bit.  Needless to say, it was not ideal.

~B

I have really enjoyed the past few weeks of upper 40's low 50's this is perfect for me.  But I also enjoy upper 60s because of the added warmth. 

I don't like the in-between...when you aren't certain what to wear.  Either layer up or take stuff off.  I just need to know so that I am comfortable running.

But who am I kidding?  I live in Georgia and trained for HIM this summer.  I postponed runs until after 8:30 because that was the first time it would dip below 90 and was 'manageable.'

Mike - you might want to clarify.  Are you asking people what temp they like to run in?  What temp they perform their best in?  Or if there are any theories or statistics out there on what THE best temp to run in is?  In other words, is there a temp at which you have the ultimate combination of best temp for the body to cool itself, take in oxygen, etc?  I THINK you are asking the last kind of question, but I'm not sure. 

Just read an online article last week about marathons (can't remember where at the moment) that listed the 45-55 degree range as the fastest.  It actually listed the expected increase in times for temps above 60 degrees.  If I recall the link, I'll post.

 Personally, I find 50-55 to be the fastest and most comfortable.