Originally Posted by
JanMM
If 65F is the air temperature, might seem a little cool if not sunny but shouldn't be a problem.
Are you on the drops most of the time?
Can you flip your stem to raise the bars a little?
Try to get the seat and handlebar at the same height they were on your mtb. Mostly level or what ever. JanMM pointed up the probable cause. If you ride on the flats most of the time it should be about like your mtb. Since seat height can't be changed a different stem may be in order.