The weather station indicates the air temperature is 77 deg and the dew point is 45 deg. That's a difference of 32 deg.
Assuming a dry adiabatic lapse rate of 5.4 deg per 1,000 feet, the overhead cirrus clouds are at an altitude of 13,000 and 5,900 feet respectively.
I am going to assume the thermal imager is the better value. By the way, the temperature of the cloud-free sky is on the order of -30 to -35 degrees.
|Thermal image of the overhead cirrus clouds|
|Visible image ofthe cirrus clouds overhead|