The thermal imager indicated a ground temperature of 35 degrees and a cloud temperature of 7 degrees. The weather station indicated that the air temperature was 58 degrees and the dew point was 36 degrees. This is a difference of 28 degrees and 22 degrees respectively.
Assuming a dry adiabatic lapse rate of 5.4 degrees per 1,000 feet, this indicates the cloud altitude is 5,200 feet and 4,100 feet. That's an average of 4,600 feet AGL.