The phrase "actual temperature" refers to the real or true measure of how hot or cold something is, rather than an estimated or approximate value. Full definition
But even today, we are finding it very difficult to reconcile actual temperature trends with our expectations. (globalwarmingsolved.com)
Any comparisons of models or actual temperature records will therefore depend on whatever «normal» period they are being compared to. (judithcurry.com)
If you looked at this thermometer before it had fully adjusted to the outside temperature, you would see a cooling trend that has nothing to do with actual temperature changes outside. (realclimate.org)