But that is the thing. Human senses are not very good at monitoring a few tens of percent change in humidity, but it can affect skin, nasal passages, plants, insects etc. You need a weather station to monitor it properly.
Right now, my outside humidity is 68% and I am about 100 feet from a bay filled with Pacific Ocean water. However, our hive is keeping humidity at 40-55% according to the Arnia hive monitor data. So they have a pretty good chance of fanning and evaporating their nectar down, even though we are coastal. 
If we weren’t coastal, I think they would do it even faster.
My bees are Italians, probably yours and your Mum’s are too. 