We have experienced a very warm winter here but only once can I recall a very low humidity reading…although I have had some doubts to the accuracy of the high end…it was extremely foggy and wet here and the highest reading I have ever recorded was 88%, some other stations within a few miles of me were recording in the high 90’s. I noticed one day a very dry mass of air moved in and I recorded a 19% humidty for about 20 minutes or so and it gradually moved up to around normal which for this time of year here is around 50 to 60%. Those are very cold temps do you have any other instruments or nearby stations to gauge your stations accuracy concerning humidity? I have checked several times and it appears at least my low readings are consistent with nearby stations. I am considering adding an extra humidity sensor using the “one wire” system…as a backup.
Jon