I have a remote sensing temp/RH/barometer etc. station inside with a remote in a tree out in the pasture. It's fairly new, from HD or somewhere. Calibrating the RH feature was a royal PITA. Before calibration it gave me all sorts of goofy readings that I knew weren't remotely right. I still don't entirely trust the indoor humidity readings but the outdoor numbers are very close to the NOAA readings for my area at any given point in time. I don't use AC so it's not an issue indoors. When the salt won't shake I know it's effing muggy.

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You're a daisy if you do.
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84 Euro 240D 4spd. 220.5k sold
04 Honda Element AWD
1985 F150 XLT 4x4, 351W with 270k miles, hay hauler
1997 Suzuki Sidekick 4x4
1993 Toyota 4wd Pickup 226K and counting

My humidity runs around 50-55% year-round. My thermostat is a newer electronic one, but either it's out of whack, or my thermometer is goofy...the thermostat says 76 degrees, the analog thermometer says 72. The thermometer is part of a 3-piece item from the 60s with thermostat, barometer and hygrometer. Either way, I'm comfy and all is right with the world, aside from the condensate overflow on really hot days...a dribble of water runs out onto the floor from the closet where the system is located.

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2002 Ford ZX2
2 x 2013 Honda Civics

Dave,
Suggest you upgrade to a digital one. Their accuracy is worth it in the setting/readings. The base models are real cheap (about $10) as in inexpensive. Walmart Supercenters even sell the entry level digital thermostats, if you're not near either a Home Depot or Lowe's.