Tatter wrote:Would be a very good idea to buy a couple of those cheap hygrometers and place them at different spots in your cabinet. Temp and RH can vary to surprising amounts, depending on how good or bad your air flow is. In general, it will be hotter and drier on the highest shelf, and cooler and more humid on the lower shelves (great conditions for mold). That is, unless you've got some decent air flow system to keep things more steady.
At 22 C and 72% RH, that puts the dew point at 17 C, meaning that if the temperature drops just a few degrees you will get wet condensation on your teas. At 79% RH the dew point is 18 C. Definitely want to keep a close eye on things.
I'm not a physicist, but my understanding is this. 17C and 22C are 62.6F and 71.6F respectively ... 9F apart. I'm not sure about Maitre's findings, but my pumidor (similar design as solitude's) doesn't shift that much very often. One of the benefits I've found with this system is that the fish tank water heater helps keep a more stable temperature, decreasing the likelihood of any drastic temperature changes leading to condensation. And when the temperature does shift, the RH is shifting simultaneously, which in turn changes the dew point of the system.
My numbers since 2/22/13, have ranged anywhere from 68F and 77% RH to 79F and 65% RH ... and just about everything in between.