I agree with each of the comments on temp and humidity and their effect on CA, but there is a way to overcome the climatic changes. My personality disorder
requires me find out why something is doing what it does, or how to get around it. That drives me to stop my pen making or woodworking at the moment and work on the "problem" and make it an "adventure" to solve. "Solving" the problem for me is just experience that helps down the road.
Really, I do that. So, cool & humid, cool & dry, hot & dry, hot & humid - I just make minor adjustments the same way most of us do when driving changes from dry to rain, or from dry or wet to snow. Most of us make mental changes and adapt to these changes in driving situations.
IF we take the time to "play" with CA characteristics in the different climatic situations, it is not hard to achieve a good finish regardless.
Trying to
make it work (CA finish in changing situations) so that we can finish the pen - usually complicates the situation and ends in frustration. It helps when we take advantage of the situation and put the pen aside and "play"with a few pieces of wood blanks until we have a good handle on the CA characteristics in that environment. VERY Helpful!