Sounds about right. Most plants can handle temps between 55F and 105F with decent stride in my experience. Plants don't rely on just temperature alone to thrive. Other environmental factors are much more important in my opinion.
Well, I'm observing alaskans growing Ruderalis hybrids outside, or at least finishing them outside in the summer months, we can say there must be a population that does well in lower temps. As long as you are making unbiased observations on what works best, but your 67F temp is on the low end of the temp looking at the community average I came up with. Im not telling you that you are wrong or right.. Its just an observation.
Nah, it's cool. Relative temp is 59F right now at 5 days old. Canopy is at 73. They love it. Transpiration man. Nice gap between root and canopy temp makes them sweat haha.
I didn't say temps weren't important. I just feel that other factors outweigh temps. Just like your experience has shown. Temps aren't the end all be all of growing.temperature has much more to do with biological processes than simply transpiration. any and all enzymatic activity, terpene development, formation/uptake of nutrients and products in the plant as well as efficiency of, including photosynthesis, chlorophyll formation etc etc. bacteria are working harder. i mean everything is sped up with increased heat.
i have nothing else to say on tjhe matter, not really paying attention. just throwing out that temp doesnt simply effect water uptake and transpiration.
ive had seedlings and harvested in freezing temps with a few inches of snow. ive had seedlings and harvested in +100° temps. the plant is hardy, its hard to be objective aboutbgrowth without running clones and trials.
many of us experienced growers have actually done just that
Used to guerilla grow like this. Put 6-8 plants in one spot with the goal of keeping 1-2.
I have no opinion on how you run your garden, I'm looking at is the range based on community numbers, I'd like to do a light depro greenhouse, I'm trying to see the limits on temps. Kinda using your numbers as a reference.. If you can do it at 67, (and it seems possible looking at the math) why cant I? .
Same here. I will admit though, I do baby my outdoor plants a little with some shade in the heat.
Yeah that's 20 degrees difference that seems like a lot
Stating what I do. Don't think it's a good idea, don't try it.
So according to this VPD chart, as long as I keep my RH% inbetween 75% and 80%, then for the most part I pretty much can't go wrong no matter what temperature I'm in... 
is this correct?As long as you keep your humidity in check, they're fine in low temps.
I know, I know. I cold grow all the time though. Never any issues. Got sick of contending with winter temps and just learned to grow in them.
