I'm in northern Alberta, Canada. Technically we are in summer but daytime temps outside are only around 22 deg this year. The tent is in my basement so it's cooler. The thermometer tracks max temp and it's only reached 25.5 deg. I do have 200 watts of citizen CLU 048 COBs right over that plant so I think I was giving it too much light. The other 2 plants are not showing signs of foxtailing. Moved the light higher will see how it goes from here. I'm going to be pressing this batch into rosin to make oil with so appearance doesn't matter so long as it doesn't effect the yield too much.