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4 Temperatures for growing orchids
In nature orchids inhabit various habitats, from low land rain forests to mountain slopes, to swampy areas. Therefore we can expect some orchids to need the warm conditions of a tropical rain forest, others to need the cool conditions of a slope on the foothills of mountains and yet others to have needs somewhere in between.
Orchids are classified in 3 temperature groups: orchids that require cool temperatures, other that require intermediate temperatures or others that need warm temperatures.
Here are the temperature ranges for the three groups, and please don’t hold me to the degree, as you’ll most probably see different ranges somewhere else:





Please notice the difference between day time and night time temperatures.  In the natural world it is, most of the time, warmer in the day and cooler at night.
So when you grow your orchids keep this in mind, especially if you grow them in a bathroom which many of us, in the winter, tend to warm in the morning, then let it cool during the day, then warm it again at night.
But remember these temperatures are ideal ranges and, within reason, you can acclimate your orchids to grow pretty well a few degrees outside of these ranges.
Your warm growing orchids will not die if they are subjected to day time temperatures of  90 degrees for a few days or to 55 degrees for a few nights.  But at these temperature levels your orchids will stop growing and will become more susceptible to insects and diseases, because there will be under stress.  
Winter
70
65
60
Summer 
85
80
75
Winter 
60
55
50
Summer
75
70
65
 Day time
Night time

Warm growing orchids
Intermediate growing orchids
Cool growing orchids