I try for a little less of a swing, maintaining a more even keel would be better. Most things can tolerate either of those extremes for a while but don't like the wide variation. If you have the ability to keep it between 50 and 80 that would be better. I am more used to centigrade measurements so give or take a few degrees. you will have micro climates hotter and colder within your greenhouse as well so measuring air temperature in the center would be more of an average. hotter up high and in direct sun, cooler down low and in the shade so that helps to determine where to place your trays. It's all an imprecise balancing act in my greenhouse and every greenhouse is different. Requires a lot of attention and monitoring in my area especially in early spring when I have to heat it.
KarenO
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