seed starting and temperature range

I recently purchased an inexpensive plastic covered metal frame small greenhouse. I am trying to start seeds in it. Temperature regulation is difficult. What are the extremes of the temperature range to start the seeds with out freezing or cooking them?
Submitted by BHGPhotoContest

Get a soil thermometer and you will find that onions, s pinach and parsnip seeds will grow in soil above freezing; radishes, carrots and cabbage in soil above 40 F.; corn, asparagus and tomatoes in soil above 50; squash, cucumber, beans and melons in soil above 60. For starting seed,you'll have better luck in early spring if you get a heating pad made for seed starting and put that under your flats of seeds. You greenhouse must have the ability to ventilate if it gets too hot.

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