what does the temperature outside have to be to be freezing?

It has to be 32F or 0C or lower. But temperature can vary depending on the geography of the land. For instance even tho the temperature for a given area is … say ….35F there may be low lying areas where the temperature is below freezing.

I wish him well on his journey

Beulah

Yes, you can as long as you remember that electronics that require power can drain a battery to exhaustion much faster in cold temperatures then they would when it’s warm. This is especially true for GOTO telescopes who use significant amounts of power. Bring an extra power tank or battery along, and make sure to have dew heaters on the finder scope, diagonal mirror if your telescope has an open tube and on the corrector or objective lens if you have a catadioptric or refracting telescope. Otherwise frost can form and shut you down for the night. Dress very warmly, as though it’s 20 or 30 degree colder than the thermometer indicates because you won’t be moving much and generating much heat. Pay particular attention to keeping your head, feet and hands warm. You don’t want to touch freezing metal when it’s 10 below outside barehanded. Make sure your vehicle is dependable. I advise against going out into the hinterlands in sub-zero cold or cold weather mixed with strong winds because death can occur within minutes out there from hypothermia. When it’s 50 below, I would either observe from home, or not at all. That is deadly cold weather to be outside for any reason. Not only that, lubricants can solidify, motors can stop working and batteries can fail in killing cold like that. Not even animals go out in that if they have a choice. It can be really hard to observe when it 20 degree above zero between the gusty wind and the dampness that occurs here in the Southern U.S. Know what the warning signs of hypothermia are also, it can sneak up on you and before you know it, you’re in deep trouble. The first sign is suddenly feeling very warm all over, then confusion and disorientation sets in. At least take along a sleeping bag and extra clothes and let someone know where you’re going and when you’re coming back. Take along a mobile phone too, it could be the difference between getting home and a long unpleasant stay in the frigid outdoors at best. Make sure your vehicle can handle the terrain you’re driving over. Needless to say, a small front-wheel drive car will get stuck on ice covered ground full or ruts, which is the norm when you’re taking to unpaved roads or worse. Merely freezing temperatures can be accommodated with little difficulty, but be careful. I do more observing in the winter than any other time because the skies are darkest and the nights longest. With dew heaters on my telescope, a powerful battery that can cope with both the cold and the load placed on it and multiple layers of clothing and warm boots suited to the weather, I have no problem observing all night long when the temperatures are near freezing. The coldest weather I ever observed in was around zero degrees, after two hours of which I was forced to quit because my hands and feet started to freeze. Taking a thermos full of coffee or hot chocolate also helps keep you warm, as well as some snacks.

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It sure can. I live in an area that reaches temperatures just as you described (Northwest Territories, Canada) and telescopes work just fine. Actually, cold winter skies are typically clearer since there is less humidity. There are a few words of warning I should give, though. As you can imagine one of the toughest parts is keeping your hands warm. You need to find gloves that are thick, but not so thick that you are unable to work the equipment, else you’ll be taking your gloves off every 10 seconds. Also, especially if you are using a refractor, make sure your scope has PLENTY of time to cool down to the temperature of the environment it is in! Refractors suffer from this especially because the lenses are sealed in a tube and the air inside does not change temperature as quickly as, say, a Newtonian or a Dobsonian which is open to the air. Even with Newtonian and Dobsonians, however, you want to make sure your mirror has had enough time to cool. Consequently, one of the best places to keep the actual tube assembly of your telescope and eyepieces when not in use is in a shed that is protected from the elements, but not heated. Then you won’t have to wait for your scope to cool down. And, lastly, as with observing in any temperature or locale, try to do it on a night when it is not windy. Not only does it make for more comfortable observing, but you’ll find the atmosphere is usually a little more cooperative (less flickering and atmospheric interference). Hope this helps. Enjoy observing, and try to keep warm. ?

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RE:

what does the temperature outside have to be to be freezing?

my husband is driving big rig cross country and i am wondering

What Temperature Is It Outside

like below 32 degrees fahrenheit or sumtin

well officially… it has to be 32F or 0C or below…

0C