It depends.

I know that sounds vague, but it is correct. Remember that official temperatures are taken at stations around the country and in the shade. So the reported temperature for a town/suburb/city can be not what the temperature is at any other specific location. Also as the official temperature is taken in the shade, any bit of direct sun exposure can have a dramatic impact on the actual temperature that your gear is exposed to.

Same thing happens when you go the other way. Go to Antarctica and one of the first thing you will notice is batteries no longer stay charged. As batteries get colder they do not provide enough power to run cameras. Which is why when you go somewhere like that, the standard operating procedure is to place your charged batteries under your clothing, close to your skin, and take them out, put them in the camera when needed only.

Extremes of temperature, either way, can seriously impact your gears functionality.