Sorry ICS Vortex for the delay in getting back to you I've been a little busy lately.
From the 7 days to die wiki this is what it says for the Temperature Effects
HEAT 90 degrees to 100 degrees Thermometer icon appears on screen to help you track the temperature. Your avatar will make "whew!" sounds to show that it is hot but there is no penalty at all. You do not need to try and keep your temperature below 90 degrees.
100 degrees to 110 degrees The Sad Sun icon appears on screen so that you know that you are losing hydration and will have to drink water more often. Your avatar continues to make sounds related to being hot but as long as you have plenty of water there is no need to remove clothing or armor or alter your playstyle while in this range.
110 degrees to 120 degrees At this point you lose hydration and stamina. You will get messages pleading with you to find shade, water, and to rest.
120+ degrees At this point you lose hydration, stamina, and health until you die.
You can enjoy your time in the desert with no to very mild ill effects all the way up to 110 degrees.
Thus, with smart use of yucca juice, shade, and oases it should be very manageable to stay within the range of 97 - 106 degrees and not have to change clothing all the time.
COLD 40 degrees to 30 degrees Thermometer icon appears on screen to help you track the temperature. Your avatar will make "brrrr" sounds to show that it is cold but there is no penalty at all. You do not need to try and keep your temperature above 40 degrees.
30 degrees to 20 degrees The Snowflake icon appears on screen so that you know that you are freezing and will have to eat food more often. Your avatar continues to make sounds related to being cold but as long as you have plenty of food there is no need to rush to add clothing or alter your playstyle.
20 degrees to 10 degrees At this point you lose food and stamina. You will get messages pleading with you to get warm using clothing, shelter, and a fire.
10- degrees At this point you lose hydration, stamina, and health until you die.
Play in the snow biome by maintaining a temperature range of 38 - 15 degrees which is totally doable using a fireplace strategically and getting to shelter when necessary.
The one that bugs me the most is the hot sun / heat stroke. If you have to make pools of water to stand in and some sort of quick shelter with a roof to cool off every 30 seconds if kills the game play. you cant run or attempt to search more until the effect is gone.