I do remember covering this briefly in the discord, but I figure I'll put it here so people can vote on it.
Add a temperature testing area, in its own tab. Like the planetary sim and the racecourse. This zone will feature a temperature slider to adjust the local ambient temperature of the testing area in the UI. This slider will be able to vary the temperature between -100 and +100, and there is a text box for precisely editing the number outside those ranges.
Feel free to take and change this suggestion so it better suits the game, and add any criticism to the comments