Temperatures for garden publications should be in Fahrenheit degrees in the following forms:
For positive degrees, place the number, followed by the degree sign (option-shift-8) and a capital F. There should be no spaces between the elements.
The average January temperature is 35°F.
The temperature should be 40°F–60°F.
For negative degrees, use an en-dash to create the negative.
The average February temperature is –35°F.