The observer will round the entered data to whole units Fahrenheit by rounding up all positively
signed values between T.5ºF and T.9ºF inclusive, (i.e., + 66.5ºF to 67ºF), and rounding down
positively signed values between T.1ºF and T.4ºF, inclusive. For sub-zero temperatures, special
attention is given to –T.5ºF values, to round it down. This method is known as ‘round half up
asymmetric.’ For all negatively signed values between -T.5ºF and –T.1ºF, inclusive you round
down (i.e., -3.5ºF to -3ºF) to nearest integer. For negatively signed values between –T.6ºF and–
T.9ºF, inclusive, the data is rounded up (i.e., -10.6ºF to -11ºF) to higher absolute value