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what is annual range of temperature?
The annual range of temprature is defined as the difference between the hottest and coldest months, taking monthly mean temperatures in each case. It is given approximately by the difference between the average of the January maximum and minimum temperatures, and the corresponding average for July. We will call the January/July difference the apparent annual range. The error in assuming that the January and July temperatures are the hottest and coldest (or vice versa) is small at latitudes above about 40 degrees.


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