Here's why:

* Earth's temperature varies greatly depending on location: It's much hotter at the equator than at the poles. Mountains are colder than valleys. The temperature also varies by season.

* We talk about average temperatures: Scientists measure and track average temperatures over time. These averages give us a general idea of Earth's climate.

Here are some common temperature references:

* Average global temperature: This is around 14 degrees Celsius (57 degrees Fahrenheit), but it's constantly changing.

* Average surface temperature: This is typically around 15 degrees Celsius (59 degrees Fahrenheit).

* Average air temperature: This is about 14 degrees Celsius (57 degrees Fahrenheit).

To get the temperature in a specific location, you'll need to use a weather app or website.