## Data

The atmos data set resides in the nasaweather package of the R programming language. It contains a collection of atmospheric variables measured between 1995 and 2000 on a grid of 576 coordinates in the western hemisphere. The data set comes from the 2006 ASA Data Expo.

Some of the variables in the atmos data set are:

• temp - The mean monthly air temperature near the surface of the Earth (measured in kelvins (K))

• pressure - The mean monthly air pressure at the surface of the Earth (measured in millibars (mb))

• ozone - The mean monthly abundance of atmospheric ozone (measured in Dobson units (DU))

You can convert the temperature unit from Kelvin to Celsius with the formula

$celsius = kelvin - 273.15$

And you can convert the result to Fahrenheit with the formula

$fahrenheit = celsius \times \frac{9}{5} + 32$

For example, 282.15 degrees Kelvin corresponds to 9 degrees Celsius.