ion from Lincoln, Nebraska, from 2016.
Originally downloaded from Weather Underground by Austin Wehrwein, http://austinwehrwein.com/.
The variables are listed below. Most are self-explanatory. Max, mean, and min measurements are
calculated relative to the specific day of measurement.</p>
    </div>

    <div class="section level2">
    <h2 id="ref-usage">Usage<a class="anchor" aria-label="anchor" href="#ref-usage"></a></h2>
    <div class="sourceCode"><pre class="sourceCode r"><code><span><span class="va">l