 href="https://dplyr.tidyverse.org/reference/filter.html" class="external-link">filter</a></span><span class="op">(</span><span class="va">NOAA_df_1990</span>,</span></span>
<span class="r-in"><span>  <span class="va">proc</span> <span class="op">==</span> <span class="st">"Tmax"</span> <span class="op">&amp;</span></span></span>
<span class="r-in"><span>  <span class="va">month</span> <span class="op">==</span> <span class="fl">5</span> <span class="op">&amp;</span></span></span>
<span class="r-in"><span> 