It's text.
I'm displaying the amount of sunshine hours on that day. In a somewhat dynamic way.
Here's the index_hook_after_station_info I'm using.
#set sunshinetime = $day.sunshineTime.sum.raw
#set sunshinetheoretical = $day.sunshineTheoretical.sum.raw
#set ratio = 0
#set hours = int($sunshinetime / 60)
#set minutes = int($sunshinetime - ($hours * 60))
#if $sunshinetheoretical > 0
#set $ratio = $sunshinetime / $sunshinetheoretical
#end if
#set $hoursstr = str($hours)
#if $minutes < 10
#set $minutesstr = '0' + str($minutes)
#else
#set $minutesstr = str($minutes)
#end if
#set $sundurationtext = $hoursstr + ':' + $minutesstr + ' Stunden'
#if $sunshinetheoretical > 0 and $current.sunshineTheoretical.raw == 0 and $sunshinetime > 0
#set $suntext = 'Heute gab es insgesamt ' + $sundurationtext + ' Sonnenschein.'
#else if $sunshinetheoretical > 0 and $current.sunshineTheoretical.raw == 0 and $sunshinetime == 0
#set $suntext = 'Heute gab es leider gar keinen Sonnenschein.'
#else if $ratio >= 0.7
#set $suntext = 'Heute gab es schon ' + $sundurationtext + ' Sonnenschein.'
#else if $ratio >= 0.4
#set $suntext = 'Heute gab es bisher ' + $sundurationtext + ' Sonnenschein.'
#else if $ratio < 0.4 and $sunshinetheoretical > 0 and $sunshinetime > 0
#set $suntext = 'Heute gab es erst ' + $sundurationtext + ' Sonnenschein.'
#else if $ratio < 0.4 and $sunshinetheoretical > 0 and $sunshinetime == 0
#set $suntext = 'Heute gab es leider noch keinen Sonnenschein.'
#else
#set $suntext = ''
#end if
#set $dailyrain = $day.rain.sum.raw
#if $dailyrain == 0
#set raintext = 'Bisher kein Regen.'
#else
#set $raintext = 'Bisher ' + str($day.rain.sum) + ' Regen.'
#end if
<br>
<p align="center" style="font-size:24px">
$suntext $raintext
</p>
<br>