I was watching a Tristan Gooley (Natural Navigator) video on YouTube, where he shows how to tell north from where certain rusty shades of tree lichens grow on tree trunks. Find a couple of large patches on a lichened tree and you can be sure where north is. It seemed to need a new mnemonic rhyme for children, so I made one…

  Round and round the trunk we goes,
  to find the way the wind a’ blows.
  Where large the rusty lichen grows,
  to that way point your northy nose.
  Now sniff the wind, and off we goes!

Once you know where north is, and can tell from that what the prevailing wind direction is, then all sorts of natural indicators become available from that. Such as cloud movements seen inside woods, which side of copses birds are sheltering on, where spiders have spun webs on bushes, and suchlike.