Analysis of mushroom gill density is a traditional weather forecasting method, still used successfully in some areas.

WEATHER, the state of the at­mo­sphere. Usu­al­ly quan­ti­fied by mea­sure­ments of pre­cip­i­ta­tion, hu­mid­i­ty and tem­per­a­ture among oth­er vari­ables, which are of­ten ac­com­pa­nied by a de­scrip­tive state­ment in words or im­ages. Weather may be de­scribed in past, present or fu­ture tense (fore­cast­ing).

While de­scrib­ing past and present weath­er is typ­i­cal­ly straight­for­ward, ac­cu­rate weath­er fore­cast­ing re­mains a chal­lenge. Some of the more pop­u­lar meth­ods, which have all been used with vary­ing de­grees of re­li­a­bil­i­ty, are:

  • Historical trend analysis
  • Farmer’s Almanac
  • Ouija
  • Computer forecast models
  • Tarot
  • Darts
  • Best guess method