Blood Moon

Blood Moon lets your fruit become Bloodlit, a x4 mutation that Full Moon can also cause, with a slightly higher chance. Beyond that, the wiki carries a long history for this weather: after it was released, the first two Night events were manually changed to Blood Moon by an admin, and after the poorly received cosmetics update, Night and Blood Moon were added back as an apology until the next update.

With the Bizzy Bees update, Night, Blood Moon and Meteor Shower all became permanent events, appearing every 4 hours. Most weathers last roughly 3 to 5 minutes, so that is the window to expect. The Kappa pet can swap a Wet mutation for Bloodlit, and the Hex Serpent is another pet that can apply it.