Climate

Spring

• Biomes change to give a spring appearance.
• Flowers grow naturally.
• Accelerated crop growth. Crops have a low chance to fail.
• Farm animal breeding rates below-normal.
• Increased chance of rain.

Summer

• Biomes change to give a summer appearance.
• Normal crop growth. Crops do not fail.
• Normal farm animal breeding rates.

Fall

• Biomes change to give an autumnal experience.
• Crop growth rate cut about in half. Crops have a small chance to fail.
• Farm animal breeding is reduced.
• Winter is coming [tm].

Winter

• ... is here.
• Snowmen everywhere.
• Biomes change to give a winter experience.
• Near-constant snow, which accumulates on the ground.
• Crop growth rate extremely low. Crops have a high chance to fail.
• Farm animal breeding greatly reduced.

Certain block types are known not to accumulate snow. They include:

• Bricks
• Endrod
• Fences
• Glass
• Glowstone
• Ice
• Lantern
• Lava
• Pane
• Plate
• Signs
• Slabs
• Stairs
• Trapdoor
• Water