Purpose and how to use it

Increase the weather bonus on matching crops.

The Windmill strengthens the matching-weather bonus, not the entire crop value. A +20% weather bonus becomes +30% with a max-level Windmill; Celestial Night’s +25% becomes +37.5%. The matching weather and Windmill benefit are recorded when planting.

Click the building on your farm to open its menu. Moving a building changes its location, not its owned level. Farm editor placement rules explain entrances and walking access.

Where to get it

The Windmill is included with your farm at Level 1; you do not buy a separate building from the seed shop. Find it on My Farm and click its model to open its menu. If you stored or moved it, open Edit Farm → Buildings, select the owned building and place it again. Its level improvements are purchased from its own menu, not by buying another copy.

Every level: benefits, costs and requirements

Exact rule at building level L: Weather-bonus strength increase fraction = (L − 1) ÷ 48. Percentage displays are rounded to at most four decimal places; the fraction above defines the exact calculation.

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Complete Windmill upgrade table
LevelBenefitCost to reach (coins)Cumulative coinsFarm levelAppearance
10% stronger weather bonus001Country Mill
22.0833% stronger weather bonus1,5001,5001Country Mill
34.1667% stronger weather bonus2,5004,0002Country Mill
46.25% stronger weather bonus4,0008,0003Country Mill
58.3333% stronger weather bonus6,00014,0004Restored Mill
610.4167% stronger weather bonus8,50022,5004Restored Mill
712.5% stronger weather bonus11,50034,0005Restored Mill
814.5833% stronger weather bonus15,00049,0006Restored Mill
916.6667% stronger weather bonus19,00068,0007Restored Mill
1018.75% stronger weather bonus24,00092,0008Farm Windmill
1120.8333% stronger weather bonus30,000122,0008Farm Windmill
1222.9167% stronger weather bonus37,000159,0009Farm Windmill
1325% stronger weather bonus45,000204,00010Farm Windmill
1427.0833% stronger weather bonus54,000258,00011Farm Windmill
1529.1667% stronger weather bonus64,000322,00012Harvest Mill
1631.25% stronger weather bonus76,000398,00012Harvest Mill
1733.3333% stronger weather bonus90,000488,00013Harvest Mill
1835.4167% stronger weather bonus106,000594,00014Harvest Mill
1937.5% stronger weather bonus124,000718,00015Harvest Mill
2039.5833% stronger weather bonus145,000863,00016Estate Mill
2141.6667% stronger weather bonus169,0001,032,00016Estate Mill
2243.75% stronger weather bonus196,0001,228,00017Estate Mill
2345.8333% stronger weather bonus226,0001,454,00018Estate Mill
2447.9167% stronger weather bonus260,0001,714,00019Estate Mill
2550% stronger weather bonus300,0002,014,00020Grand Windmill

How bonuses combine

Building effects apply only to their named mechanic. Active companion effects combine with buildings under the game’s caps: late-penalty reduction 75%, weather-bonus strength increase 100%, fertilizer strength increase 50%, seed grow-time reduction 34%, and automation capacity 96 hours. These caps describe fully combined systems, not bonuses supplied by this building alone.