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.
← Scroll sideways to see every column →
| Level | Benefit | Cost to reach (coins) | Cumulative coins | Farm level | Appearance |
|---|---|---|---|---|---|
| 1 | 0% stronger weather bonus | 0 | 0 | 1 | Country Mill |
| 2 | 2.0833% stronger weather bonus | 1,500 | 1,500 | 1 | Country Mill |
| 3 | 4.1667% stronger weather bonus | 2,500 | 4,000 | 2 | Country Mill |
| 4 | 6.25% stronger weather bonus | 4,000 | 8,000 | 3 | Country Mill |
| 5 | 8.3333% stronger weather bonus | 6,000 | 14,000 | 4 | Restored Mill |
| 6 | 10.4167% stronger weather bonus | 8,500 | 22,500 | 4 | Restored Mill |
| 7 | 12.5% stronger weather bonus | 11,500 | 34,000 | 5 | Restored Mill |
| 8 | 14.5833% stronger weather bonus | 15,000 | 49,000 | 6 | Restored Mill |
| 9 | 16.6667% stronger weather bonus | 19,000 | 68,000 | 7 | Restored Mill |
| 10 | 18.75% stronger weather bonus | 24,000 | 92,000 | 8 | Farm Windmill |
| 11 | 20.8333% stronger weather bonus | 30,000 | 122,000 | 8 | Farm Windmill |
| 12 | 22.9167% stronger weather bonus | 37,000 | 159,000 | 9 | Farm Windmill |
| 13 | 25% stronger weather bonus | 45,000 | 204,000 | 10 | Farm Windmill |
| 14 | 27.0833% stronger weather bonus | 54,000 | 258,000 | 11 | Farm Windmill |
| 15 | 29.1667% stronger weather bonus | 64,000 | 322,000 | 12 | Harvest Mill |
| 16 | 31.25% stronger weather bonus | 76,000 | 398,000 | 12 | Harvest Mill |
| 17 | 33.3333% stronger weather bonus | 90,000 | 488,000 | 13 | Harvest Mill |
| 18 | 35.4167% stronger weather bonus | 106,000 | 594,000 | 14 | Harvest Mill |
| 19 | 37.5% stronger weather bonus | 124,000 | 718,000 | 15 | Harvest Mill |
| 20 | 39.5833% stronger weather bonus | 145,000 | 863,000 | 16 | Estate Mill |
| 21 | 41.6667% stronger weather bonus | 169,000 | 1,032,000 | 16 | Estate Mill |
| 22 | 43.75% stronger weather bonus | 196,000 | 1,228,000 | 17 | Estate Mill |
| 23 | 45.8333% stronger weather bonus | 226,000 | 1,454,000 | 18 | Estate Mill |
| 24 | 47.9167% stronger weather bonus | 260,000 | 1,714,000 | 19 | Estate Mill |
| 25 | 50% stronger weather bonus | 300,000 | 2,014,000 | 20 | Grand 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.