Greenhouse Temperature Calculator
Estimate the inside temperature of a greenhouse based on outside temperature, sun exposure, and ventilation.
Estimated Greenhouse Temperature
Greenhouse interior temperature depends on outside temperature, solar gain, and ventilation.
A greenhouse typically raises interior temperature by 20-30°F (11-17°C) above outside temperature in full sun with no ventilation.
Temperature gain factors:
- Full sun, no ventilation: +25-30°F (+14-17°C)
- Full sun, passive vents: +15-20°F (+8-11°C)
- Full sun, active fan ventilation: +8-12°F (+4-7°C)
- Partial sun: Reduce gain by 40-50%
- Overcast: Reduce gain by 70-80%
Ideal greenhouse temperatures:
- Cool-season crops: 50-70°F (10-21°C)
- Warm-season crops: 65-85°F (18-29°C)
- Tropical plants: 70-90°F (21-32°C)
- Most plants stress above: 95°F (35°C)
Ventilation tips:
- Open vents when interior exceeds 80°F (27°C)
- Fans should exchange air volume every 1-2 minutes
- Shade cloth reduces gain by 30-50%