Tropical species

80°F to 100°F (27°C to 38°C)

Temperate species

68°F to 95°F (27°C to 38°C)

Semiaquatic turtles

Slightly lower range

Humidity

All species

Varies by species; in general, humidity levels below 35% or above 70% may cause problems (depending on species)

Photoperiod

Subtropical and tropical species

10 hours (winter) to 14 hours (summer)

Temperate species

8 hours (winter) to 16 hours (summer)

Light

All species

Ultraviolet (UV) and UVB: 290 to 320 nanometers

Basking light: 50 to 75 watts at least 18 inches from basking area