Operating Temperature Limitations

[Gordy]

These are all I fly, hence all I have access to.

Bell UH-1H:

Temperature Limitation (Hub Spring Aircraft Only). Remove elastomeric springs prior to operating aircraft when OAT is below -20° C (-5°F) or If this temperature is anticipated to occur during flight. If, however, sub -20°C temperatures are encountered during flight change altitude in an attempt to find warmer air Elastomeric springs shall be reinstalled when the OAT is expected to stay above -20°C or the threat of sub 20°'C temperatures no longer exists.

Bell 205:

AMBIENT AIR TEMPERATURE LIMITATIONS
The maximum sea level ambient air temperature for approved operations is +530C, (+127°F) and decreases with altitude at the standard (2.01C/1000 feet) lapse rate. (See Ambient Air Temperature Limit Chart.)
The minimum ambient temperature for approved operations is -54°C (-65°F) for any altitude.
Engine de-icing shall be turned ON for flight in visible moisture at temperatures below +4.4°C (+40°F).
The maximum ambient temperature for use of engine de-icing is +4.4°C (+40°F).

Bell 206L4:

Maximum sea level ambient air temperature for operation is 51.7°C (125°F) and decreases with HP at standard lapse rate of 2°C (3.6°F) per 1000 feet.
Minimum ambient air temperature for operation at all altitudes is -50°C (-54°F).
Maximum ambient temperature for use of engine anti-ice is 5°C (40°F).
ENGINE ANTI-ICING and PITOT HEAT shall be ON in visible moisture when OAT is below +5°C (40°F).
Fuel control heater valve (if installed) shall be ON in ambient temperatures below 10°C (50°F). When operating in ambient temperatures above 21°C (70°F), fuel control heater valve shall be OFF.

Bell 212:

Maximum sea level ambient air temperature for operation is +52°C (+125°F) and decreases with altitude at standard lapse rate (2°C per 1000 feet HP ) . Minimum ambient air temperature at all altitudes is -54°C (-65°F). Refer to Weight-Altitude-Temperature Limitat ions for Takeoff , Landing, and In-Ground Effect Maneuvers Chart (Figure 1-1).