OAT - Outside Air Temperature The Outside Air Temperature (OAT) is important to a pilot, especially when it is very cold. According to the AOPA's Air Safety Foundation's Safety Advisor (Weather No. 2)...
Icing is most likely to occur when:
• The outside air temperature (OAT) is between 0ºC and -20ºC, but the worst icing will usually occur between 0ºC and -10ºC.
• If the temperature dew point spread is fewer than 2ºC and the temperatures are between 0ºC and -20ºC be especially vigilant for ice.
• The worst icing is common in the top 1,000 feet of cumulus clouds when the temperature is 0ºC or lower.
• Keep a sharp eye on the OAT gauge and if visible moisture (clouds) is encountered when the OAT is between these temperatures, be prepared to change altitude if ice begins to accumulate.
...Many aircraft I have flown in has no OAT Gauge...
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