°C ↔ °F Converter
Convert between Celsius and Fahrenheit. Aviation METARs and TAFs report temperature in Celsius, while some US pilots are more familiar with Fahrenheit.
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Formula
°F = (°C × 9/5) + 32 °C = (°F − 32) × 5/9
Multiply Celsius by 9/5 then add 32 to get Fahrenheit. Subtract 32 from Fahrenheit then multiply by 5/9 to get Celsius.
Reference Table
| °C | °F | Aviation Context |
|---|---|---|
| -40 | -40 | C and F are equal at this point |
| 0 | 32 | Freezing level — icing risk begins |
| 15 | 59 | ISA sea-level standard temperature |
| 30 | 86 | Hot day — significant DA increase |
| 40 | 104 | Extreme heat — major performance reduction |
Aviation Context
Aviation uses Celsius for outside air temperature (OAT), which directly affects density altitude, true airspeed, and engine performance. The ISA standard temperature at sea level is 15°C (59°F), decreasing approximately 2°C per 1,000 ft. Temperatures above ISA increase density altitude and degrade aircraft performance.
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