Apparent temperature is the temperature equivalent perceived by humans, caused by the combined effects of air temperature, relative humidity and wind speed. There are several ways of measuring it, personally I like the wet-bulb globe temperature as it combines the effects of radiation, humidity, temperature and wind speed on the perception of temperature. But there are other ways, such as heat index and wind chill factor.
Mars is very cold, with a mean temperature of −63 °C. But it's atmosphere is also very thin, at 0.00628 atm. This would strongly reduce the effects of wind chill but increase evaporation. But evaporation is easily countered with a suit.
So what would be the apparent temperature on Mars?