Calculate your minima and holdover times

Cold temperature corrections for instrument approaches have always been a headache for pilots, especially under pressure. Enter the airport elevation and temperature and get your corrected altitudes instantly. It also gives you holdover times for de/anti-icing, with a holdover timer that stays on your lock screen.

Altitude Corrections tab with airport elevation, reported temperature, MDA/DA, FAP/FAF and missed approach holding altitudes, the corrected altitudes and a correction table
Holdover Times tab showing a 0:20 to 0:40 holdover time for generic Type II fluid at 100/0 in light snow at -5 °C, with buttons to start the holdover timer
Running holdover timer counting down to the longest holdover time, with the time when the shortest holdover time ends and a Stop timer button
Lock screen Live Activity showing the longest and minimum holdover time countdowns with Reset and Stop buttons

Key Features

Altitude corrections

  • Corrected altitudes: Enter airport elevation, reported temperature and MDA/DA, and the corrected altitude is calculated as you type
  • More altitudes: Optional FAP/FAF and missed approach holding altitudes, plus as many extra altitudes as you need
  • Correction table: A table of corrections and corrected altitudes for your approach
  • ICAO table: Based on the ICAO cold temperature error table (200–5000 ft) with interpolation between values
  • Units: Feet or meters, Celsius or Fahrenheit

Holdover times

  • FAA holdover tables: Holdover times from the FAA Holdover Time Guidelines, winter 2026–2027
  • All fluid types: Type I, II, III and IV, generic times or a specific fluid brand, and fluid/water concentration
  • Conditions: Outside air temperature and precipitation, including frost, freezing fog, snow, freezing drizzle and freezing rain
  • Snowfall intensity helper: Find the snowfall intensity from the prevailing visibility
  • Adjusted times: FAA adjusted tables for flaps/slats deployed before de/anti-icing
  • Full tables and notes: Open the full holdover table and the notes that apply
  • Updated data: The app checks for new holdover data editions when it starts

Holdover timer

  • Start now or earlier: Start the timer when the final anti-icing step begins, or from an earlier time
  • Notifications: Alerts when the shortest time is reached, 5 minutes before the longest time ends, and when it expires
  • Live Activity: Countdown on the lock screen and in the Dynamic Island, with Stop and Reset buttons

Perfect For

  • Pilots: Correct approach altitudes and check holdover times before departure
  • Flight Instructors: Teach cold weather and de/anti-icing procedures
  • Aviation Students: Learn cold temperature corrections and holdover tables

Disclaimer

The app is intended for guidance only. Holdover times are estimates for departure planning and do not replace the pre-takeoff check, your operator’s procedures or the official FAA document. Always consult official resources and information.

Download

Cold Temperature Operations is a paid app for iPhone and iPad with no in-app purchases.

Download Cold Temperature Operations on App Store

Cold Temperature Operations - Safety in cold weather.