Cold and Icing Conditions Testing

[leonard17F]

Hi All !

If you had to perform Extreme Cold and Icing Conditions Testing for a biz-jet:
- In the Northern hemishpere:
when would be the latest/warmest possible period in winter ? March, April
when would be the earliest possible period in late autumn or winter ? November, December ?
where would you go ? Iqualuit, Resolute, Narsasuaq, etc..or....Siberia, Alaska ?
- Are there suitable locations in the Southern Hemisphere ?

Thanks a lot for your inputs !