In northeast Greenland in April you can experience all manner of arctic winter conditions and as Iceman Polar race competitors, you must be suitably experienced and equipped to deal with such conditions.
Conditions can vary from perfectly calm days with clear skies and daytime temperatures rising to -5°C to extreme blizzards and whiteout conditions with night time temperatures of -30°C (not accounting for further wind chill). Average day and night time temperatures are around -15°C to -20°C. Several hours dusk/darkness will be experienced between the hours of approximately 10pm and 6am.
Camping will be in full Arctic winter conditions throughout the race and weather in Greenland can change rapidly. Tents should always be pitched and secured in a safe manner as if an extreme storm was expected at any time. Strong and sufficiently high snow walls should be built to protect camp sites from the effects of storm-force winds, taking into account possible wind direction changes.