Low cloud forced the cancellation of both Friday practice sessions at the Eifel Grand Prix.
The medical helicopter was unable to fly at the Nurburgring as a result of the conditions, which meant the cars could not run on safety grounds.
F1 rules dictate that the road journey to a suitable hospital must be no longer than 20 minutes, and the nearest medical facilities are 54km away.
The teams will now have one practice session on Saturday before qualifying.
The lack of running meant that Ferrari young drivers Mick Schumacher and Callum Ilott were unable to have their scheduled outings in the Alfa Romeo and Haas cars in the first session.
Ferrari team boss Mattia Binotto said that the pair may get another chance later in the season.
The pair are potential candidates for a seat in F1 next season with both Haas and Alfa Romeo yet to decide on their driver line-ups.
World champion Lewis Hamilton enters the weekend with a 44-point lead over team-mate Valtteri Bottas and has the chance to equal Michael Schumacher's all-time record of 91 Grand Prix victories on Sunday.
The world champion's Mercedes team have had two personnel test positive for coronavirus at the Grand Prix, with a further four isolating as close contacts.
Team boss Toto Wolff said: "It is not a good situation but I guess it is something that will follow us for quite a while.
"I think we have it under control from having back-up back in (the factory in) Brackley and in that respect we should be in control of the situation."
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