Lewis Hamilton feels he and his rivals will head into qualifying "blind" on Saturday after a practice day around a "violent" Monaco from which little was gleaned.
Showers in second practice on Thursday threw a spanner in the works for most of the drivers and teams looking to get to grips with the streets of the principality.
More importantly, in a season when tyres are crucial, and with Pirelli introducing their supersoft rubber for the first time this weekend, the rain scuppered the learning process.
Only Hamilton's McLaren team-mate Jenson Button managed a quick lap on the supersoft tyre, naturally topping the timesheet, before the showers intervened.
It means the 24 drivers now have just one final hour of practice prior to qualifying to understand the vagaries of a tyre they have not yet been used to this season.
Asked what he had learned from the day, an honest Hamilton said: "Not much to be honest.
"It was a difficult day in terms of trying to dial in the car because of the conditions changing and there was also a lot of traffic out there.
"It was still incredible driving this track. I saw some on-board footage of a Red Bull, and I hope people saw how violent it is in the car. It is so bumpy, but it is so much fun.
"The problem is the less running you do then the tougher it is to understand the tyres, and no one managed to do a long run.
"They might do one in FP3, but I doubt it, so everyone will be going into the race blind in terms of how the tyres behave.
"I'm sure it will be a big surprise for everyone. We're all in the same boat, so it will be fun that's for sure."
Hamilton admits it will boil down to making the most of a limited opportunity on the day.
The 27-year-old added: "I'm sure the same teams will be quick this weekend, and everyone has the chance to fight for the front end of the grid.
"It will be about making sure you get out there at the right time, that you get the temperature into your tyres and brakes and you nail it on the lap you get."
Ferrari's Fernando Alonso was left flustered by the weather that was neither here nor there as the rain was only light at times, making the track even more unpredictable than usual.
"For we drivers, Thursday in Monaco provides the best opportunity to reacquaint ourselves with a very unique track," said Alonso, currently leading the drivers' championship alongside reigning world champion Sebastian Vettel.
"The more you go round, the more you gain confidence and the harder you can push to bring the lap time down.
"In the morning we were able to get through our planned programme without any trouble, but in the afternoon the rain came to spoil our plans and those of the others too.
"We weren't able to even fit the supersoft, and only Button was able to find the right window to make the most of that tyre.
"But it's not as though we understood much more when on the intermediate tyres given he track was only damp in places.
"It wasn't very representative, but we can't control the weather, we can only adapt to it as it changes."