Ahead of today's opening practice session, the air temperature is 21 degrees C and the track temperature is 22 degrees. It is overcast and unseasonably cool.
Tyre options this weekend are the same as in Monaco - soft and supersoft - though it is highly unlikely that we will see the same sort of pit strategy on Sunday.
Not for the first time, the weather look likely to play a part in this weekend's proceedings, and while this morning's session is likely to be dry, rain is forecast for this afternoon and much of the rest of the weekend.
All twenty-four drivers are on duty this morning, no reserve or test drivers called into action.
With the FIA having clarified the rules regarding the holes in the floor of the Red Bull, the Milton Keynes has made the necessary modifications.
The lights go green and Vergne leads the way, followed by Kovalainen, Ricciardo, Raikkonen, Grosjean, Karthikeyan, Kobayashi, Hamilton and Webber.
Some rank stupidity from Pic who appears to be racing Alonso, the Spaniard, quite rightly, clearly frustrated by the Frenchman's silliness. Both Ferraris are absolutely plastered in flo-vis paint. Both Red Bulls, on the other hand, are sporting some very odd looking sensoring devices.
Ten minutes into the session, after several minutes of total inactivity, both Lotus are back on track. As is Perez.
Grosjean posts 1:20.295 and Raikkonen 20.347, while Perez can only manage a 25.205 on his first timed lap.
Next time around Raikkonen ups the ante with an 18.703 while Perez, who didn't race here last year, posts 21.773.
With an eye on the clouds more and more drivers take to the track. Vergne goes third (20.770), ahead of Perez and Kobayashi while Button pits following a second installation lap.
A 17.386 sees Grosjean retake the top spot only to be eclipsed by his teammate's 17.188 moment later. Rosberg goes sixth and Alonso ninth. Elsewhere, having already cut the final chicane, Senna goes cross-country at Turn 9.
Rosberg goes quickest with a 16.837 and teammate Schumacher ninth (19.454).
Twenty-five minutes into the session, with 17 names on the timesheets, di Resta complains of moisture on his visor. As cars continue to miss the final chicane, the first few drops of rain are reported.
Having gone second (17.035), Hamilton goes quickest in S1 and S2 on his next lap, finally crossing the line at 16.080 to go quickest.
Schumacher improves to fourth and Massa fifth, as Kovalainen is another driver enjoying a spot of cross-country. Massa subsequently posts a 16.619 to go third.
Webber's first flying lap sees the Australian go nineteenth (20.314), as Pic, Button, Glock and Vettel remain the only drivers yet to post a time.
As Webber improves to twelfth (17.671), teammate Vettel posts a 21.169 to go twentieth.
Sporting an impressive new rear wing, Maldonado goes tenth with a 17.180.
Replay shows a fox lucky not to be hit by a Lotus as it runs across the track.
Vettel improves to fourth as teammate Webber goes quickest in S1. The Monaco winner subsequently posts a 16.347 to go third.
As Perez almost hits the wall at the final chicane, Senna outbrakes himself at Turn 3 and end up stuck in the escape road for a while before being able to recover.
Mercedes looking good as Schumacher goes third (16.310).
At half-time, it's: Hamilton, Rosberg, Schumacher, Webber, Vettel, Kobayashi, Massa, Perez, Button and Grosjean. All but Glock have posted times.
As Senna takes to the escape road again he is told (quite firmly) not to use his DRS as it is working intermittently.
It's all over for Kovalainen, the Finn having wiped off the right-hand side of his Caterham at Turn 9. As he climbs from the car the session is red-flagged. Replay shows the Finn begin to lose it as he exits the corner, and though he tried to save the day once he runs over the kerbs its game over.
The stewards announce that the session will resume at 11:02 (local time) after a red flap period of around thirteen minutes.
When the lights go green, Alonso is one of the first back on track. Interestingly, both Lotus now on the supersoft rubber.
Drivers continue to cut the final chicane, Vettel no exception.
Karthikeyan, in an HRT with a new very small rear wing, is the only other driver on the option rubber. The Indian improves to twenty-second with a 20.258. Elsewhere, Hamilton gets it all wrong at Turn 2.
Rosberg improves with a 15.782 to go quickest, while Kobayashi and de la Rosa are quickest through the speedtrap.
Hamilton, like Rosberg on the prime rubber, retakes the top spot with a 15.564. Vettel posts 16.143 to go third, ahead of Schumacher, Webber and Button.
Alonso posts PBs in the first two sectors but a huge lock up at the hairpin means he fails to improve. However, he subsequently goes third with a 15.842 having gone quickest in S1.
In the McLaren garage mechanics are swarming over Button's car, the Englishman having only completed 12 laps thus far.
A 16.000 sees Kobayashi go fourth a squirrel is spotted in the middle of the track. Hesitating as to which direction to take, the sight of Raikkonen bearing down on him is enough to make the little critter head for the safety barrier. Do squirrels have nine lives?
Stewards announce that they are to investigate an incident at the final chicane involving Vettel and Senna.
With 7:00 on the clock, Rosberg and Schumacher switch to the softer rubber. Webber and Vettel also.
Hulkenberg (option) goes sixth (16.146) having posted PBs in all three sectors.
Vettel and Webber both post PBs in the first two sectors, however, while the Australian improves to fourth (15.897), his German teammate backs off in order to give himself some clear air. Next time around the world champion posts 15.801 to go third.
A 15.682 sees Vettel improve to second, however, a poor final sector on his next lap means he fails to end the session quickest.
The session ends with Hamilton quickest, ahead of Vettel, Rosberg, Alonso, Webber, Hulkenberg, Kobayashi, Perez, Schumacher and Button.
Di Resta is eleventh, ahead of Massa, Maldonado, Grosjean, Raikkonen, Vergne, Ricciardo, Petrov, Kovalainen, de la Rosa, Senna, Karthikeyan, Glock and Pic.
Check out our Friday gallery, here.