I can scarcely believe it but, as I write, it's snowing again. This is the third big dump in a week and means, of course, all those poor sods who work for the BBC's news programmes will be putting on their horrible anoraks and making their way to various gritting depots to provide live coverage of how Britain is locked in what the Daily Mail calls "ice chaos".
This means that tonight, yet again, I shall be watching Robert Hall, in his 1980s skiing clobber, standing up to his testes in a drift, telling me not to go out unless it's a matter of life and death and that if it is a matter of life and death I should take a shovel, some soup, a blanket and, for reasons that are not clear, a high-visibility jacket.
He will then lavish praise on the snowplough drivers for their round-the-clock public-spiritedness and, in turn, round on their bosses for not seeing the big freeze coming. I will then throw something at the television.
When it snowed in the olden days, everyone had snowball fights and a sense of delicious anarchy descended on the land. Not any more. Now, someone is to blame.
This, of course, is a problem for the BBC's news programmes because normally when something goes wrong they point the finger at global warming. But for obvious reasons that won't wash this time around so they've decided it's all the fault of the council gritting departments.
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If you think about it, that doesn't wash either because we keep being told by the government and the BBC that thanks to climate change there will be no more snowy winters. So why bother stocking up with salt and grit for something that won't happen again?
In fact, the real reason the country grinds to a halt whenever there's a nip in the air is that everyone has lost the ability to drive a motor vehicle. You must have noticed. In dodgy conditions you are the only person who drives at the correct speed. Everyone else goes either far too slow or far too fast.
Last week I was driving home from Oxford - in a T-shirt to annoy Robert Hall - and I simply couldn't believe it. I realise that in these parts the council grits only the bus and cycle lanes but the A44 wasn't too bad. And yet everyone was doing 10mph. I'm not exaggerating for effect. They were doing 10. I could have gone faster on my hands and knees.
The fact is this. A car, left to its own devices, will travel in the direction you've pointed it. It will not suddenly veer into a ditch unless you do something sudden with the steering or the brakes.
If you are gentle; if you plan ahead - and this is possible because your car has windows and headlamps - you will see a corner coming and ease off the throttle to slow down a bit. All will be well.
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Unless, of course, you are travelling on black ice, in which case you are at the mercy of gravity and witchcraft. But on the A44 that night there was no ice of any kind. I knew this because I have ears on the side of my head, through which I could hear water sploshing off the tyres. I could hear it even above the sound of Sally Traffic telling me to stay at home unless my head had actually fallen off.
And then I was overtaken by a smug-looking businessman in a BMW X5. Because he had bought a large 4x4, he imagined that somehow he was immune to the laws of physics and that the tyres fitted to his car were made from some kind of snow-resistant Velcro. Imagine, then, my sense of joy when I rounded the corner outside Enstone to find him in a hedge.
A similar misfortune befell a friend of mine who had got it into his head that somehow a Volvo XC90 is not subject to vagaries in the road surface and drove down a road covered in sheet ice, into a tree. As I arrived on the scene, it was very hard to arrange my face into something that showed concern, not helpless mirth.
A four-wheel-drive car, provided it is fitted with off-road tyres, will get you out of a snowy driveway and, slowly, up a snowy hill. But momentum is more than a match for a centre differential. So at all other times it is just as likely to crash as your grandad's Peugeot.
That said, because I live 850ft above sea level in a county whose officials believe grit and pebbles are what poor people put on their houses, I have driven my Range Rover for the past two weeks. This is because it's the only car capable of getting out of my drive and into town.
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Mind you, it's not capable of getting much farther because some Midlands numpty put the windscreen-washer bottle right at the front of the car in the air flow. So, about a mile after you set off, it becomes an ice cube and my windscreen becomes as see-through as cardboard.
I have, though, enjoyed stopping and offering lifts to the sorts of local people who normally loathe 4x4s. And been very amused by one pinch-faced old rambler who declined. "No, thanks. I'm enjoying the exercise," she said, as she fell flat on her face.
The snow here is really deep. Peak District deep. Aviemore deep. I've just measured it with a tape measure and outside my office door there's a drift that is 61cm from crust to gravel. That's Canada deep. I'm thinking of ringing Robert Hall to see if he wants to deliver his next breaking news report while standing in it.
In places, there are little snowy hillocks that appear to be even deeper, but underneath each is a press demonstrator car that was delivered before Christmas and is still here, entombed in its own moulded igloo. There's a Renault out there somewhere, and a Golf and a Mercedes E-class estate, and then there's the subject of this morning's missive - a Porsche 911 Turbo.
You need to be paying constant attention to stay abreast of the 911 range, which, in essence, is one car offered in countless subtly different ways. Do you know the difference between a 997 and a 996? Or a Carrera and a Carrera S? Or a GT2 and a GT3? I do but I can't be bothered to explain everything here.
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And anyway there's no need because the Turbo buried in my drive is a convertible, and that, like all drop-top Porsche 911s, is unwise.
I can explain this. Each 911 is slightly different. Each is tailored to suit a slightly different driving style and locale. But fundamentally each is designed to be better to drive than anything else for the money.
Now. If you take the roof off a car designed to be a coupé, some of the structural rigidity will be lost. To compensate, extra strengthening is required, which makes the whole car heavier. This affects how the car feels, and since the whole point of a 911 is the "feel", the point is lost. This is a fact.
A fact that isn't true any more. A Ferrari F430 Spider is just as fast and feelsome round a track as the berlinetta. And so it goes with the 911. Supercar engineers can now make a heavier, less rigid convertible just as much fun to drive as its coupé sister.
But no one knows this. So if you drive a 911 Turbo convertible, everyone will laugh at you and say that you are a poseur and that you are having a midlife crisis. The time will therefore come when you pray for snowfalls to bury the embarrassment that you have brought upon yourself.
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Weeks ago, when the Turbo arrived, I began to enjoy it. I thought it might be the first arse-engined Hitler-mobile that I might consider buying. But then, after a mile, the snow came, and despite the four-wheel-drive system, that was that.
I suspect there's a very good car out there. But the reason it's a very good car is, I'm afraid, buried under a ton of prejudice and three feet of snow.
Porsche 911 Turbo cabriolet
Clarkson's verdict
Engine: 3800cc, six cylinders
Power: 493bhp @ 6000rpm
Torque: 479 lb ft @ 1950rpm
Transmission: Six-speed manual
Acceleration: 0-62mph: 3.7sec
Top speed: 193mph
Fuel/co2: 24.1mpg / 275g/km
Price: £113,467
Road tax band: M (405 for a year)
On sale: Now