It's freezing cold - keep the window open, please!

Never mind icy roads, cancelled buses and the temporary closure of Heathrow, you know the weather's bad when the Premier League petitions to extend the January transfer window on account of the snow.

Even now, at 9am the following day - 16 hours after the deadline - we do not know for sure who has moved where.

Who are the big winners and losers?

The biggest question mark hangs over my team, Arsenal, who at the time of writing are still unable to confirm the signing of Russian playmaker Andrei Arshavin. We are told the clubs have agreed a fee, and the player has passed his medical and agreed personal terms, but Zenit St Petersburg are still holding out for a payment from the player for terminating his contract with them. The deal will surely go through, as any delay which defers a prospective transfer until the summer will benefit no one, but I'm not counting my chickens. There's many a slip, and all that.

For Arsenal's North London rivals, Tottenham, it has been a bit of a mixed bag. Jermain Defoe returned from a year's sabbatical at Portsmouth, but at an increased cost. Robbie Keane spent half that time at Liverpool, but Spurs have made a profit of around £8m on the transaction. Pascal Chimbonda was willingly and hastily soldback by Sunderland. And the error-prone Heurelho Gomes has been unceremoniosuly dropped in favour of ex-Chelsea keeper Carlo Cudicini. The net result? God only knows. However, I can confirm that the rumours of Harry Redknapp making enquiries for former Spurs players Teddy Sheringham, Glenn Hoddle and Ozzie Ardiles proved unfounded.

United, Chelsea and Liverpool were relatively quiet on the transfer front - Keane and Cudicini left Anfield and Stamford Bridge, Ricardo Quaresma arrived at Chelsea on loan. Aston Villa signed Emile Heskey - a good bit of business, that - while Everton brought in Jo on loan from Manchester City, affording David Moyes the luxury of being able to field one fit striker for a change.

Ah, City. Despite a succession of solid signings - Wayne Bridge, Craig Bellamy, Nigel de Jong and Shay Given - which will significantly strengthen the squad, they are widely seen as something of a laughing stock after the public way in which they made AC Milan an offer they couldn't possibly refuse for Kaka ... only to see it firmly rejected by the player. Add to that a list of reported failures to bring other superstar players - Buffon, Villa, Henry, Terry - to 'Middle Eastlands' which is as long as your arm, and it's difficult to resist the temptation to mutter the word schadenfreude repeatedly under your breath.

The other big losers in the transfer window appear to be Portsmouth and West Ham.

Strapped for cash and facing a tough relegation battle, Portsmouth have lost their best goalscorer (Defoe), their best midfielder (Lassana Diarra) ... and signed Hayden Mullins (from West Ham) and Angelos Basinas, the Greek former European Championship winner, who has only ever played for one small club - Mallorca - outside his home country, and who, at 33, is unlikely to be able to boss midfield in the way Diarra could.

West Ham's league position is less precarious, although the club remains up for sale. They have needed to trim both their squad and their wage bill for some time, so the sale of Bellamy, Mullins and Nigel Quashie, and loan deals for Calum Davenport and Julien Faubert, came as little surprise. However, their signing of Savio Nsereko, a 19-year old German striker who has scored just three goals for Brescia in Italy's Serie B, for a fee estimated somewhere north of £8m, must fall firmly into the 'unproven and potentially costly punt' category.

Anyhow, with the possible exception of Arshavin, it seems unlikely we will see any other big moves before the window opens again in the summer. At which point the mad scramble to unearth little-known gems and to pay excessive amounts for mediocre players will start all over again.

Wonderful. Now will someone please keep the window firmly shut - it's snowing outside again.