I have been out and measured mine this afternoon - in the Cornish rain. All part of improving my planning and not wasting seeds/plants etc. I have 4 veg beds giving a total of 129.4 sq ft - sorry I haven't gone metric yet.
Each individual bed ranges in size from 27.5 sq ft to 37.25 sq ft. This is purely for veg - I have a separate area for fruit which is a bit chaotic at the moment and is planned to be re-organised and netted.On top of the 'bed' space, I will be growing early potatoes in pots, and things like tomatoes and aubergines will be in pots. I also plan to extend a smallish bit to go under a cloche for salads.
I am just growing for 2 of us, and replanned and extended the area late last year, repositioning and rebuilding my beds. My seed potatoes are now in and ready for collection along with a load of new seeds. Beginning to itch - but my 'plot' is currently under a couple of inches of rain.
As our lease is up in a year or two and we'll have to move out, there's not a lot of point in putting much more effort into expanding.
I always find planning a fun thing to do. I have kept some records over the last couple of years, but they are not consistent. I do have a ring binder in which I store information - like recommended varieties and growing tips. It sounds a good idea to record weather and wildlife - we'll all certainly have some weather to record already for 2009.