Hi Craigu,
There have been a lot of sound replies above and you seem to be heeding the warnings, I'd just like to add a few comments which may be of interest.
Winter winds are definitely kiteable when you have the experience. Gaining the experience takes time to develop your understanding of the feel sight and sound of what's normal and what's not. Often you see things which, without experience don't ring alarm bells when they should. Looking to see what kites others are on is not necessarily accurate. Some very experienced kiters can hold very large kites down in extreme winds. Look at Ruben Lenton on his 9m in 40 knots for the most obvious example.
Westerly winds although steadier than frontal winds are not only difficult to get off the beach as a beginner, but also tend to make the ocean extraordinarily choppy. Anyone who has kited Pinnaroo in a strong Westerly will attest to the pounding of the knees in the chop and that getting a small patch of water to load up for a jump is almost impossible. On days like this it is actually more fun not to kite.

Frontal winds are so unpredictable even when you know what you are looking at, that as a beginner with little experience you barely stand a chance. The unpredictability and gustiness of the wind make the kite fly very erratically and will most likely leave you wondering if your lines are trimmed right or that it may be something you're doing wrong. At the early stages of learning, this doesn't progress your kiting and can in fact set you back a bit.
A better bet is to grab a trainer kite if you have one and spend the time flying it to death. It will ingrain into your body the feel and sight of how it all works, if you are getting on the board, grab a skateboard and head to an empty car park by the ocean and practice controlling the kite as you roll along. You can practice going upwind, downwind, cross wind and managing gusts. It's not exactly the same in terms of the board, but the kite side is identical.
DO NOT USE your inflatable kite for land practice as you will destroy it.
Bottom line is, don't rush it, accident potential goes through the roof learning kiting in winter. Instead, watch You Tube video's, watch the Progression DVD's, fly a trainer kite, hang out with other kiters and watch what's going on. When the wind comes back in September/October you'll be miles ahead and ready to smash out a serious progression session with knowledge and some skills.
A Winter on crutches wont help your kite progression.

DM