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David_Gerard comments on Insufficiently Awesome - Less Wrong Discussion
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Two or three minutes under cold (or at least colder) is an awesome morning wakeup IME. You can run hot afterwards if you like.
Seriously, you[1] are not going to induce hypothermia in five or ten minutes of cold water. That's just silly. Hypothermia is not a significant risk of ten minutes' swimming in a non-heated pool, for example.
(If you're doing the New Year's Day Alcatraz Swim, of course, you may care to make sure you're warmed properly afterwards.)
[1] in the general case
The effect is probably mostly Mammalian diving reflex, which is triggered by colder-than-21°C water contacting the face, with other factors (such as showering your whole body) much less relevant.
Seems to have a lot more effect when it's a shower, not just cold water on my face.