@Torvi I have (after reading previous posts) been updating the weather data in my database, I only have it fully back to the star of this year, but avg temps going way back to Aug 2012, when the temps drop below 0 and with wind chill it is bitter, its not so much on the bike, but actually getting out I am not bothered about temps so much got enough kit to keep warm, but ice and snow, whilst I have done it, its not something I will be doing much of in the future, wind, rain thunder lightening, don't phase but ice, it doesn't matter what your riding on tyre wise (don't pipe up about ice tyres I know) ice will take you out, snow isn't so bad till its compacted.
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Anyway the coldest I rode in that I know of was -5.5C then add wind chill of the speed your doing it starts to feel like -10C, not trying to put you off like, as i will be riding rather than a turbo.