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The answer is New Delhi. 3 times occurrence in 40 years, only once in Hong Kong.
Also keep in mind that NOBODY has heated homes there and poor are all out exposed. That's what makes even minor cold unbearable for folks shown in the article below. For some reason, several people die whenever cold weather hits India :
Well, innocent lives are still taken. People don't deserve to die for the simple fact that they cant afford warmth. Kill all those rapists and murderers on sight instead of housing them with taxpayer money sucked away from others. That's a way to reduce the population.
Back to topic, since new Dehli has the lowest record lows and moisture is common with the chill, it has the greatest chance of flurries.
I'm going to disagree with most people on here and vote for Calama. It seems like the obvious choice. It has the coldest average lows of the three. The dryness is inconsequential since all we need is one snowflake to satisfy the requirement. New Delhi cannot experience both cold and cloudy weather at the same time - it needs clear skies to cool to below freezing. Hong Kong has too much maritime influence. On the other hand, I can easily envision a cloudy night in Calama getting down to near the freezing point.
I agree with you and I do think climate patterns in the Central Andes are poorly known in general. Lows from the Pacific Ocean sporadically go at lower latitudes than the usual and hit that region generating widespread snowfalls in the mountains; sometimes they reach the inhabitated valleys.
As far as I know, snow in Calama has been reported a few times (i.e. 1976, 1997, 2002, etc.), the last one having occured as recent as at August 24, 2013. It is usually some isolated flurries, although important accumulation is not uncommon in the area, especially over 3000 metres above sea level.
P.S.: According to climatologist Max Herrera, New Delhi has never experienced snow.
Calama. It actually has night time lows below freezing on average for a couple months a year. That's Tennessee-level average winter lows. Plus average lows of 41 F / 5 C even in summer. Snow in Calama in summer is probably as likely as it is in winter, with summer precipitation being so much higher (up to 17 mm/month vs 1-2 mm/month)
That's the answer then. If it's high elevation, the low temperatures don't need to be associated with clear skies, they'll be from the ambient air rather than radiational cooling. Precipitation averages are tiny, but as said, all you need is one snowflake.
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