In a fog: It's not just the far north that has been experiencing a cold snap during the past week. New Delhi, notoriously hot in the summertime, has been enshrouded with fog as temperatures have fallen, with low temperatures between 5 and 9 degrees Celsius (41 and 50 degrees Fahrenheit). That's hardly cold at all by the standards of more northern climes, but that doesn't mean the unusual weather hasn't wreaked havoc. Numerous flights have been delayed due to the fog, and the poor visibility has led to train cancellations, stranding tens of thousands. Above, tourists visit the fog-enshrouded India Gate monument in New Delhi on Jan 2.