Chicago has been having some fairly remarkable weather lately, even by their standards. On the 25th of January there was more than an inch of snowfall recorded for the first time in 335 days, a new record. Then a surge of warm air from the south brought a temperature of 63 degrees at O'Hare airport on January 29th, a new record for that date, exactly one week after a temperature of 9 degrees was recorded (which, combined with the 35mph winds on that date, produced a windchill factor of about -20f). The current forecast (at time of posting this) calls for a high of only 14f on Friday (Feb. 1st), another significant temperature swing within a few days.
Infographics that give a little insight into the history of public transport(ation) in the UK.