Cold weather in the temperate areas of central Mexico comes and goes throughout the winter months in a series of “numbered fronts” that bring icy gusts which may also cause early frosts for a few days at a time. Then it warms up for a while before the next numbered front makes its way down from the US—Mexico’s principal trading partner and supplier of cold fronts.
One practical result of this polar disorder is that the interior climates in Mexican homes are usually a day behind the frequently-changing outdoor weather; remaining warm when it’s actually near freezing out, and vice-versa.
It’s therefore not surprising occasionally to see people dressed for the North Pole on relatively mild days, or shivering in shirtsleeves on cold days.
The timing of the cold fronts is uncertain, but there’s almost always one in the week of November 20, which apart from being the anniversary of the start of the 1910-1917 Revolution, is when the tree-farms on the hilly fringes of Mexico City usually start selling Christmas trees that you can cut down yourself.
Evidence that it can get quite cold in the central highlands is to be found in supermarkets, which each year set out an array of portable electric heaters at the front of the store, clearly visible as you step-in from the chill. And early risers in the capital know how fridge-like the first Metro trains out of the shed can be on those nippy mornings, so it’s not unusual to see some particularly assertive commuter walking through the carriage slamming the windows shut—although this habit is less-frequent now as people prize fresh-air above warmth during the flu season.
Cold spells across Mexico’s central highlands can be felt anytime from late autumn through to early spring, although by mid-to-late February temperatures usually begin to rise appreciably, creating some windy days in March, as spring returns bringing back the warm days, and more light during the evening hours following the clocks change.
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