This report describes the typical weather at the Lic. Benito Juárez International Airport (Mexico City) weather station over the course of an average year. It is based on the historical records from 1990 to 2012. Earlier records are either unavailable or unreliable.
Mexico City has a mild temperate climate with dry winters and warm summers. The area within 25 mi of this station is covered by grasslands (31%), forests (27%), shrublands (25%), built-up areas (10%), and croplands (7%).
Over the course of a year, the temperature typically varies from 43°F to 81°F and is rarely below 37°F or above 86°F.
The warm season lasts from March 23 to June 11 with an average daily high temperature above 78°F. The hottest day of the year is April 29, with an average high of 81°F and low of 55°F.
The cold season lasts from November 10 to February 5 with an average daily high temperature below 72°F. The coldest day of the year is January 11, with an average low of 43°F and high of 71°F.
The length of the day varies significantly over the course of the year. The shortest day is December 21 with 10:58 hours of daylight; the longest day is June 20 with 13:19 hours of daylight.
The earliest sunrise is at 6:31am on March 31 and the latest sunset is at 8:19pm on July 6. The latest sunrise is at 7:36am on October 27 and the earliest sunset is at 5:56pm on November 27.
Daylight savings time (DST) is observed in this location during 2012, starting in the spring on April 1 and ending in the fall on October 28.
The median cloud cover ranges from 21% (mostly clear) to 88% (mostly cloudy). The sky is cloudiest on September 11 and clearest on December 29. The clearer part of the year begins around October 28. The cloudier part of the year begins around May 17.
On December 29, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 52% of the time, and overcast or mostly cloudy 18% of the time.
On September 11, the cloudiest day of the year, the sky is overcast, mostly cloudy, or partly cloudy 60% of the time, and clear or mostly clear 7% of the time.
The probability that precipitation will be observed at this location varies throughout the year. Precipitation is most likely around July 28, occurring in 75% of days. Precipitation is least likely around December 23, occurring in 7% of days.
Over the entire year, the most common forms of precipitation are thunderstorms, light rain, and moderate rain.
Thunderstorms are the most severe precipitation observed during 47% of those days with precipitation. They are most likely around July 16, when it is observed during 39% of all days.
Light rain is the most severe precipitation observed during 26% of those days with precipitation. It is most likely around August 27, when it is observed during 20% of all days.
Moderate rain is the most severe precipitation observed during 23% of those days with precipitation. It is most likely around July 30, when it is observed during 17% of all days.
During the warm season, which lasts from March 23 to June 11, there is a 42% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of thunderstorms (54% of days with precipitation have at worst thunderstorms), light rain (23%), and moderate rain (21%).
During the cold season, which lasts from November 10 to February 5, there is a 11% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of light rain (37% of days with precipitation have at worst light rain), moderate rain (29%), and thunderstorms (29%).
Either snow is exceptionally unlikely to fall at any time during the year at this location or this station does not reliably report precipitation types.
The relative humidity typically ranges from 18% (dry) to 87% (very humid) over the course of the year, rarely dropping below 11% (very dry), or exceeding 94% (very humid).
The air is driest around March 9, at which time the relative humidity drops below 22% (dry) three days out of four; it is most humid around September 4, exceeding 82% (humid) three days out of four.
Dew point is often a better measure of how comfortable a person will find the weather than relative humidity because it more directly relates to whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid.
Over the course of a year, the dew point typically varies from 27°F (dry) to 55°F (very comfortable) and is rarely below 15°F (dry) or above 58°F (comfortable).
The time of the year between May 29 and October 23 is the most comfortable, with dew points that are neither too dry nor too muggy.
Over the course of the year typical wind speeds vary from 0 mph to 20 mph (calm to fresh breeze), rarely exceeding 30 mph (strong breeze).
The highest average wind speed of 8 mph (gentle breeze) occurs around May 28, at which time the average daily maximum wind speed is 20 mph (fresh breeze).
The lowest average wind speed of 5 mph (light breeze) occurs around December 12, at which time the average daily maximum wind speed is 14 mph (moderate breeze).