Average Weather in Monterrey Mexico
In Monterrey, the summers are long, hot, and muggy; the winters are short, cool, and dry; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 49°F to 95°F and is rarely below 40°F or above 100°F.
The hot season lasts for 4.3 months, from May 2 to September 11, with an average daily high temperature above 90°F. The hottest day of the year is July 29, with an average high of 95°F and low of 74°F.
The cool season lasts for 2.4 months, from November 25 to February 9, with an average daily high temperature below 75°F. The coldest day of the year is January 5, with an average low of 49°F and high of 70°F.
Average High and Low Temperature
The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature
In Monterrey, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.
The clearer part of the year in Monterrey begins around April 15 and lasts for 2.4 months, ending around June 27. On June 1, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 77% of the time, and overcast or mostly cloudy 23% of the time.
The cloudier part of the year begins around June 27 and lasts for 9.6 months, ending around April 15. On September 6, the cloudiest day of the year, the sky is overcast or mostly cloudy 53% of the time, and clear, mostly clear, or partly cloudy 47% of the time.
Cloud Cover Categories
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Monterrey varies significantly throughout the year.
The wetter season lasts 4.8 months, from May 14 to October 8, with a greater than 22% chance of a given day being a wet day. The chance of a wet day peaks at 39% on September 9.
The drier season lasts 7.2 months, from October 8 to May 14. The smallest chance of a wet day is 4% on December 10.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 39% on September 9.
Daily Chance of Precipitation
To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Monterrey experiences significant seasonal variation in monthly rainfall.
The rainy period of the year lasts for 10 months, from January 13 to November 23, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around September 13, with an average total accumulation of 3.8 inches.
The rainless period of the year lasts for 1.7 months, from November 23 to January 13. The least rain falls around December 17, with an average total accumulation of 0.4 inches.
Average Monthly Rainfall
The length of the day in Monterrey varies over the course of the year. In 2017, the shortest day is December 21, with 10 hours, 32 minutes of daylight; the longest day is June 20, with 13 hours, 45 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 6:32 AM on April 1, and the latest sunrise is 1 hour, 15 minutes later at 7:47 AM on October 28. The earliest sunset is at 5:49 PM on November 29, and the latest sunset is 2 hours, 47 minutes later at 8:36 PM on July 2.
Daylight saving time (DST) is observed in Monterrey during 2017, starting in the spring on April 2, lasting 6.8 months, and ending in the fall on October 29.
Sunrise & Sunset with Twilight and Daylight Saving Time
We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.
Monterrey experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 6.0 months, from April 27 to October 27, during which time the comfort level is muggy, oppressive, or miserable at least 20% of the time. The muggiest day of the year is September 4, with muggy conditions 76% of the time.
The least muggy day of the year is February 13, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.
The average hourly wind speed in Monterrey experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 6.1 months, from March 6 to September 8, with average wind speeds of more than 4.2 miles per hour. The windiest day of the year is July 3, with an average hourly wind speed of 5.1 miles per hour.
The calmer time of year lasts for 5.9 months, from September 8 to March 6. The calmest day of the year is December 6, with an average hourly wind speed of 3.3 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Monterrey is from the east throughout the year.
This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.
The average daily incident shortwave solar energy experiences significant seasonal variation over the course of the year.
The brighter period of the year lasts for 4.4 months, from April 6 to August 17, with an average daily incident shortwave energy per square meter above 6.7 kWh. The brightest day of the year is June 13, with an average of 7.5 kWh.
The darker period of the year lasts for 2.6 months, from November 12 to February 1, with an average daily incident shortwave energy per square meter below 4.7 kWh. The darkest day of the year is December 19, with an average of 3.9 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Monterrey are 25.675 deg latitude, -100.318 deg longitude, and 1,798 ft elevation.
The topography within 2 miles of Monterrey contains significant variations in elevation, with a maximum elevation change of 761 feet and an average elevation above sea level of 1,824 feet. Within 10 miles contains significant variations in elevation (5,879 feet). Within 50 miles also contains extreme variations in elevation (11,578 feet).
The area within 2 miles of Monterrey is covered by artificial surfaces (65%) and shrubs (30%), within 10 miles by artificial surfaces (41%) and shrubs (29%), and within 50 miles by shrubs (48%) and trees (25%).
This report illustrates the typical weather in Monterrey, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Monterrey.
For each station, the records are corrected for the elevation difference between that station and Monterrey according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Monterrey is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Monterrey and a given station.
The stations contributing to this reconstruction are: Del Norte International Airport (53%, 23 kilometers, north); General Mariano Escobedo International Airport (42%, 24 kilometers, northeast); and Plan de Guadalupe International Airport (6%, 63 kilometers, west).
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.
All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.
Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for aiports and weather stations are provided by AskGeo.com .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.