Climate and Average Weather Year Round in Chalco Mexico

In Chalco, the wet season is overcast, the dry season is partly cloudy, and it is comfortable year round. Over the course of the year, the temperature typically varies from 43°F to 79°F and is rarely below 37°F or above 85°F.

Based on the tourism score, the best time of year to visit Chalco for warm-weather activities is from late March to late May.

The warm season lasts for 2.5 months, from March 22 to June 6, with an average daily high temperature above 77°F. The hottest month of the year in Chalco is May, with an average high of 79°F and low of 55°F.

The cool season lasts for 2.4 months, from November 22 to February 3, with an average daily high temperature below 72°F. The coldest month of the year in Chalco is January, with an average low of 44°F and high of 70°F.

In Chalco, the average percentage of the sky covered by clouds experiences extreme seasonal variation over the course of the year.

The clearer part of the year in Chalco begins around October 29 and lasts for 6.9 months, ending around May 26.

The clearest month of the year in Chalco is February, during which on average the sky is clear, mostly clear, or partly cloudy 66% of the time.

The cloudier part of the year begins around May 26 and lasts for 5.1 months, ending around October 29.

The cloudiest month of the year in Chalco is September, during which on average the sky is overcast or mostly cloudy 88% of the time.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Chalco varies very significantly throughout the year.

The wetter season lasts 4.5 months, from May 24 to October 10, with a greater than 41% chance of a given day being a wet day. The month with the most wet days in Chalco is July, with an average of 23.0 days with at least 0.04 inches of precipitation.

The drier season lasts 7.5 months, from October 10 to May 24. The month with the fewest wet days in Chalco is December, with an average of 1.0 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone in Chalco is July, with an average of 23.0 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 78% on June 27.

Rainfall

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. Chalco experiences extreme seasonal variation in monthly rainfall.

The rainy period of the year lasts for 7.2 months, from April 8 to November 14, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Chalco is July, with an average rainfall of 5.1 inches.

The rainless period of the year lasts for 4.8 months, from November 14 to April 8. The month with the least rain in Chalco is December, with an average rainfall of 0.2 inches.

The length of the day in Chalco varies over the course of the year. In 2024, the shortest day is December 21, with 10 hours, 58 minutes of daylight; the longest day is June 20, with 13 hours, 18 minutes of daylight.

The earliest sunrise is at 5:56 AM on June 5, and the latest sunrise is 1 hour, 15 minutes later at 7:12 AM on January 18. The earliest sunset is at 5:55 PM on November 24, and the latest sunset is 1 hour, 22 minutes later at 7:17 PM on July 4.

Daylight saving time (DST) is not observed in Chalco during 2024.

The figure below presents a compact representation of key lunar data for 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases.

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.

The perceived humidity level in Chalco, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout.

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 Chalco experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 3.8 months, from December 29 to April 24, with average wind speeds of more than 4.7 miles per hour. The windiest month of the year in Chalco is March, with an average hourly wind speed of 5.5 miles per hour.

The calmer time of year lasts for 8.2 months, from April 24 to December 29. The calmest month of the year in Chalco is May, with an average hourly wind speed of 4.1 miles per hour.

The predominant average hourly wind direction in Chalco varies throughout the year.

The wind is most often from the east for 3.7 months, from June 9 to September 30, with a peak percentage of 62% on July 24. The wind is most often from the north for 2.1 months, from September 30 to December 2, with a peak percentage of 42% on October 28. The wind is most often from the south for 6.2 months, from December 2 to June 9, with a peak percentage of 36% on January 1.

To characterize how pleasant the weather is in Chalco throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Chalco for general outdoor tourist activities is from late March to late May, with a peak score in the last week of April.

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Chalco for hot-weather activities is from late March to late May, with a peak score in the last week of April.

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

While it does not do so every year, freezing temperatures are seen in Chalco over some winters. The day least likely to be in the growing season is January 8, with a 77% chance.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

Based on growing degree days alone, the first spring blooms in Chalco should appear around January 13, only rarely appearing before January 11 or after January 15.

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 some seasonal variation over the course of the year.

The brighter period of the year lasts for 2.6 months, from March 6 to May 27, with an average daily incident shortwave energy per square meter above 6.8 kWh. The brightest month of the year in Chalco is April, with an average of 7.3 kWh.

The darker period of the year lasts for 2.5 months, from November 9 to January 24, with an average daily incident shortwave energy per square meter below 5.5 kWh. The darkest month of the year in Chalco is December, with an average of 5.1 kWh.

For the purposes of this report, the geographical coordinates of Chalco are 19.262 deg latitude, -98.898 deg longitude, and 7,365 ft elevation.

The topography within 2 miles of Chalco contains only modest variations in elevation, with a maximum elevation change of 98 feet and an average elevation above sea level of 7,356 feet. Within 10 miles contains only modest variations in elevation (2,822 feet). Within 50 miles contains large variations in elevation (14,885 feet).

The area within 2 miles of Chalco is covered by artificial surfaces (61%) and cropland (39%), within 10 miles by cropland (45%) and artificial surfaces (26%), and within 50 miles by cropland (43%) and trees (23%).