Average Weather in April in San Francisco Ocotlán Mexico
Daily low temperatures increase by 3°F, from 49°F to 52°F, rarely falling below 44°F or exceeding 56°F.
For reference, on May 4, the hottest day of the year, temperatures in San Francisco Ocotlán typically range from 52°F to 79°F, while on January 12, the coldest day of the year, they range from 42°F to 69°F.
Average High and Low Temperature in April
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on April. The horizontal axis is the day, 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 April
Cochabamba, Bolivia (3,339 miles away); Dhamār, Yemen (9,004 miles); and Faratsiho, Madagascar (10,184 miles) are the far-away foreign places with temperatures most similar to San Francisco Ocotlán (view comparison).
The month of April in San Francisco Ocotlán experiences increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 35% to 47%.
The clearest day of the month is April 1, with clear, mostly clear, or partly cloudy conditions 65% of the time.
For reference, on September 15, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 88%, while on February 25, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 70%.
Cloud Cover Categories in April
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In San Francisco Ocotlán, the chance of a wet day over the course of April is very rapidly increasing, starting the month at 8% and ending it at 20%.
For reference, the year's highest daily chance of a wet day is 75% on July 2, and its lowest chance is 3% on December 13.
Probability of Precipitation in April
To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during April in San Francisco Ocotlán is increasing, starting the month at 0.4 inches, when it rarely exceeds 1.1 inches, and ending the month at 1.0 inches, when it rarely exceeds 2.1 inches or falls below 0.1 inches.
Average Monthly Rainfall in April
Over the course of April in San Francisco Ocotlán, the length of the day is gradually increasing. From the start to the end of the month, the length of the day increases by 30 minutes, implying an average daily increase of 1 minute, 1 second, and weekly increase of 7 minutes, 9 seconds.
The shortest day of the month is April 1, with 12 hours, 20 minutes of daylight and the longest day is April 30, with 12 hours, 50 minutes of daylight.
Hours of Daylight and Twilight in April
The latest sunrise of the month in San Francisco Ocotlán is 7:27 AM on April 1 and the earliest sunrise is 21 minutes earlier at 7:05 AM on April 30.
The earliest sunset is 7:47 PM on April 1 and the latest sunset is 8 minutes later at 7:55 PM on April 30.
Daylight saving time (DST) starts at 3:00 AM on April 1, 2018, shifting sunrise and sunset to be an hour later.
For reference, on June 21, the longest day of the year, the Sun rises at 6:56 AM and sets 13 hours, 17 minutes later, at 8:13 PM, while on December 21, the shortest day of the year, it rises at 7:01 AM and sets 10 hours, 59 minutes later, at 6:00 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in April
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 chance that a given day will be muggy in San Francisco Ocotlán is essentially constant during April, remaining around 0% throughout.
For reference, on September 14, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in April
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 San Francisco Ocotlán is gradually decreasing during April, decreasing from 6.3 miles per hour to 5.3 miles per hour over the course of the month.
For reference, on March 8, the windiest day of the year, the daily average wind speed is 6.6 miles per hour, while on May 25, the calmest day of the year, the daily average wind speed is 4.8 miles per hour.
Average Wind Speed in April
Wind Direction in April
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 San Francisco Ocotlán over some winters. The day least likely to be in the growing season is January 2, with a 72% chance.
Time Spent in Various Temperature Bands and the Growing Season in April
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.
The average accumulated growing degree days in San Francisco Ocotlán are increasing during April, increasing by 415°F, from 819°F to 1,235°F, over the course of the month.
Growing Degree Days in April
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 in San Francisco Ocotlán is essentially constant during April, remaining within 0.1 kWh of 7.2 kWh throughout.
The highest average daily incident shortwave solar energy during April is 7.3 kWh on April 18.
Average Daily Incident Shortwave Solar Energy in April
For the purposes of this report, the geographical coordinates of San Francisco Ocotlán are 19.134 deg latitude, -98.283 deg longitude, and 7,185 ft elevation.
The topography within 2 miles of San Francisco Ocotlán contains only modest variations in elevation, with a maximum elevation change of 167 feet and an average elevation above sea level of 7,198 feet. Within 10 miles contains only modest variations in elevation (1,486 feet). Within 50 miles contains very significant variations in elevation (14,390 feet).
The area within 2 miles of San Francisco Ocotlán is covered by cropland (100%), within 10 miles by cropland (74%) and artificial surfaces (20%), and within 50 miles by cropland (47%) and trees (21%).
This report illustrates the typical weather in San Francisco Ocotlán year round, 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 is only a single weather station, Hermanos Serdán International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of San Francisco Ocotlán.
At a distance of 10 kilometers from San Francisco Ocotlán, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.
The station records are corrected for the elevation difference between the station and San Francisco Ocotlán according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis.
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.
The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.
We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.
We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.