Daily high temperatures are around 73°F, rarely falling below 67°F or exceeding 77°F.
Daily low temperatures decrease by 4°F, from 52°F to 48°F, rarely falling below 41°F or exceeding 57°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 October
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on October. 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 October
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < very cold < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The shaded overlays indicate night and civil twilight.
The month of October in San Francisco Ocotlán experiences very rapidly decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 82% to 57%.
The clearest day of the month is October 31, with clear, mostly clear, or partly cloudy conditions 43% 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 October
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.
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 October is very rapidly decreasing, starting the month at 53% and ending it at 19%.
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 October
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).
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 October in San Francisco Ocotlán is very rapidly decreasing, starting the month at 3.8 inches, when it rarely exceeds 6.0 inches or falls below 1.8 inches, and ending the month at 1.2 inches, when it rarely exceeds 2.4 inches or falls below 0.2 inches.
Average Monthly Rainfall in October
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.
Over the course of October in San Francisco Ocotlán, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 31 minutes, implying an average daily decrease of 1 minute, 1 second, and weekly decrease of 7 minutes, 10 seconds.
The shortest day of the month is October 31, with 11 hours, 27 minutes of daylight and the longest day is October 1, with 11 hours, 58 minutes of daylight.
Hours of Daylight and Twilight in October
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.
The latest sunrise of the month in San Francisco Ocotlán is 7:31 AM on October 27 and the earliest sunrise is 60 minutes earlier at 6:31 AM on October 28.
The latest sunset is 7:21 PM on October 1 and the earliest sunset is 1 hour, 21 minutes earlier at 6:00 PM on October 31.
Daylight saving time (DST) ends at 1:00 AM on October 28, 2018, shifting sunrise and sunset to be an hour earlier.
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 October
The solar day over the course of October. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight saving time are indicated by the 'DST' labels.
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 October, 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 October
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.
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 essentially constant during October, remaining within 0.1 miles per hour of 6.2 miles per hour throughout.
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.
The highest daily average wind speed during October is 6.3 miles per hour on October 29.
Average Wind Speed in October
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
The wind direction in San Francisco Ocotlán during October is predominantly out of the east from October 1 to October 3 and the north from October 3 to October 31.
Wind Direction in October
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).
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 October
The percentage of time spent in various temperature bands: frigid < 15°F < freezing < 32°F < very cold < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The black line is the percentage chance that a given day is within the growing season.
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 October, increasing by 328°F, from 3,299°F to 3,627°F, over the course of the month.
Growing Degree Days in October
The average growing degree days accumulated over the course of October, with 25th to 75th and 10th to 90th percentile bands.
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 October, remaining within 0.1 kWh of 5.8 kWh throughout.
Average Daily Incident Shortwave Solar Energy in October
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.
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.
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.
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.