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Fall Weather in Allen Texas, United States

Daily high temperatures decrease by 31°F, from 92°F to 61°F, rarely falling below 47°F or exceeding 98°F.

Daily low temperatures decrease by 30°F, from 71°F to 42°F, rarely falling below 30°F or exceeding 77°F.

For reference, on July 31, the hottest day of the year, temperatures in Allen typically range from 75°F to 95°F, while on January 5, the coldest day of the year, they range from 36°F to 55°F.

Average High and Low Temperature in the Fall in Allen

Average High and Low Temperature in the Fall in AllenSepOctNov20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FSummerWinterSep 192°FSep 192°F71°F71°FNov 3061°FNov 3061°F42°F42°FOct 182°FOct 182°F61°F61°FNov 171°FNov 171°F51°F51°F
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 fall temperatures. 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 the Fall in Allen

Average Hourly Temperature in the Fall in AllenSepOctNov12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMSummerWintervery coldvery coldcoldcoolcomfortablewarmhot
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 average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Ar Rudayyif, Tunisia (5,702 miles away) and Açıkdere, Turkey (6,772 miles) are the far-away foreign places with temperatures most similar to Allen (view comparison).

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The fall in Allen experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 32% to 40%. The lowest chance of overcast or mostly cloudy conditions is 26% on October 4.

The clearest day of the fall is October 4, with clear, mostly clear, or partly cloudy conditions 74% of the time.

For reference, on February 24, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 46%, while on October 4, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 74%.

Cloud Cover Categories in the Fall in Allen

Cloud Cover Categories in the Fall in AllenSepOctNov0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%SummerWinterFeb 2454%Feb 2454%Sep 168%Sep 168%Nov 3060%Nov 3060%Oct 173%Oct 173%Nov 167%Nov 167%clearmostly clearpartly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Allen, the chance of a wet day over the course of the fall is essentially constant, remaining around 23% throughout.

For reference, the year's highest daily chance of a wet day is 38% on May 31, and its lowest chance is 16% on December 31.

Over the course of the fall in Allen, the chance of a day with only rain decreases from 23% to 20%, the chance of a day with mixed snow and rain remains an essentially constant 1% throughout, and the chance of a day with only snow remains an essentially constant 0% throughout.

Probability of Precipitation in the Fall in Allen

Probability of Precipitation in the Fall in AllenSepOctNov0%0%5%5%10%10%15%15%20%20%25%25%30%30%SummerWinterOct 1927%Oct 1927%Sep 123%Sep 123%Nov 3022%Nov 3022%Oct 123%Oct 123%Nov 122%Nov 122%rainmixedsnow
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).

Rainfall

To show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during the fall in Allen is gradually increasing, starting the season at 2.3 inches, when it rarely exceeds 4.7 inches or falls below 0.4 inches, and ending the season at 2.7 inches, when it rarely exceeds 5.0 inches or falls below 0.5 inches.

The highest average 31-day accumulation is 3.8 inches on October 21.

Average Monthly Rainfall in the Fall in Allen

Average Monthly Rainfall in the Fall in AllenSepOctNov0 in0 in2 in2 in4 in4 in6 in6 in8 in8 inSummerWinterOct 213.8 inOct 213.8 inSep 12.3 inSep 12.3 inNov 302.7 inNov 302.7 inOct 13.1 inOct 13.1 in
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 snowfall.

Over the course of the fall in Allen, the length of the day is very rapidly decreasing. From the start to the end of the season, the length of the day decreases by 2 hours, 41 minutes, implying an average daily decrease of 1 minute, 48 seconds, and weekly decrease of 12 minutes, 33 seconds.

The shortest day of the fall is November 30, with 10 hours, 8 minutes of daylight and the longest day is September 1, with 12 hours, 49 minutes of daylight.

Hours of Daylight and Twilight in the Fall in Allen

Hours of Daylight and Twilight in the Fall in AllenSepOctNov0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrSummerWinterSep 2212 hr, 9 minSep 2212 hr, 9 minnightnightdaydayNov 3010 hr, 8 minNov 3010 hr, 8 minNov 110 hr, 49 minNov 110 hr, 49 min
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 fall in Allen is 7:46 AM on November 2 and the earliest sunrise is 59 minutes earlier at 6:47 AM on November 3.

The latest sunset is 7:50 PM on September 1 and the earliest sunset is 2 hours, 31 minutes earlier at 5:19 PM on November 30.

Daylight saving time (DST) starts at 1:00 AM on November 3, 2024, shifting sunrise and sunset to be an hour later.

For reference, on June 20, the longest day of the year, the Sun rises at 6:18 AM and sets 14 hours, 21 minutes later, at 8:38 PM, while on December 21, the shortest day of the year, it rises at 7:26 AM and sets 9 hours, 58 minutes later, at 5:24 PM.

Sunrise & Sunset with Twilight and Daylight Saving Time in the Fall in Allen

Sunrise & Sunset with Twilight and Daylight Saving Time in the Fall in AllenSepOctNov2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMSummerWinter6:47 AM6:47 AMNov 35:32 PMNov 35:32 PM7:01 AM7:01 AMSep 17:50 PMSep 17:50 PM7:11 AM7:11 AMNov 305:19 PMNov 305:19 PM7:21 AM7:21 AMOct 17:10 PMOct 17:10 PMDSTNov 3DSTNov 3SolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day in the fall. 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.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth in the Fall in Allen

Solar Elevation and Azimuth in the Fall in AllenSepOctNov12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMSummerWinter01020203040506000102030304070
northeastsouthwest
Solar elevation and azimuth in the the fall of 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for the fall of 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. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

Moon Rise, Set & Phases in the Fall in Allen

Moon Rise, Set & Phases in the Fall in AllenSepOctNov12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMSummerWinterAug 46:14 AMAug 46:14 AMAug 191:26 PMAug 191:26 PMSep 28:56 PMSep 28:56 PMSep 179:35 PMSep 179:35 PMOct 21:50 PMOct 21:50 PMOct 176:27 AMOct 176:27 AMNov 17:48 AMNov 17:48 AMNov 153:29 PMNov 153:29 PMDec 112:22 AMDec 112:22 AMDec 153:02 AMDec 153:02 AMDec 304:28 PMDec 304:28 PM8:55 PM8:55 PM7:49 PM7:49 PM6:32 AM6:32 AM6:31 AM6:31 AM7:53 PM7:53 PM7:26 PM7:26 PM7:44 AM7:44 AM7:11 AM7:11 AM7:09 PM7:09 PM6:24 PM6:24 PM7:42 AM7:42 AM7:53 AM7:53 AM6:32 PM6:32 PM5:07 PM5:07 PM7:59 AM7:59 AM5:29 PM5:29 PM4:34 PM4:34 PM7:55 AM7:55 AM5:11 PM5:11 PM
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

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 Allen is very rapidly decreasing during the fall, falling from 66% to 2% over the course of the season.

For reference, on July 5, the muggiest day of the year, there are muggy conditions 86% of the time, while on January 21, the least muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in the Fall in Allen

Humidity Comfort Levels in the Fall in AllenSepOctNov0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%SummerWinterSep 166%Sep 166%Nov 302%Nov 302%Oct 128%Oct 128%Nov 19%Nov 19%oppressiveoppressivemuggymuggyhumidhumiddrydrycomfortablecomfortable
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

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 Allen is rapidly increasing during the fall, increasing from 8.2 miles per hour to 10.5 miles per hour over the course of the season.

For reference, on April 1, the windiest day of the year, the daily average wind speed is 11.9 miles per hour, while on August 22, the calmest day of the year, the daily average wind speed is 8.0 miles per hour.

The highest daily average wind speed during the fall is 10.6 miles per hour on November 19.

Average Wind Speed in the Fall in Allen

Average Wind Speed in the Fall in AllenSepOctNov0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mphSummerWinterNov 1910.6 mphNov 1910.6 mphSep 18.2 mphSep 18.2 mphOct 19.2 mphOct 19.2 mphNov 110.2 mphNov 110.2 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The hourly average wind direction in Allen throughout the fall is predominantly from the south, with a peak proportion of 51% on September 1.

Wind Direction in the Fall in Allen

Wind Direction in the Fall in AllenSNSepOctNov0%100%20%80%40%60%60%40%80%20%100%0%SummerWintersoutheastnorthwest
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 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).

The growing season in Allen typically lasts for 8.4 months (256 days), from around March 9 to around November 20, rarely starting before February 14 or after April 2, and rarely ending before October 31 or after December 11.

During the fall in Allen, the chance that a given day is within the growing season is very rapidly decreasing falling from 100% to 28% over the course of the season.

Time Spent in Various Temperature Bands and the Growing Season in the Fall in Allen

Time Spent in Various Temperature Bands and the Growing Season in the Fall in Allengrowing seasonSepOctNov0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%SummerWinter100%Sep 1100%Sep 1Nov 3028%Nov 3028%100%Oct 1100%Oct 188%Nov 188%Nov 1Dec 1110%Dec 1110%freezingvery coldcoldcoolcomfortablewarmhotsweltering
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 percentage of time spent in various temperature bands. 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 Allen are very rapidly increasing during the fall, increasing by 1,480°F, from 4,439°F to 5,918°F, over the course of the season.

Growing Degree Days in the Fall in Allen

Growing Degree Days in the Fall in AllenSepOctNov4,500°F4,500°F5,000°F5,000°F5,500°F5,500°F6,000°F6,000°FSummerWinterSep 14,439°FSep 14,439°FNov 305,918°FNov 305,918°FOct 15,198°FOct 15,198°FNov 15,688°FNov 15,688°F
The average growing degree days accumulated over the course of the fall, 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 Allen is very rapidly decreasing during the fall, falling by 2.8 kWh, from 5.8 kWh to 3.0 kWh, over the course of the season.

Average Daily Incident Shortwave Solar Energy in the Fall in Allen

Average Daily Incident Shortwave Solar Energy in the Fall in AllenSepOctNov0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWhSummerWinterSep 15.8 kWhSep 15.8 kWhNov 303.0 kWhNov 303.0 kWhOct 15.1 kWhOct 15.1 kWhNov 13.8 kWhNov 13.8 kWh
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 Allen are 33.103 deg latitude, -96.671 deg longitude, and 656 ft elevation.

The topography within 2 miles of Allen contains only modest variations in elevation, with a maximum elevation change of 131 feet and an average elevation above sea level of 648 feet. Within 10 miles also contains only modest variations in elevation (331 feet). Within 50 miles contains only modest variations in elevation (735 feet).

The area within 2 miles of Allen is covered by artificial surfaces (77%) and cropland (23%), within 10 miles by artificial surfaces (54%) and cropland (24%), and within 50 miles by grassland (37%) and cropland (33%).

This report illustrates the typical weather in Allen, 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 Allen.

For each station, the records are corrected for the elevation difference between that station and Allen 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 Allen is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Allen and a given station.

The stations contributing to this reconstruction are:

  • McKinney Municipal Airport (KTKI, 58%, 8 mi, northeast, -72 ft elevation change)
  • Addison Airport (KADS, 26%, 13 mi, southwest, -13 ft elevation change)
  • Rockwall Municipal (KF46, 16%, 18 mi, southeast, -82 ft elevation change)

Sources mapKTKI, 58%8 mi, -72 ftKADS, 26%13 mi, -13 ftKF46, 16%18 mi, -82 ft© OpenStreetMap contributors

To get a sense of how much these sources agree with each other, you can view a comparison of Allen and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , 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 airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

Disclaimer

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.

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