Climate and Average Weather Year Round in Lewisville Texas, United States
In Lewisville, the summers are hot and muggy, the winters are cold and windy, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 37°F to 96°F and is rarely below 25°F or above 102°F.
Based on the beach/pool score, the best time of year to visit Lewisville for hot-weather activities is from late May to late September.
Climate in Lewisville
The hot season lasts for 3.4 months, from June 3 to September 17, with an average daily high temperature above 88°F. The hottest month of the year in Lewisville is August, with an average high of 95°F and low of 76°F.
The cool season lasts for 3.0 months, from November 25 to February 24, with an average daily high temperature below 64°F. The coldest month of the year in Lewisville is January, with an average low of 38°F and high of 57°F.
Average High and Low Temperature in Lewisville
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 Lewisville
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
In Lewisville, the average percentage of the sky covered by clouds experiences mild seasonal variation over the course of the year.
The clearer part of the year in Lewisville begins around May 29 and lasts for 5.5 months, ending around November 13.
The clearest month of the year in Lewisville is October, during which on average the sky is clear, mostly clear, or partly cloudy 71% of the time.
The cloudier part of the year begins around November 13 and lasts for 6.5 months, ending around May 29.
The cloudiest month of the year in Lewisville is February, during which on average the sky is overcast or mostly cloudy 45% of the time.
Cloud Cover Categories in Lewisville
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Lewisville varies throughout the year.
The wetter season lasts 6.2 months, from April 15 to October 22, with a greater than 26% chance of a given day being a wet day. The month with the most wet days in Lewisville is May, with an average of 11.0 days with at least 0.04 inches of precipitation.
The drier season lasts 5.8 months, from October 22 to April 15. The month with the fewest wet days in Lewisville is January, with an average of 5.0 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 Lewisville is May, with an average of 11.0 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 37% on May 27.
Daily Chance of Precipitation in Lewisville
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. Lewisville experiences significant seasonal variation in monthly rainfall.
Rain falls throughout the year in Lewisville. The month with the most rain in Lewisville is May, with an average rainfall of 4.3 inches.
The month with the least rain in Lewisville is July, with an average rainfall of 1.7 inches.
Average Monthly Rainfall in Lewisville
The length of the day in Lewisville varies significantly over the course of the year. In 2021, the shortest day is December 21, with 9 hours, 58 minutes of daylight; the longest day is June 20, with 14 hours, 20 minutes of daylight.
Hours of Daylight and Twilight in Lewisville
The earliest sunrise is at 6:18 AM on June 11, and the latest sunrise is 1 hour, 32 minutes later at 7:50 AM on November 6. The earliest sunset is at 5:20 PM on December 3, and the latest sunset is 3 hours, 20 minutes later at 8:40 PM on June 29.
Daylight saving time (DST) is observed in Lewisville during 2021, starting in the spring on March 14, lasting 7.8 months, and ending in the fall on November 7.
Sunrise & Sunset with Twilight and Daylight Saving Time in Lewisville
The figure below presents a compact representation of key lunar data for 2021. 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.
Moon Rise, Set & Phases in Lewisville
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.
Lewisville experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 5.3 months, from April 29 to October 6, during which time the comfort level is muggy, oppressive, or miserable at least 21% of the time. The month with the most muggy days in Lewisville is July, with 24.7 days that are muggy or worse.
The month with the fewest muggy days in Lewisville is February, with 0.1 days that are muggy or worse.
Humidity Comfort Levels in Lewisville
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 Lewisville experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 7.3 months, from October 26 to June 3, with average wind speeds of more than 10.1 miles per hour. The windiest month of the year in Lewisville is March, with an average hourly wind speed of 11.7 miles per hour.
The calmer time of year lasts for 4.7 months, from June 3 to October 26. The calmest month of the year in Lewisville is August, with an average hourly wind speed of 8.3 miles per hour.
Average Wind Speed in Lewisville
The predominant average hourly wind direction in Lewisville varies throughout the year.
The wind is most often from the south for 10 months, from February 9 to December 23, with a peak percentage of 70% on July 5. The wind is most often from the north for 1.5 months, from December 23 to February 9, with a peak percentage of 38% on January 1.
Wind Direction in Lewisville
To characterize how pleasant the weather is in Lewisville 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 times of year to visit Lewisville for general outdoor tourist activities are from mid April to early June and from mid September to late October, with a peak score in the first week of October.
Tourism Score in Lewisville
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 Lewisville for hot-weather activities is from late May to late September, with a peak score in the last week of June.
Beach/Pool Score in Lewisville
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).
The growing season in Lewisville typically lasts for 8.7 months (267 days), from around March 5 to around November 27, rarely starting before February 2 or after March 26, and rarely ending before November 6 or after December 18.
Time Spent in Various Temperature Bands and the Growing Season in Lewisville
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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 Lewisville should appear around January 28, only rarely appearing before January 15 or after February 13.
Growing Degree Days in Lewisville
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 12 to August 23, with an average daily incident shortwave energy per square meter above 6.1 kWh. The brightest month of the year in Lewisville is July, with an average of 6.9 kWh.
The darker period of the year lasts for 2.9 months, from November 9 to February 5, with an average daily incident shortwave energy per square meter below 3.6 kWh. The darkest month of the year in Lewisville is December, with an average of 2.9 kWh.
Average Daily Incident Shortwave Solar Energy in Lewisville
For the purposes of this report, the geographical coordinates of Lewisville are 33.046 deg latitude, -96.994 deg longitude, and 518 ft elevation.
The topography within 2 miles of Lewisville contains only modest variations in elevation, with a maximum elevation change of 141 feet and an average elevation above sea level of 507 feet. Within 10 miles also contains only modest variations in elevation (312 feet). Within 50 miles contains only modest variations in elevation (948 feet).
The area within 2 miles of Lewisville is covered by artificial surfaces (84%), within 10 miles by artificial surfaces (63%) and water (15%), and within 50 miles by grassland (48%) and cropland (23%).
This report illustrates the typical weather in Lewisville, 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Lewisville.
For each station, the records are corrected for the elevation difference between that station and Lewisville 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 Lewisville is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Lewisville and a given station.
The stations contributing to this reconstruction are:
To get a sense of how much these sources agree with each other, you can view a comparison of Lewisville 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.
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 © 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.
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