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Average Weather in Union City Georgia, United States

In Union City, the summers are hot and muggy; the winters are short, cold, and wet; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 36°F to 89°F and is rarely below 22°F or above 95°F.

Climate Summary

coldcoolcomfortablewarmhotwarmcoolJanFebMarAprMayJunJulAugSepOctNovDec67%67%46%46%clearovercastprecipitation: 4.7 inprecipitation: 4.7 in2.8 in2.8 inmuggy: 87%muggy: 87%0%0%drydrytourism score: 6.7tourism score: 6.71.21.2
Click on each chart for more information.

Based on the tourism score, the best times of year to visit Union City for warm-weather activities are from early May to mid June and from late August to mid October.

Temperature

The hot season lasts for 3.8 months, from May 24 to September 17, with an average daily high temperature above 82°F. The hottest day of the year is July 23, with an average high of 89°F and low of 72°F.

The cool season lasts for 2.9 months, from November 28 to February 25, with an average daily high temperature below 60°F. The coldest day of the year is January 23, with an average low of 36°F and high of 53°F.

Average High and Low Temperature

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 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

Average Hourly Temperature in Union CityJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMvery coldcoldcoldcoolcoolcomfortablewarmhotvery coldwarmvery coldvery cold
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.

Baiyun, China (8,048 miles away) is the far-away foreign place with temperatures most similar to Union City (view comparison).

Clouds

In Union City, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year in Union City begins around July 25 and lasts for 4.0 months, ending around November 25. On October 8, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 67% of the time, and overcast or mostly cloudy 33% of the time.

The cloudier part of the year begins around November 25 and lasts for 8.0 months, ending around July 25. On January 3, the cloudiest day of the year, the sky is overcast or mostly cloudy 54% of the time, and clear, mostly clear, or partly cloudy 46% of the time.

Cloud Cover Categories

Cloud Cover Categories in Union CityclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Oct 867%Oct 867%Jan 346%Jan 346%Jul 2556%Jul 2556%Nov 2556%Nov 2556%clearmostly clearpartly cloudymostly cloudyovercast
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.

Precipitation

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

The wetter season lasts 7.2 months, from January 22 to August 30, with a greater than 32% chance of a given day being a wet day. The chance of a wet day peaks at 44% on July 9.

The drier season lasts 4.8 months, from August 30 to January 22. The smallest chance of a wet day is 19% on October 29.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 44% on July 9.

Daily Chance of Precipitation

Daily Chance of Precipitation in Union CitywetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jul 944%Jul 944%Oct 2919%Oct 2919%Jan 129%Jan 129%Jan 2232%Jan 2232%Aug 3032%Aug 3032%rainmixed
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 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. Union City experiences some seasonal variation in monthly rainfall.

Rain falls throughout the year in Union City. The most rain falls during the 31 days centered around March 1, with an average total accumulation of 4.6 inches.

The least rain falls around October 22, with an average total accumulation of 2.8 inches.

Average Monthly Rainfall

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.

Snowfall

The sliding 31-day liquid-equivalent quantity of snowfall in Union City does not vary significantly over the course of the year, staying within 0.1 inches of 0.1 inches throughout.

Average Liquid-Equivalent Monthly Snowfall

Average Liquid-Equivalent Monthly Snowfall in Union CitysnowJanFebMarAprMayJunJulAugSepOctNovDec0 in1 in2 in3 in4 in5 inJan 170.1 inJan 170.1 inJul 300.0 inJul 300.0 inDec 300.1 inDec 300.1 in
The average liquid-equivalent snowfall (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 rainfall.

Sun

The length of the day in Union City varies significantly over the course of the year. In 2018, the shortest day is December 21, with 9 hours, 55 minutes of daylight; the longest day is June 21, with 14 hours, 23 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight in Union CityJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 8 minMar 2012 hr, 8 minMar 2014 hr, 23 minJun 2114 hr, 23 minJun 2112 hr, 9 minSep 2212 hr, 9 minSep 229 hr, 55 minDec 219 hr, 55 minDec 21nightnightday
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 earliest sunrise is at 6:27 AM on June 12, and the latest sunrise is 1 hour, 31 minutes later at 7:58 AM on November 3. The earliest sunset is at 5:29 PM on December 4, and the latest sunset is 3 hours, 23 minutes later at 8:52 PM on June 29.

Daylight saving time (DST) is observed in Union City during 2018, starting in the spring on March 11, lasting 7.8 months, and ending in the fall on November 4.

Sunrise & Sunset with Twilight and Daylight Saving Time

Sunrise & Sunset with Twilight and Daylight Saving Time in Union CityJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 126:27 AMJun 126:27 AM8:52 PMJun 298:52 PMJun 29Dec 45:29 PMDec 45:29 PM7:58 AMNov 37:58 AMNov 3Mar 11DSTMar 11DSTDSTNov 4DSTNov 4daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of the year 2018. 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.

Humidity

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.

Union City experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 4.4 months, from May 20 to October 1, during which time the comfort level is muggy, oppressive, or miserable at least 22% of the time. The muggiest day of the year is July 25, with muggy conditions 87% of the time.

The least muggy day of the year is January 17, when muggy conditions are essentially unheard of.

Humidity Comfort Levels

Humidity Comfort Levels in Union CitymuggyJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jan 170%Jan 170%87%Jul 2587%Jul 25May 2022%May 2022%Oct 122%Oct 122%oppressiveoppressivemuggymuggydrydryhumidhumidcomfortablecomfortable
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.

Wind

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 Union City experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 6.8 months, from October 20 to May 12, with average wind speeds of more than 5.4 miles per hour. The windiest day of the year is March 8, with an average hourly wind speed of 6.7 miles per hour.

The calmer time of year lasts for 5.2 months, from May 12 to October 20. The calmest day of the year is August 5, with an average hourly wind speed of 4.0 miles per hour.

Average Wind Speed

Average Wind Speed in Union CitywindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph1 mph2 mph3 mph4 mph5 mph6 mph7 mph8 mph9 mph10 mph11 mphMar 86.7 mphMar 86.7 mphAug 54.0 mphAug 54.0 mphOct 205.4 mphOct 205.4 mphMay 125.4 mphMay 125.4 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

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

The wind is most often from the east for 3.7 months, from August 11 to December 3, with a peak percentage of 46% on September 8. The wind is most often from the west for 8.3 months, from December 3 to August 11, with a peak percentage of 32% on January 1.

Wind Direction

Wind Direction in Union CityWEWJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%westsoutheastnorth
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).

Best Time of Year to Visit

To characterize how pleasant the weather is in Union City 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 Union City for general outdoor tourist activities are from early May to mid June and from late August to mid October, with a peak score in the third week of September.

Tourism Score

Tourism Score in Union Citybest timeJanFebMarAprMayJunJulAugSepOctNovDec02468106.76.71.21.26.46.45.25.2 precipitationprecipitationcloudscloudstemperaturetemperaturetourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

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 Union City for hot-weather activities is from mid June to mid September, with a peak score in the third week of August.

Beach/Pool Score

Beach/Pool Score in Union Citybest timeJanFebMarAprMayJunJulAugSepOctNovDec02468106.56.50.10.1 precipitationprecipitationcloudscloudstemperaturetemperaturebeach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

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.

Growing Season

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 Union City typically lasts for 8.0 months (245 days), from around March 18 to around November 19, rarely starting before February 19 or after April 10, and rarely ending before November 1 or after December 12.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season in Union Citygrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Mar 1850%Mar 1850%Nov 1950%Nov 1990%Apr 1090%Apr 1090%Nov 190%Nov 110%Feb 1910%Feb 1910%Dec 1210%Dec 120%Jan 160%Jan 16Jul 27100%Jul 27100%very coldcoldcoolcomfortablewarmhot
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.

Based on growing degree days alone, the first spring blooms in Union City should appear around February 10, only rarely appearing before January 23 or after March 1.

Growing Degree Days

The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 4.5 months, from April 11 to August 27, with an average daily incident shortwave energy per square meter above 5.9 kWh. The brightest day of the year is May 20, with an average of 6.7 kWh.

The darker period of the year lasts for 2.7 months, from November 13 to February 4, with an average daily incident shortwave energy per square meter below 3.4 kWh. The darkest day of the year is December 23, with an average of 2.6 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in Union CitybrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWhMay 206.7 kWhMay 206.7 kWhDec 232.6 kWhDec 232.6 kWhApr 115.9 kWhApr 115.9 kWhAug 275.9 kWhAug 275.9 kWhFeb 43.4 kWhFeb 43.4 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.

Topography

For the purposes of this report, the geographical coordinates of Union City are 33.587 deg latitude, -84.542 deg longitude, and 942 ft elevation.

The topography within 2 miles of Union City contains only modest variations in elevation, with a maximum elevation change of 190 feet and an average elevation above sea level of 955 feet. Within 10 miles also contains only modest variations in elevation (335 feet). Within 50 miles contains only modest variations in elevation (1,473 feet).

The area within 2 miles of Union City is covered by artificial surfaces (87%) and trees (10%), within 10 miles by artificial surfaces (53%) and trees (43%), and within 50 miles by trees (59%) and artificial surfaces (25%).

Data Sources

This report illustrates the typical weather in Union City, 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 Union City.

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

The stations contributing to this reconstruction are: Hartsfield-Jackson Atlanta International Airport (75%, 10 kilometers, northeast); Atlanta Regional Airport (19%, 26 kilometers, south); and West Georgia Regional Airport - O V Gray Field (6%, 57 kilometers, west).

Other Data

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.

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.