How warm is Georgia in April?

Daily high temperatures increase by 4°C, from 21°C to 24°C, rarely falling below 14°C or exceeding 29°C.

Daily low temperatures increase by 4°C, from 9°C to 13°C, rarely falling below 3°C or exceeding 18°C.

For reference, on 22 July, the hottest day of the year, temperatures in Atlanta typically range from 22°C to 32°C, while on 23 January, the coldest day of the year, they range from 2°C to 12°C.

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 in Atlanta

Average Hourly Temperature in April in AtlantaApr. 11223344556677 889910101111121213131414151516161717181819192020212122222323242425252626 272728282929303012 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 amMar.Mayvery coldcoldcoldcool comfortablecomfortablewarm

frigid -9°C freezing 0°C very cold 7°C cold 13°C cool 18°C comfortable 24°C warm 29°C hot 35°C sweltering

The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Baiyun, China (12,941 kilometres away) is the far-away foreign place with temperatures most similar to Atlanta (view comparison).

Compare Atlanta to another city:

Clouds

The month of April in Atlanta experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 46% to 41%.

The clearest day of the month is 30 April, with clear, mostly clear, or partly cloudy conditions 59% of the time.

For reference, on 3 January, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 54%, while on 15 October, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 67%.

Precipitation

A wet day is one with at least 1 millimetre of liquid or liquid-equivalent precipitation. In Atlanta, the chance of a wet day over the course of April is essentially constant, remaining around 30% throughout.

For reference, the year's highest daily chance of a wet day is 45% on 9 July, and its lowest chance is 19% on 29 October.

Rainfall

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 Atlanta is decreasing, starting the month at 102 millimetres, when it rarely exceeds 178 millimetres or falls below 37 millimetres, and ending the month at 84 millimetres, when it rarely exceeds 150 millimetres or falls below 31 millimetres.

Sun

Over the course of April in Atlanta, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 57 minutes, implying an average daily increase of 1 minute, 58 seconds, and weekly increase of 13 minutes, 48 seconds.

The shortest day of the month is 1 April, with 12 hours, 33 minutes of daylight and the longest day is 30 April, with 13 hours, 30 minutes of daylight.

The latest sunrise of the month in Atlanta is 7:24 am on 1 April and the earliest sunrise is 35 minutes earlier at 6:49 am on 30 April.

The earliest sunset is 7:58 pm on 1 April and the latest sunset is 22 minutes later at 8:20 pm on 30 April.

Daylight saving time is observed in Atlanta during 2022, but it neither starts nor ends during April, so the entire month is in daylight saving time.

For reference, on 21 June, the longest day of the year, the Sun rises at 6:27 am and sets 14 hours, 24 minutes later, at 8:51 pm, while on 21 December, the shortest day of the year, it rises at 7:38 am and sets 9 hours, 55 minutes later, at 5:33 pm.

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 April in Atlanta

Solar Elevation and Azimuth in April in Atlanta Apr. 6677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 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 amMar.May001010202020303040405050506060700001010202030303040405050606070

northeastsouthwest

Solar elevation and azimuth over the course of April 2022. 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).

Moon

The figure below presents a compact representation of key lunar data for April 2022. 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.

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.

The chance that a given day will be muggy in Atlanta is gradually increasing during April, rising from 1% to 5% over the course of the month.

For reference, on 25 July, the muggiest day of the year, there are muggy conditions 86% of the time, while on 23 January, the least muggy day of the year, there are muggy conditions 0% of the time.

Wind

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 metres 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 Atlanta is gradually decreasing during April, decreasing from 11.1 kilometres per hour to 9.8 kilometres per hour over the course of the month.

For reference, on 8 March, the windiest day of the year, the daily average wind speed is 11.6 kilometres per hour, while on 5 August, the calmest day of the year, the daily average wind speed is 6.9 kilometres per hour.

The hourly average wind direction in Atlanta throughout April is predominantly from the west, with a peak proportion of 34% on 15 April.

Wind Direction in April in Atlanta

Wind Direction in April in AtlantaApr.1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%20%80%40%60%60%40%80%20%100%0%Mar.Maywestsoutheastnorth

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 1.6 km/h. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

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 (≥ 0°C) in the year (the calendar year in the Northern Hemisphere, or from 1 July until 30 June in the Southern Hemisphere).

The growing season in Atlanta typically lasts for 8.0 months (243 days), from around 19 March to around 17 November, rarely starting before 24 February or after 8 April, and rarely ending before 31 October or after 6 December.

The month of April in Atlanta is more likely than not fully within the growing season, with the chance that a given day is in the growing season rapidly increasing from 79% to 99% over the course of the month.

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 10°C and a cap of 30°C.

The average accumulated growing degree days in Atlanta are increasing during April, increasing by 203°C, from 207°C to 410°C, over the course of the month.

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 in Atlanta is increasing during April, rising by 1.0 kWh, from 5.5 kWh to 6.5 kWh, over the course of the month.

Topography

For the purposes of this report, the geographical coordinates of Atlanta are 33.749 deg. latitude, -84.388 deg. longitude, and 318 m elevation.

The topography within 3 kilometres of Atlanta contains only modest variations in elevation, with a maximum elevation change of 55 metres and an average elevation above sea level of 303 metres. Within 16 kilometres contains only modest variations in elevation (151 metres). Within 80 kilometres contains significant variations in elevation (614 metres).

The area within 3 kilometres of Atlanta is covered by artificial surfaces (100%), within 16 kilometres by artificial surfaces (83%) and trees (13%), and within 80 kilometres by trees (57%) and artificial surfaces (26%).

Data Sources

This report illustrates the typical weather in Atlanta, based on a statistical analysis of historical hourly weather reports and model reconstructions from 1 January 1980 to 31 December 2016.

Temperature and Dew Point

There are 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Atlanta.

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

The stations contributing to this reconstruction are:

• Fulton County Airport-Brown Field (KFTY, 35%, 13 km, west, -62 m elevation change)
• Hartsfield-Jackson Atlanta International Airport (KATL, 35%, 14 km, south, -11 m elevation change)
• Dekalb-Peachtree Airport (KPDK, 29%, 16 km, northeast, -13 m elevation change)

To get a sense of how much these sources agree with each other, you can view a comparison of Atlanta 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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