This report describes the typical weather at the Hartsfield-Jackson Atlanta International Airport (Atlanta, Georgia, United States) weather station over the course of an average October 26. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Atlanta, Georgia has a warm humid temperate climate with hot summers and no dry season. The area within 25 mi of this station is covered by croplands (47%), forests (29%), and built-up areas (23%).
The temperature typically varies from 52Â°F to 68Â°F and is rarely below 41Â°F or above 78Â°F.
The coolest hours of the day are from 2am to 9am with the coldest at 7am, at which time the temperature is below 59Â°F three days out of four.
The warmest hours of the day are from 1pm to 6pm with the hottest at 4pm, at which time the temperature is above 63Â°F three days out of four.
The day has gained half its heat by 11am and lost it again by 9pm.
On October 26 the Sun rises at 7:51am and sets at 6:50pm.
Solar noon is at 1:21pm.
For reference, on the longest day of the year the Sun rises at 6:27am and sets at 8:51pm, while on the shortest day of the year it rises at 7:38am and sets at 5:33pm.
Astronomical twilight begins and ends 84 minutes before sunrise and after sunset at 6:28am and 8:14pm, respectively.
Nautical twilight begins and ends 54 minutes before sunrise and after sunset at 6:56am and 7:45pm, respectively.
Civil twilight begins and ends 25 minutes before sunrise and after sunset at 7:26am and 7:15pm, respectively.
Solar twilight begins and ends 34 minutes after sunrise and before sunset at 8:26am and 6:16pm, respectively.
The median cloud cover ranges from 35% (mostly clear) to 61% (partly cloudy).
At midnight, the clearest time of the day, the sky is clear, mostly clear, or partly cloudy 63% of the time, and overcast or mostly cloudy 36% of the time.
At noon, the cloudiest time of the day, the sky is overcast, mostly cloudy, or partly cloudy 58% of the time, and clear or mostly clear 41% of the time.
The sky is typically clearing in earnest by 7pm.
The clouds have typically started forming in earnest by 7am.
There is a 33% chance that precipitation will be observed at some point during the day.
The average measured liquid-equivalent quantity of precipitation is 0.088". Among only those days for which there is at least some measured precipitation, the average is 0.365" and the total rarely exceeds 0.827".
When precipitation does occur it is most often in the form of moderate rain (37% of days with precipitation have at worst moderate rain), slight rain (33%), heavy rain (12%), thunderstorms (12%), and drizzle (6%).
Precipitation is most likely around 8am and least likely around 9pm.
Either snow is exceptionally unlikely to fall at this location on October 26 or this station does not reliably report precipitation types.
The relative humidity typically ranges from 53% (mildly humid) to 82% (humid), rarely dropping below 30% (dry), or exceeding 97% (very humid).
The air is driest at 4pm, at which time the relative humidity is less than 66% (mildly humid) three days out of four; it is most humid at 6am, exceeding 73% (humid) three days out of four.
The dew point ranges from 47Â°F to 48Â°F with an average of 48Â°F.
For reference, comfortable indoor conditions should have a relative humidity between 30% and 50% with a dew point of less than 65Â°F.
The wind speed is 8 mph (gentle breeze) on average and is rarely outside the range 3 mph to 13 mph (light air to moderate breeze). The wind speed does not vary substantially during the course of the day.
The wind is most often out of the east (24% of the time), north west (23% of the time), and west (12% of the time).