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 February 22. 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 42°F to 57°F and is rarely below 30°F or above 70°F.
The coolest hours of the day are from 2am to 9am with the coldest at 7am, at which time the temperature is below 49°F three days out of four.
The warmest hours of the day are from 1pm to 7pm with the hottest at 4pm, at which time the temperature is above 50°F three days out of four.
The day has gained half its heat by 11am and lost it again by 10pm.
On February 22 the Sun rises at 7:15am and sets at 6:28pm.
Solar noon is at 12:51pm.
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 82 minutes before sunrise and after sunset at 5:52am and 7:50pm, respectively.
Nautical twilight begins and ends 54 minutes before sunrise and after sunset at 6:20am and 7:22pm, respectively.
Civil twilight begins and ends 25 minutes before sunrise and after sunset at 6:49am and 6:53pm, respectively.
Solar twilight begins and ends 34 minutes after sunrise and before sunset at 7:48am and 5:53pm, respectively.
The median cloud cover ranges from 64% (partly cloudy) to 81% (mostly cloudy).
At 11pm, the clearest time of the day, the sky is clear, mostly clear, or partly cloudy 53% of the time, and overcast or mostly cloudy 45% of the time.
At 11am, the cloudiest time of the day, the sky is overcast, mostly cloudy, or partly cloudy 67% of the time, and clear or mostly clear 32% of the time.
The sky is typically clearing in earnest by 7pm.
The clouds have typically started forming in earnest by 5am.
There is a 44% chance that precipitation will be observed at some point during the day.
The average measured liquid-equivalent quantity of precipitation is 0.137". Among only those days for which there is at least some measured precipitation, the average is 0.389" and the total rarely exceeds 0.919".
When precipitation does occur it is most often in the form of slight rain (31% of days with precipitation have at worst slight rain), moderate rain (30%), thunderstorms (15%), heavy rain (7%), slight snow (6%), and drizzle (5%).
Precipitation is most likely around 7am and least likely around 4pm.
Either snow is exceptionally unlikely to fall at this location on February 22 or this station does not reliably report precipitation types.
The relative humidity typically ranges from 49% (comfortable) to 75% (humid), rarely dropping below 25% (dry), or exceeding 96% (very humid).
The air is driest at 4pm, at which time the relative humidity is less than 65% (mildly humid) three days out of four; it is most humid at 6am, exceeding 63% (mildly humid) three days out of four.
The dew point ranges from 34°F to 36°F with an average of 35°F.
For reference, comfortable indoor conditions should have a relative humidity between 30% and 50% with a dew point of less than 65°F.
The wind speed is 10 mph (gentle breeze) on average and is rarely outside the range 4 mph to 16 mph (light breeze to moderate breeze). The wind speed does not vary substantially during the course of the day.
The wind is most often out of the north west (26% of the time), west (15% of the time), east (15% of the time), and south west (10% of the time). The wind is least often out of the north east (4% of the time).