This report describes the typical weather at the Anniston Metropolitan Airport (Anniston, Alabama, United States) weather station over the course of an average June 21. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Anniston, Alabama has a warm humid temperate climate with hot summers and no dry season. The area within 25 mi of this station is covered by forests (83%), croplands (13%), and lakes and rivers (3%).
The temperature typically varies from 68°F to 86°F and is rarely below 62°F or above 93°F.
The coolest hours of the day are from midnight to 8am with the coldest at 6am, at which time the temperature is below 71°F three days out of four.
The warmest hours of the day are from 11am to 7pm with the hottest at 3pm, at which time the temperature is above 83°F three days out of four.
The day has gained half its heat by 10am and lost it again by 9pm.
On June 21 the Sun rises at 5:33am and sets at 7:57pm.
Solar noon is at 12:45pm.
For reference, on the longest day of the year the Sun rises at 5:33am and sets at 7:56pm, while on the shortest day of the year it rises at 6:43am and sets at 4:40pm.
Astronomical twilight begins and ends 104 minutes before sunrise and after sunset at 3:49am and 9:41pm, respectively.
Nautical twilight begins and ends 64 minutes before sunrise and after sunset at 4:28am and 9:01pm, respectively.
Civil twilight begins and ends 28 minutes before sunrise and after sunset at 5:04am and 8:25pm, respectively.
Solar twilight begins and ends 36 minutes after sunrise and before sunset at 6:10am and 7:20pm, respectively.
The median cloud cover ranges from 17% (mostly clear) to 52% (partly cloudy).
At 1am, the clearest time of the day, the sky is clear, mostly clear, or partly cloudy 67% of the time, and overcast or mostly cloudy 30% of the time.
At 1pm, the cloudiest time of the day, the sky is overcast, mostly cloudy, or partly cloudy 51% of the time, and clear or mostly clear 48% of the time.
The sky is typically clearing in earnest by 8pm.
The clouds have typically started forming in earnest by 7am.
There is a 47% chance that precipitation will be observed at some point during the day.
The average measured liquid-equivalent quantity of precipitation is 0.039". Among only those days for which there is at least some measured precipitation, the average is 0.242" and the total rarely exceeds 0.539".
When precipitation does occur it is most often in the form of thunderstorms (69% of days with precipitation have at worst thunderstorms), slight rain (15%), and moderate rain (14%).
Precipitation is most likely around 5pm and least likely around 3am.
Either snow is exceptionally unlikely to fall at this location on June 21 or this station does not reliably report precipitation types.
The relative humidity typically ranges from 56% (mildly humid) to 92% (very humid), rarely dropping below 38% (comfortable), or exceeding 99% (very humid).
The air is driest at 3pm, at which time the relative humidity is less than 65% (mildly humid) three days out of four; it is most humid at 4am, exceeding 89% (very humid) three days out of four.
The dew point ranges from 66°F to 69°F with an average of 67°F, which feels muggy no matter what the relative humidity is.
For reference, comfortable indoor conditions should have a relative humidity between 30% and 50% with a dew point of less than 65°F.
Sustained wind speeds typically vary from 2 mph to 7 mph (light air to light breeze) over the course of the day.
The peak sustained wind speed typically occurs around 2pm and is rarely outside the range 3 mph to 11 mph (light air to gentle breeze).
The wind is most calm around midnight, rarely exceeding 6 mph (light breeze).
The wind is most often out of the east (14% of the time), south west (13% of the time), and west (12% of the time). The wind is least often out of the south east (3% of the time), north west (4% of the time), south (4% of the time), and north (5% of the time).