This report describes the typical weather at the Nashville International Airport (Nashville, Tennessee, United States) weather station over the course of an average October 4. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Nashville, Tennessee 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 (84%), built-up areas (8%), croplands (4%), and lakes and rivers (3%).
The temperature typically varies from 55°F to 74°F and is rarely below 44°F or above 84°F.
The coolest hours of the day are from 2am to 9am with the coldest at 7am, at which time the temperature is below 62°F three days out of four.
The warmest hours of the day are from noon to 6pm with the hottest at 3pm, at which time the temperature is above 68°F three days out of four.
The day has gained half its heat by 10am and lost it again by 9pm.
On October 4 the Sun rises at 6:45am and sets at 6:25pm.
Solar noon is at 12:35pm.
For reference, on the longest day of the year the Sun rises at 5:29am and sets at 8:07pm, while on the shortest day of the year it rises at 6:53am and sets at 4:36pm.
Astronomical twilight begins and ends 85 minutes before sunrise and after sunset at 5:19am and 7:50pm, respectively.
Nautical twilight begins and ends 55 minutes before sunrise and after sunset at 5:48am and 7:20pm, respectively.
Civil twilight begins and ends 25 minutes before sunrise and after sunset at 6:19am and 6:50pm, respectively.
Solar twilight begins and ends 33 minutes after sunrise and before sunset at 7:18am and 5:51pm, respectively.
The median cloud cover ranges from 32% (mostly clear) to 55% (partly cloudy).
At 1am, the clearest time of the day, the sky is clear, mostly clear, or partly cloudy 68% of the time, and overcast or mostly cloudy 32% of the time.
At noon, the cloudiest time of the day, the sky is overcast, mostly cloudy, or partly cloudy 61% of the time, and clear or mostly clear 39% of the time.
The sky is typically clearing in earnest by 8pm.
The clouds have typically started forming in earnest by 6am.
There is a 30% chance that precipitation will be observed at some point during the day.
The average measured liquid-equivalent quantity of precipitation is 0.089". Among only those days for which there is at least some measured precipitation, the average is 0.369" and the total rarely exceeds 0.819".
When precipitation does occur it is most often in the form of slight rain (40% of days with precipitation have at worst slight rain), thunderstorms (23%), moderate rain (22%), and heavy rain (11%).
Precipitation is most likely around 8am and least likely around midnight.
Either snow is exceptionally unlikely to fall at this location on October 4 or this station does not reliably report precipitation types.
The relative humidity typically ranges from 51% (mildly humid) to 86% (very humid), rarely dropping below 31% (comfortable), or exceeding 96% (very humid).
The air is driest at 3pm, at which time the relative humidity is less than 62% (mildly humid) three days out of four; it is most humid at 6am, exceeding 80% (humid) three days out of four.
The dew point ranges from 51°F to 54°F with an average of 52°F.
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 5 mph to 9 mph (light breeze to gentle breeze) over the course of the day.
The peak sustained wind speed typically occurs around 3pm and is rarely outside the range 4 mph to 14 mph (light breeze to moderate breeze).
The wind is most calm around 5am, rarely exceeding 9 mph (gentle breeze).
The wind is most often out of the south (25% of the time) and north (16% of the time).