This report describes the typical weather at the Nashville International Airport (Nashville, Tennessee, United States) weather station over the course of an average October. 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 month of October is characterized by rapidly falling daily high temperatures, with daily highs decreasing from 76°F to 66°F over the course of the month, exceeding 85°F or dropping below 54°F only one day in ten.
Over the course of October, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 1:06 hours, implying an average day-over-day decrease of 2.1 minutes.
The shortest day of the month is October 31 with 10:42 hours of daylight; the longest day is October 1 with 11:48 hours of daylight.
The earliest sunrise is at 6:42am on October 1; the latest sunset is at 6:30pm on October 1; the latest sunrise is at 7:09am on October 31; the earliest sunset is at 5:51pm on October 31.
Daylight savings time is observed in 2012 but it neither starts nor ends in October, so the entire month is in daylight time.
The median cloud cover ranges from 45% (partly cloudy) to 55% (partly cloudy). The trend is for the sky to be becoming cloudier with the median cloud cover increasing by 10% from the start to the end of the month.
On October 4, the clearest day of the month, the sky is clear, mostly clear, or partly cloudy 65% of the time, and overcast or mostly cloudy 35% of the time.
On October 31, the cloudiest day of the month, the sky is overcast, mostly cloudy, or partly cloudy 57% of the time, and clear or mostly clear 43% of the time.
The average probability that some form of precipitation will be observed in a given day is 31%, with little variation over the course of the month.
Throughout October, the most common forms of precipitation are light rain, moderate rain, thunderstorms, and heavy rain.
Light rain is the most severe precipitation observed during 41% of those days with precipitation. It is most likely around October 31, when it is observed during 15% of all days.
Moderate rain is the most severe precipitation observed during 23% of those days with precipitation. It is most likely around October 30, when it is observed during 8% of all days.
Thunderstorms are the most severe precipitation observed during 19% of those days with precipitation. They are most likely around October 1, when it is observed during 8% of all days.
Heavy rain is the most severe precipitation observed during 11% of those days with precipitation. It is most likely around October 21, when it is observed during 4% of all days.
Either snow is exceptionally unlikely to fall at this location in October or this station does not reliably report precipitation types.
The relative humidity typically ranges from 45% (comfortable) to 91% (very humid) over the course of a typical October, rarely dropping below 26% (dry) and reaching as high as 99% (very humid).
The air is driest around October 8, at which time the relative humidity drops below 52% (mildly humid) three days out of four; it is most humid around October 1, rising above 87% (very humid) three days out of four.
Dew point is often a better measure of how comfortable a person will find the weather than relative humidity because it more directly relates to whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid.
Over the course of a typical October, the dew point typically varies from 38°F (dry) to 58°F (comfortable) and is rarely below 24°F (dry) or above 69°F (muggy).
The time of the month between October 1 and October 29 is the most comfortable, with dew points that are neither too dry nor too muggy.
Over the course of October typical wind speeds vary from 0 mph to 12 mph (calm to moderate breeze), rarely exceeding 19 mph (fresh breeze).
The highest average wind speed of 7 mph (light breeze) occurs around October 31, at which time the average daily maximum wind speed is 12 mph (moderate breeze).
The lowest average wind speed of 6 mph (light breeze) occurs around October 4, at which time the average daily maximum wind speed is 12 mph (gentle breeze).