Average Weather In October For Hilton Head Island, South Carolina, USA

Location

This report describes the typical weather at the Hilton Head Airport (Hilton Head Island, South Carolina, United States) weather station over the course of an average October. It is based on the historical records from 2005 to 2012. Earlier records are either unavailable or unreliable.

Hilton Head Island, South Carolina has a warm humid temperate climate with hot summers and no dry season. The area within 25 mi of this station is covered by oceans and seas (54%), forests (29%), croplands (8%), lakes and rivers (6%), and grasslands (3%).

Temperature

The month of October is characterized by rapidly falling daily high temperatures, with daily highs decreasing from 81°F to 71°F over the course of the month, exceeding 85°F or dropping below 63°F only one day in ten.

Daily High and Low Temperature in October

The daily average low (blue) and high (red) temperature with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).
Daily low temperatures range from 55°F to 68°F, falling below 47°F or exceeding 73°F only one day in ten.

Fraction of Time Spent in Various Temperature Bands in October

The average fraction of time spent in various temperature bands: frigid (below 15°F), freezing (15°F to 32°F), cold (32°F to 50°F), cool (50°F to 65°F), comfortable (65°F to 75°F), warm (75°F to 85°F), hot (85°F to 100°F) and sweltering (above 100°F).

Sun

Over the course of October, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 55 minutes, implying an average day-over-day decrease of 1.8 minutes.

The shortest day of the month is October 31 with 10:54 hours of daylight; the longest day is October 1 with 11:49 hours of daylight.

Daily Hours of Daylight and Twilight in October

The number of hours during which the Sun is visible (black line), with various degrees of daylight, twilight, and night, indicated by the color bands. From bottom (most yellow) to top (most gray): full daylight, solar twilight (Sun is visible but less than 6° from the horizon), civil twilight (Sun is not visible but is less than 6° below the horizon), nautical twilight (Sun is between 6° and 12° below the horizon), astronomical twilight (Sun is between 12° and 18° below the horizon), and full night.

The earliest sunrise is at 7:17am on October 1; the latest sunset is at 7:07pm on October 1; the latest sunrise is at 7:39am on October 31; the earliest sunset is at 6:33pm 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.

Daily Sunrise & Sunset with Twilight and Daylight Savings Time in October

The solar day over the course of the year 2012 . From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (solar, civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight savings time are indicated by the "DST" labels.

Clouds

The median cloud cover is 23% (mostly clear) and does not vary substantially over the course of the month.

Median Cloud Cover in October

The median daily cloud cover (black line) with percentile bands (inner band from 40th to 60th percentile, outer band from 25th to 75th percentile).

On October 16, a representative day, the sky is clear or mostly clear 47% of the time, partly cloudy 8% of the time, and mostly cloudy or overcast 21% of the time.

Cloud Cover Types in October

The fraction of time spent in each of the five sky cover categories. From top (most blue) to bottom (most gray), the categories are clear, mostly clear, partly cloudy, mostly cloudy, and overcast. Pink indicates missing data. Outside of the United States clear skies are often reported ambiguously, leading them to be lumped in with the missing data.

Precipitation

The average probability that some form of precipitation will be observed in a given day is 20%, with little variation over the course of the month.

Probability of Precipitation at Some Point in the Day in October

The fraction of days in which various types of precipitation are observed. If more than one type of precipitation is reported in a given day, the more severe precipitation is counted. For example, if light rain is observed in the same day as a thunderstorm, that day counts towards the thunderstorm totals. The order of severity is from the top down in this graph, with the most severe at the bottom.

Throughout October, the most common forms of precipitation are thunderstorms, heavy rain, light rain, moderate rain, and drizzle.

Thunderstorms are the most severe precipitation observed during 28% of those days with precipitation. They are most likely around October 1, when it is observed during 7% of all days.

Heavy rain is the most severe precipitation observed during 23% of those days with precipitation. It is most likely around October 26, when it is observed during 5% of all days.

Light rain is the most severe precipitation observed during 17% of those days with precipitation. It is most likely around October 31, when it is observed during 4% of all days.

Moderate rain is the most severe precipitation observed during 16% of those days with precipitation. It is most likely around October 31, when it is observed during 4% of all days.

Drizzle is the most severe precipitation observed during 16% of those days with precipitation. It is most likely around October 22, when it is observed during 4% of all days.

Types of Precipitation Throughout October

Relative frequency of various types of precipitation over the course of a typical October.

Snow

Either snow is exceptionally unlikely to fall at this location in October or this station does not reliably report precipitation types.

Humidity

The relative humidity typically ranges from 54% (mildly humid) to 96% (very humid) over the course of a typical October, rarely dropping below 38% (comfortable) and reaching as high as 100% (very humid).

The air is driest around October 30, at which time the relative humidity drops below 64% (mildly humid) three days out of four; it is most humid around October 12, rising above 95% (very humid) three days out of four.

Relative Humidity in October

The average daily high (blue) and low (brown) relative humidity with percentile bands (inner bands from 25th to 75th percentile, outer bands from 10th to 90th percentile).

Dew Point

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 49°F (dry) to 71°F (very muggy) and is rarely below 37°F (dry) or above 76°F (oppressive).

Dew Point in October

The daily average low (blue) and high (red) dew point with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).

Wind

Over the course of October typical wind speeds vary from 0 mph to 11 mph (calm to gentle breeze), rarely exceeding 17 mph (moderate breeze).

The highest average wind speed of 6 mph (light breeze) occurs around October 28, at which time the average daily maximum wind speed is 11 mph (gentle breeze).

The lowest average wind speed of 6 mph (light breeze) occurs around October 17, at which time the average daily maximum wind speed is 10 mph (gentle breeze).

Wind Speed in October

The average daily minimum (red), maximum (green), and average (black) wind speed with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).
The wind is most often out of the south (13% of the time). The wind is least often out of the north west (3% of the time) and south east (4% of the time).

Wind Directions in October

The fraction of time spent with the wind blowing from the various directions over the entire year. Values do not sum to 100% because the wind direction is undefined when the wind speed is zero.

Fraction of Time Spent with Various Wind Directions in October

The fraction of time spent with the wind blowing from the various directions on a daily basis. Stacked values do not always sum to 100% because the wind direction is undefined when the wind speed is zero.