Average Weather In October For Bar Harbor, Maine, USA

Location

This report describes the typical weather at the Hancock County-Bar Harbor Airport (Bar Harbor, Maine, United States) weather station over the course of an average October. It is based on the historical records from 1992 to 2012. Earlier records are either unavailable or unreliable.

Bar Harbor, Maine has a humid continental climate with warm summers and no dry season. The area within 25 mi of this station is covered by forests (60%), oceans and seas (33%), and lakes and rivers (6%).

Temperature

The month of October is characterized by rapidly falling daily high temperatures, with daily highs decreasing from 61°F to 50°F over the course of the month, exceeding 68°F or dropping below 42°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 37°F to 46°F, falling below 28°F or exceeding 54°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 decreasing. From the start to the end of the month, the length of the day decreases by 1:28 hours, implying an average day-over-day decrease of 2.9 minutes.

The shortest day of the month is October 31 with 10:13 hours of daylight; the longest day is October 1 with 11:42 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 6:31am on October 1; the latest sunset is at 6:13pm on October 1; the latest sunrise is at 7:10am on October 31; the earliest sunset is at 5:24pm on October 31.

Daylight saving 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 Saving 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 saving time are indicated by the "DST" labels.

Clouds

The median cloud cover ranges from 47% (partly cloudy) to 63% (partly cloudy). The trend is for the sky to be becoming rapidly cloudier with the median cloud cover increasing by 16% from the start to the end 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 1, the clearest day of the month, the sky is clear, mostly clear, or partly cloudy 48% of the time, and overcast or mostly cloudy 41% of the time.

On October 31, the cloudiest day of the month, the sky is overcast, mostly cloudy, or partly cloudy 48% of the time, and clear or mostly clear 38% 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 1%, 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.

Thunderstorms are the most severe precipitation observed during 100% of those days with precipitation. They are most likely around October 1, when it is observed during 2% 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 53% (mildly humid) to 91% (very humid) over the course of a typical October, rarely dropping below 35% (comfortable) and reaching as high as 100% (very humid).

The air is driest around October 21, at which time the relative humidity drops below 65% (mildly humid) three days out of four; it is most humid around October 1, rising above 87% (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 28°F (dry) to 51°F (very comfortable) and is rarely below 18°F (dry) or above 59°F (comfortable).

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 13 mph (calm to moderate breeze), rarely exceeding 23 mph (fresh breeze).

The highest average wind speed of 8 mph (light breeze) occurs around October 31, at which time the average daily maximum wind speed is 13 mph (moderate breeze).

The lowest average wind speed of 7 mph (light breeze) occurs around October 4, at which time the average daily maximum wind speed is 13 mph (moderate 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 west (17% of the time), north (17% of the time), north west (13% of the time), and south (12% of the time). The wind is least often out of the 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.