This report describes the typical weather at the Bangor International Airport (Bangor, Maine, 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.
Bangor, 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 (93%) and lakes and rivers (5%).
The month of October is characterized by rapidly falling daily high temperatures, with daily highs decreasing from 63°F to 52°F over the course of the month, exceeding 71°F or dropping below 42°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 1:29 hours, implying an average day-over-day decrease of 2.9 minutes.
The shortest day of the month is October 31 with 10:12 hours of daylight; the longest day is October 1 with 11:42 hours of daylight.
The earliest sunrise is at 6:33am on October 1; the latest sunset is at 6:15pm on October 1; the latest sunrise is at 7:12am on October 31; the earliest sunset is at 5:25pm 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 75% (partly cloudy) to 86% (mostly cloudy). The trend is for the sky to be becoming cloudier with the median cloud cover increasing by 11% from the start to the end of the month.
On October 1, the clearest day of the month, the sky is clear, mostly clear, or partly cloudy 47% of the time, and overcast or mostly cloudy 52% of the time.
On October 31, the cloudiest day of the month, the sky is overcast, mostly cloudy, or partly cloudy 69% of the time, and clear or mostly clear 31% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around October 31, occurring in 48% of days. Precipitation is least likely around October 1, occurring in 42% of days.
Throughout October, the most common forms of precipitation are light rain and moderate rain.
Light rain is the most severe precipitation observed during 55% of those days with precipitation. It is most likely around October 10, when it is observed during 26% of all days.
Moderate rain is the most severe precipitation observed during 21% of those days with precipitation. It is most likely around October 16, when it is observed during 10% of all days.
The likelihood of snow falling is highest around October 31, occurring in 9% of days.
Accumulation at this location in October is extremely unlikely. The chances of there being snow on the ground are highest around October 7, occurring 3% of the time.
The snow is typically at its deepest on October 8, with a median depth of 1.6"; the depth exceeds 1.9" only one year out of ten.
The relative humidity typically ranges from 50% (mildly humid) to 92% (very humid) over the course of a typical October, rarely dropping below 32% (comfortable) and reaching as high as 100% (very humid).
The air is driest around October 21, at which time the relative humidity drops below 60% (mildly humid) three days out of four; it is most humid around October 1, rising above 89% (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 28°F (dry) to 51°F (very comfortable) and is rarely below 17°F (dry) or above 61°F (comfortable).
Over the course of October typical wind speeds vary from 0 mph to 15 mph (calm to moderate breeze), rarely exceeding 23 mph (fresh breeze).
The highest average wind speed of 8 mph (gentle breeze) occurs around October 30, at which time the average daily maximum wind speed is 15 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 14 mph (moderate breeze).