This report describes the typical weather at the Portela Airport (Lisbon Airport) (Lisbon, Portugal) weather station over the course of an average November. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Lisbon has a mediterranean climate with dry hot summers and mild winters. The area within 25 mi of this station is covered by shrublands (35%), croplands (31%), oceans and seas (30%), and built-up areas (3%).
The month of November is characterized by falling daily high temperatures, with daily highs decreasing from 68°F to 60°F over the course of the month, exceeding 73°F or dropping below 55°F only one day in ten.
Over the course of November, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 53 minutes, implying an average day-over-day decrease of 1.8 minutes.
The shortest day of the month is November 30 with 9:40 hours of daylight; the longest day is November 1 with 10:32 hours of daylight.
The earliest sunrise is at 7:04am on November 1; the latest sunset is at 5:36pm on November 1; the latest sunrise is at 7:36am on November 30; the earliest sunset is at 5:15pm on November 30.
Daylight savings time is observed in 2012 but it neither starts nor ends in November, so the entire month is in standard time.
The median cloud cover ranges from 52% (partly cloudy) to 60% (partly cloudy). The trend is for the sky to be becoming cloudier with the median cloud cover increasing by 7% from the start to the end of the month.
On November 15, a representative day, the sky is clear or mostly clear 29% of the time, partly cloudy 21% of the time, and mostly cloudy or overcast 26% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around November 30, occurring in 49% of days. Precipitation is least likely around November 1, occurring in 44% of days.
Throughout November, the most common forms of precipitation are moderate rain, light rain, thunderstorms, and drizzle.
Moderate rain is the most severe precipitation observed during 49% of those days with precipitation. It is most likely around November 28, when it is observed during 24% of all days.
Light rain is the most severe precipitation observed during 22% of those days with precipitation. It is most likely around November 30, when it is observed during 11% of all days.
Thunderstorms are the most severe precipitation observed during 13% of those days with precipitation. They are most likely around November 5, when it is observed during 7% of all days.
Drizzle is the most severe precipitation observed during 10% of those days with precipitation. It is most likely around November 30, when it is observed during 5% of all days.
Either snow is exceptionally unlikely to fall at this location in November or this station does not reliably report precipitation types.
The relative humidity typically ranges from 63% (mildly humid) to 95% (very humid) over the course of a typical November, rarely dropping below 44% (comfortable) and reaching as high as 100% (very humid).
The air is driest around November 1, at which time the relative humidity drops below 73% (humid) three days out of four; it is most humid around November 29, rising above 92% (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 November, the dew point typically varies from 45°F (dry) to 58°F (comfortable) and is rarely below 37°F (dry) or above 65°F (mildy humid).
The time of the month between November 1 and November 30 is the most comfortable, with dew points that are neither too dry nor too muggy.
Over the course of November typical wind speeds vary from 1 mph to 13 mph (light air to moderate breeze), rarely exceeding 21 mph (fresh breeze).
The highest average wind speed of 8 mph (gentle breeze) occurs around November 1, 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 November 26, at which time the average daily maximum wind speed is 13 mph (moderate breeze).