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Average Weather On November 15 For London, United Kingdom

Location

This report describes the typical weather at the London Heathrow Airport (London, United Kingdom) weather station over the course of an average November 15. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.

London has a mild humid temperate climate with warm summers and no dry season. The area within 25 mi of this station is covered by croplands (60%), built-up areas (35%), and grasslands (4%).

Temperature

The temperature typically varies from 44°F to 50°F and is rarely below 35°F or above 57°F.

Temperature

Average hourly temperature (black) with percentil bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).

The coolest hours of the day are from midnight to 9am with the coldest at 5am, at which time the temperature is below 49°F three days out of four.

The warmest hours of the day are from 11am to 4pm with the hottest at 2pm, at which time the temperature is above 47°F three days out of four.

The day has gained half its heat by 11am and lost it again by 7pm.

Temperature Bands

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).
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February 2017
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March 2017
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April 2017
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May 2017
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June 2017
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July 2017
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August 2017
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September 2017
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October 2017
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November 2017
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December 2017
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January 2018
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Sun

On November 15 the Sun rises at 7:20am and sets at 4:12pm.

Solar noon is at 11:46am.

For reference, on the longest day of the year the Sun rises at 4:44am and sets at 9:23pm, while on the shortest day of the year it rises at 8:05am and sets at 3:55pm.

Astronomical twilight begins and ends 117 minutes before sunrise and after sunset at 5:23am and 6:08pm, respectively.

Nautical twilight begins and ends 78 minutes before sunrise and after sunset at 6:02am and 5:29pm, respectively.

Civil twilight begins and ends 36 minutes before sunrise and after sunset at 6:44am and 4:48pm, respectively.

Solar twilight begins and ends 53 minutes after sunrise and before sunset at 8:13am and 3:18pm, respectively.

Solar Elevation

Elevation of the Sun above (positive) or below (negative) the horizon (black line). Yellow and gray fills indicate day and night, respectively. Light gray lines are the corresponding curves for the winter and summer equinoxes.

Clouds

The median cloud cover is 87% (mostly cloudy) and does not vary substantially over the course of the day.

On average, the sky is clear or mostly clear 24% of the time, partly cloudy 15% of the time, and mostly cloudy or overcast 56% of the time.

Median Cloud Cover

Median hourly cloud coverage fraction (black line) with percentile bands (inner band from 40th to 60th percentile, outer band from 25th to 75th percentile).

Cloud Cover Types

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 the United States clear skies are often reported ambiguously, leading them to be lumped in with the missing data.

Precipitation

There is a 70% chance that precipitation will be observed at some point during the day.

Probability of Precipitation

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.

When precipitation does occur it is most often in the form of moderate rain (71% of days with precipitation have at worst moderate rain), slight rain (9%), drizzle (8%), and heavy rain (7%).

Precipitation is observed with more or less equal probability throughout the day.

Types of Precipitation

Relative frequency of various types of precipitation over the course of a typical November 15.

Snow

Either snow is exceptionally unlikely to fall at this location on November 15 or this station does not reliably report precipitation types.

Humidity

The relative humidity typically ranges from 76% (humid) to 90% (very humid), rarely dropping below 62% (mildly humid), or exceeding 98% (very humid).

The air is driest at 2pm, at which time the relative humidity is less than 84% (humid) three days out of four; it is most humid at 5am, exceeding 86% (very humid) three days out of four.

Relative Humidity

Average hourly humidity (black line) with percentile bands (inner bands from 25th to 75th percentile, outer bands from 10th to 90th percentile).

Dew Point

The dew point ranges from 41°F to 43°F with an average of 42°F.

For reference, comfortable indoor conditions should have a relative humidity between 30% and 50% with a dew point of less than 65°F.

Dew Point

Average hourly dew point (black line) with percentile bands (inner bands from 25th to 75th percentile, outer bands from 10th to 90th percentile).

Wind

The wind speed is 8 mph (gentle breeze) on average and is rarely outside the range 3 mph to 15 mph (light air to moderate breeze). The wind speed does not vary substantially during the course of the day.

Wind Speed

Average hourly wind speed (black line) with percentile bands (inner bands from 25th to 75th percentile, outer bands from 10th to 90th percentile).

The wind is most often out of the south west (21% of the time), west (19% of the time), south (18% of the time), and north (10% of the time).

Wind Directions

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

Wind Directions Over Day

The fraction of time spent with the wind blowing from the various directions on an hourly basis. Values do not sum to 100% because the wind direction is undefined when the wind speed is zero.