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Weather in South London during November 2015
Exceptionally mild and unusually windy.
Temperatures

The average maximum temperature during November 2015 was 13.1 Celsius (55F), and that was 2.0 Celsius (3.5F) above normal for the month. The average minimum temperature was 8.2 Celsius (46F), and that was 3.0 Celsius (5.4F) above  the monthly normal. Only the November of 1994 has been milder since 1900, although the November of 2011 was equally as mild. Even though it has been an exceptionally mild month, it is only the second month this year to have achieved above average temperatures; the other month was April.  

The highest temperature recorded in November was 17.4 Celsius (63F) on the 6th. There were 8 other days when the temperature rose above 15 Celsius (59F), with the last of these milder days occurring on the 18th. Apart from on the 1st, when the high was 10.4 Celsius (50F), all maxima up to, and including, the 19th were above 12 Celsius (54F). After the 19th, only 3 days had highs above 12 Celsius (54F), and they were 3 out of the last 4 days of the month. There was a short-lived cool interlude between the 20th and 24th, and these 5 days were the only ones to record maxima under 10 Celsius (50F). The 20th and 24th each had highs between 9 and 10 Celsius (48-50F), the 22nd and 23rd both had highs between 7 and 8 Celsius (45-46F), but on the 21st the temperature only rose to 6.4 Celsius (43F), making it the coldest day of the month.

There were no exceptionally mild nights during November, but overall nights were milder than during the preceding October. All of the mildest nights occurred between the 5th and 19th, and included 10 nights with minima above 10 Celsius (50F). On 5  of these milder nights the temperature stayed above 13 Celsius (55F) with the highest value, 14.2 Celsius (58F), occurring on the night of the 9th/10th. There were a few cold nights, but between the 1st and 20th the only night with a minimum temperature below 5 Celsiuis (41F) was the first night of the month when 4.3 Celsius (40F) was measured. Between the 21st and the end of the month there were a further 5 nights with lows under % Celsius (41F). Only 3 of these colder nights had minima below 3 Celsius (37F) and they were consecutive nights beginning on the 20th/21st. Lowest readings on these nights were 1.4 Celsius (34F), minus 4.2 Celsius (24F) on the 21st/22nd, the coldest night of the month, and minus 2.2 Celsius (28F).   

Frost

There were 2 air frosts during November, and that's 3 below normal. The air frosts were on consecutive nights the 21st/22nd and 22nd/23rd. There were 5 grass frosts, and that's 6 below normal. All the grass frosts occurred between the 21st and 28th, and although the grass frost was slight on 3 of the nights with ground temperatures above minus 3 Celsius (27F), on 2 nights, the 21st/22nd and 22nd/23rd a moderate grass frost occurred with minima of  minus 8.2 Celsius (18F) and minus 6.3 Celsius (20F) respectively.    

Rain

A total of 59.7 millimetres (2.4 ins.) of rain fell during November,  and this was just over 10% below the long-term average. It was the driest November for 4 years. There were 25 days with significant*  rain and this was 9 above average, and along with 2002, it was the highest total since records began in 1988. There were 16 wet** days during November and that was 6 days above average for the month. No rain fell on the first 2 days of the month, but the 3rd yielded 6.5 millimertres (0.25 ins.) and rain fell on each of the following 5 days and included another 5 millimetres (0.2 ins.) on the 5th. The 9th and 11th were both dry but then further rain fell between the 12th and 21st. On the 14th, a total of 7.1 millimetres (0.3 ins.) made that day the wettest of the month, with over 5 millimetres (0.2 ins.) also falling on the 18th. The 22nd was the last dry day of the month, but 5 millimetres (0.2 ins.) fell on the 23rd, with measurable rain then falling on each of the last 7 days of the month.

*Significant rain is defined as one that has 0.2mm or more. ** A wet day is defined as one that has 1mm, or more, of rain 

Thunderstorms

There were no thunderstorms in Morden during November.      

Hail 

No hail was observed in Morden during November. 

Snow

Showery sleet, briefly turned to wet snow just after dawn on the 21st, but it showed no signs of settling and quickly turned to rain before dying out around mid morning.

Wind

Southwesterly winds were very dominant during November and accounted for over two thirds of the daily observations. Light winds on the first 3 days of the month were predominantly from the southeast, and the colder weather towards the end of the month were accompanied at times by winds from a west or northwesterly direction. It was frequently breezy, and on 17 days gusts exceeded 20 Knots (23 mph). On 7 of these windy days there were gusts over 30 knots (34 mph). The highest gusts were 35 knots (40 mph) on the 17th, 39 knots (45 mph) on the 18th, and 36 knots (41 mph) on the 29th.

Fog

There was fog, dense at times, all day on the 1st , with the fog persisting through much of the morning on the 2nd before thinning and lifting. 


Monthly figures for November in, and around, London
 
Place Maximum Minimum Rainfall (mm)
Central London 17.8 -1.5 61
Heathrow A/P 17.5 -1.3 48
Gatwick A/P 16.3 -4.7 71
Croydon 17.2 -3.4 69
Northolt 17.4 -4.1 45
Farnborough 16.7 -4.3 48
Stansted A/P 16.9 -2.3 74

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