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Weather in South London during April 2015
A dry and fairly warm month.
Temperatures

The average maximum temperature during April 2015 was 16.0 Celsius (61F), and that was 1.4 Celsius (2.5F) above normal. The average minimum temperature was 4.9 Celsius (41F), and that was 0.6 Celsius (1F) below the monthly normal.  

The highest temperature recorded  was 25.2 Celsius (78F) on the 15th, and this was the highest April temperature for 4 years. There were 2 other days when the temperature exceeded 20 Celsius (68F), the 10th, with a high of 20.9 Celsius (70F), and the 14th, when the maximum was 22.7 Celsius (73F). In total, there were 15 days when the temperature exceeded 16 Celsius (61F), with 10 of these warmer days occurring between the 6th and 16th. The coolest days were at either end of the month, with the 1st to the 5th, and the 26th to the 29th each having maxima below 13 Celsius (55F). The only cool day aside from those dates was the 19th with a high of 11.8 Celsius (51F). The coolest day of the month was the 4th with a maximum of 9.9 Celsius (50F).

There were no especially mild nights during April, in fact there were only 2 nights with minimum temperatures above 9 Celsius (48F). On the 10th/11th a minimum of 9.9 Celsius (50F) was recorded, but the mildest night was the 24th/25th when a low of 10.9 Celsius (52F) occurred. On most nights, temperatures fell to between 4 and 8 Celsius (39-46F), but on 11 nights minima were below 4 Celsius (37F). On 5 of these colder nights temperatures dipped below  2 Celsius  (36F), but the only 2 nights with minima below 1 Celsius (34F), were the 5th/6th, with a low of minus 0.1 Celsius (32F), and the following night when 0.6 Celsius (33F) was logged.   

Frost

There was 1 air frost during April, and that's 1 below the average. The air frost, on the 6th,  could not have been slighter, with only 0.1 degrees of frost recorded. There were 12 grass frosts, and that's 2 above average for the month. They were evenly divided with 6 occurring before mid month and the other 6 occurring after the 15th. In fact, there were 2 spells of cold nights, with grass frosts only occurring between the 5th and the 12th; and between the 20th and 28th. The grass frosts were mostly slight  with just 5 grass minima below minus 2 Celsius (28F), and with only 1 of these having a reading below minus 3 Celsius (27F). The lowest grass temperature was minus 3.3 Celsius (26F) measured on the night of the 5th/6th.    

Rain

A total of 22.3 millimetres (0.9 in.) of rain fell during April,  and this was only around 40% of the long-term average. It was the driest April for 4 years. There were 8 days with significant*  rain and this was 5 below average, and there were 6 wet** days during April and that was 3 days below average for the month. The first 4 days of March were changeable with rain falling on each day, and over 3 millimetres (0.1 in.) measured on both the 1st and the 3rd. Apart from just over 1 millimetre (0.04 ins), recorded on the 10th, there was no significant rain between the 5th and 23rd. Rain fell overnight on the 24th/25th, and on the following day almost 6 millimetres (0.25 ins) was measured. After 2 more dry days, further rain fell overnight on the 28th/29th and the rain attributed to the 29th, a total of 6.1 millimetres (0.25 ins), made it the wettest day 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

No thunderstorms were observed during April.     

Hail 

No hail wasl observed during April.

Snow

No sleet or snow was observed in Morden during April.

Wind

Unusually, the proportion of winds from an easterly quadrant, equalled those from a westerly quadrant. In fact, northwesterly winds were almost non existent. Between the 2nd and 9th, winds were mainly from the southeast, and from the 15th and 23rd breezes were mainly from between northeast and southeast, otherwise southwest was the prevalent direction. Most of the winds were gentle or moderate in strength, with the strongest winds arriving from the southwest. On 8 days, gusts exceeded 20 knots (23 mph), with 6 of these highest gusts accompanied by southwesterly winds. The highest gust recorded was 25 knots (29 mph), and this was measured on both the 11th and 12th.

Fog

Fog was observed early on the 9th, but it lifted and cleared before mid morning. 


Monthly figures for April in, and around, London
 
Place Maximum Minimum Rainfall (mm)
Central London 25.0 3.7 22
Heathrow A/P 24.6 1.8 16
Gatwick A/P 24.3 -1.2 19
Croydon 22.9 0.3 28
Northolt 24.7 0.6 20
Farnborough 23.3 -1.6 22
Stansted A/P 23.1 0.4 33

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