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Weather in South London during July 2015
Rather wet, fairly cool, and breezy.
Temperatures

The average maximum temperature during July 2015 was 22.6 Celsius (73F), and that was 0.7 Celsius (1F) below normal. The average minimum temperature was 13.1 Celsius (56F), and that was 0.4 Celsius (1F) below the monthly normal.  

The highest temperature recorded  was 33.8 Celsius (93F) on the 1st, and this was the highest in July for 9 years. There were no other hot days, although on 5 occasions the temperature exceeded 25 Celsius (77F).  On only 1 of these warmer days, the 3rd with a high of 26.4 Celsius (80F), was 26 Celsius (79F) bettered. All of the warmer days were before the 12th, although there were 8 days, these occurring between the 14th and 21st, when highs between 22 and 24 Celsius (72-75F) were recorded.  The end of the month was cool, and of the 7 days with maxima below 20 Celsius (68F), there were 6 after the 23rd. Only 1 of these cooler days had a maximum temperature below 19 Celsius (66F), but the high of just 16.4 Celsius (61F) on the 24th made it the coolest July day for 10 years.

There was just 1 very warm night during July and that was on the first night of the month. The minimum of 20.1 Celsius (68F) was the second highest recorded in July in records stretching back to 1988. The only warmer night occurred in 2006. There were several fairly warm nights before mid month with minima above 15 Celsius (59F). All 6 of these warmer nights occurred before the 16th, including 2 with lows between 17 and 18 Celsius (63-64F). Most minima were between 10 and 15 Celsius (50-59F) but on 3 nights lows were under 10 Celsius (50F). On 2 of these cooler nights, the low was above 9 Celsius (48F), but on the last night of the month a minimum of 6.6 Celsius (44F) was recorded, and this was the lowest July temperature in Morden for 22 years.   

Frost

There were no air frosts during July and no grass frosts occurred. The lowest grass temperatures were 3.0 Celsius (37F) on the night of the 30th/31st.    

Rain

A total of 58.2 millimetres (2.3 in.) of rain fell during July,  and this was 30% above the long-term average. There were 15 days with significant*  rain and this was 4 above average, and there were 6 wet** days during July and that was 1 day below average for the month. Although the month was unsettled, amounts of rain during the first 3 weeks were small. On the 3rd, over 9 millimetres (0.35 ins) of rain was measured, but only 2 wet days occurred before the 24th and the total between the 1st and 23rd was only just over 15 millimetres (0.6 ins). On the 24th it rained all day. Some of the rain was heavy, and the total of 33.6 millimetres (1.2 ins) made it the wettest July day for 8 years. A further 5 millimetres (0.2 ins) of rain fell on the 26th, but the last 2 days of the month were dry, and this was one of only two 48-hour completely dry periods during the whole 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 3 days of thunder during July. During the evening of the 3rd, storms spread north from France and there was quite intense thunder and lightning for a while before they moved away early on the 4th. Further intense storms developed and moved northeast over west London on the 16th, but in Morden, although lightning was frequent, thunder was confined to distant rumbles.      

Hail 

No hail was observed in Morden during July. 

Snow

No sleet or snow was observed in Morden during July.

Wind

Southwesterly winds were very much in evidence during July and accounted for around 60% of the daily observations. Most of the rest comprised of winds from a west or northwesterly direction. It was a breezy month with moderate, occasionally fresh, being a valid description on many days. In fact, gusts of 20 knots (23 mph) or more were recorded on a total of 14 days. The highest gust was 26 knots (30 mph) measured on the 17th.

Fog

No fog was observed in the Morden area during July, accept for a brief blanket of fog that enveloped the area after skies cleared following the storms in the early hours of the 4th. 


Monthly figures for July in, and around, London
 
Place Maximum Minimum Rainfall (mm)
Central London 34.7 9.8 56
Heathrow A/P 36.7** 8.7 70
Gatwick A/P 34.1 5.1 n/a
Croydon 32.5 6.6 45
Northolt 35.7 6.8 79
Farnborough 32.9 3.6 57
Stansted A/P 30.7 7.0 52

** Unofficially the highest July temperature ever recorded in the UK.

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