May 2018: warmth and thunderstorms

This May will probably be most remembered for the number of thunderstorms affecting the area. I recorded an unprecedented (in my memory) four consecutive days of thunderstorms.

convection
Convective clouds build over Wanstead Flats

It was also warm with a couple of days making the top 10 of hottest days since 1959. The mean temperature finished 15.1C, 2C warmer than average, the warmest May for seven years and the 8th= warmest since 1797.

Rainfall at 65.5mm was 128 per cent of average and slightly drier than last year.

Some 244hrs of sunshine were recorded, 134 per cent of average, making it the sunniest May for 7 years, and the 11th sunniest since 1881.

Spring finished with a mean temp of 11C, 0.8C above average, 1C cooler than last year. Rainfall at 181.9mm, was 135 per cent of average, making it the wettest spring for 10 years. Sunshine of only 411.2 hours made it the dullest spring since 2006.

The warmest day occurred on the 7th with 28.1C.

The wettest day occurred on the 29th with 29.8mm falling during a prolonged thunderstorm.

Air frosts: 0, Ground frosts: 0

This summer in east London is looking average with little to write home about weatherwise.

Summary for May 2018

Temperature (°C):
Mean (1 minute)  14.7
Mean (min+max)   15.1
Mean Minimum     9.0
Mean Maximum     21.1
Minimum          1.8 day 02
Maximum          28.1 day 07
Highest Minimum  15.7 day 31
Lowest Maximum   14.1 day 02
Air frosts       0
Rainfall (mm):
Total for month  65.5
Wettest day      29.8 day 29
High rain rate   60.4 day 28
Rain days        9
Dry days         22
Wind (mph):
Highest Gust     20.6 day 02
Average Speed    2.4
Wind Run         1808.0 miles
Gale days        0
Pressure (mb):
Maximum          1027.4 day 16
Minimum          1001.5 day 02
Days with snow falling         0
Days with snow lying at 0900   0

 

 

 

 

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