Anorak | July 1 2015 was the hottest day on record for jets at Heathrow Airport

July 1 2015 was the hottest day on record for jets at Heathrow Airport

by | 12th, July 2015

According to the Met Office, 1 July 2015 was the “warmest July day since records began”. The record was set at Heathrow Airport “when the temperature reached 36.7 °C at 3.13pm. The previous highest July temperature was 36.5 °C on 19 July 2006 in Wisley, Surrey.”

Hot, then. But was it really a record?

Mark McCarthy, Manager of the Met Office National Climate Information Centre discusses records and how we record them.

He states:


1 July 2015 has the honour of holding the highest recorded temperature for a July day with 36.7 °C at Heathrow.


What do we know about Heathrow?

On 1 July the maximum temperature recorded at Heathrow (36.7 °C) was higher than Kew (35.7 °C).

Kew and Heathrow are around 8 miles apart.

Modern instrumentation means we can look at the temperatures minute-by-minute at the two sites, as shown below. The two locations recorded very similar temperatures through most of the afternoon and the average temperature at the two sites between 12:00 and 18:00 GMT agree to within 0.02 °C. However, there was a peak in temperature at Heathrow between 14:00 and 14:30 GMT that was not seen at Kew Gardens. 

We get to see a graph.


hottest day on record



We can see the sudden spike in temperature, which led to that record-breaking peak.

Why did it spike? And why didn’t it spike in Kew? The Met Office says is clould be down to cloud cover.

But we don’t

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Posted: 12th, July 2015 | In: News Comment | Follow the Comments on our RSS feed: RSS 2.0 | TrackBack | Permalink