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One weather station in Delhi in May recorded a maximum temperature of 52.9C, although the government later said it was due to a sensor error and revised it down by 3C.

There is just one clock that is spared his dutiful hands - the electronic weather station that takes pride of place on the centre of his living room wall.

The team studied the effect of temperature in two ways: using local weather station data for each site and comparing differences in climate regions.

The Germans even set up a weather station in Canada.

Scientists at RBG Kew have been using modelling which looks at Kew's weather station data, climate projections, global tree data and details of the current collection, as well as empirical testing.