Cooler than usual since May

LETTER

Contrary to your story on page four on Monday, Gisborne has already had a number of frosts this winter.

Niwa’s National Climate Database shows the coldest morning so far this winter actually occurred on May 23, when the air temperature dropped to 1.2 degrees, and the grass minimum fell to minus 2.7 degrees.

That was also the hardest frost to date, so the MetService forecaster was wrong to say Monday’s was the “first real frost of the winter”.

Niwa’s database also shows there were three days of ground frost in May.

Up to yesterday morning, there have been five ground frosts so far this month, of which the hardest was minus 1.5 degrees.

This could be a chillier June than usual as the 1981 to 2010 average for days of frost is 7.6.

The year started with four months of warmer-than-usual weather, but the days of May were cooler than usual.

That trend has continued this month, with daytime temperatures down by almost half a degree.

Niwa’s data also show the district’s soils are saturated and cold after four months of above-average rainfall.

Rainfall so far this year is approaching 700mm, not far short of double the rainfall of last year at the same date.

Roger Handford

Contrary to your story on page four on Monday, Gisborne has already had a number of frosts this winter.

Niwa’s National Climate Database shows the coldest morning so far this winter actually occurred on May 23, when the air temperature dropped to 1.2 degrees, and the grass minimum fell to minus 2.7 degrees.

That was also the hardest frost to date, so the MetService forecaster was wrong to say Monday’s was the “first real frost of the winter”.

Niwa’s database also shows there were three days of ground frost in May.

Up to yesterday morning, there have been five ground frosts so far this month, of which the hardest was minus 1.5 degrees.

This could be a chillier June than usual as the 1981 to 2010 average for days of frost is 7.6.

The year started with four months of warmer-than-usual weather, but the days of May were cooler than usual.

That trend has continued this month, with daytime temperatures down by almost half a degree.

Niwa’s data also show the district’s soils are saturated and cold after four months of above-average rainfall.

Rainfall so far this year is approaching 700mm, not far short of double the rainfall of last year at the same date.

Roger Handford

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