Warmest Temperatures for Frost to Linger. (records, nights, town, freezing)

[Infamous92]

I don't think I've ever seen frost linger at temperatures greater than 4-5C.

[Joe90]

Originally Posted by Infamous92

I don't think I've ever seen frost linger at temperatures greater than 4-5C.

What about in the shade at low relative humidity?

Even with every day getting maximums above 10C here last week, the frost accumulated day upon day in shaded areas.

[ilovemycomputer90]

Originally Posted by Joe90

What about in the shade at low relative humidity?

Even with every day getting maximums above 10C here last week, the frost accumulated day upon day in shaded areas.

I don't recall ever seeing frost accumulate here. Maybe up to 5 C or so in shaded areas and usually gone by mid-to-late morning.

[Joe90]

Originally Posted by ilovemycomputer90

I don't recall ever seeing frost accumulate here. Maybe up to 5 C or so in shaded areas and usually gone by mid-to-late morning.

Serious? - not even in the shade?

In cold spells here, shaded areas grow whiter by the day.

[ilovemycomputer90]

Originally Posted by Joe90

Serious? - not even in the shade?

In cold spells here, shaded areas grow whiter by the day.

So it doesn't melt at all during the day and builds up?

[dunno what to put here]

Seems like what happens in New Zealand doesn't happen anywhere else in the world. Very interesting indeed.

[Joe90]

Originally Posted by ilovemycomputer90

So it doesn't melt at all during the day and builds up?

In the shade, absolutely. I'm finding it hard to accept that this doesn't occur where you are.

Is it perhaps because you have snow cove?, or that your air is drier than here, resulting in lesser amounts of dew to freeze

Originally Posted by dunno what to put here

Seems like what happens in New Zealand doesn't happen anywhere else in the world. Very interesting indeed.

Possibly too low of a diurnal range in the UK to enable sustained conditions like that to occur?

[ilovemycomputer90]

Originally Posted by Joe90

In the shade, absolutely. I'm finding it hard to accept that this doesn't occur where you are.

Is it perhaps because you have snow cove?, or that your air is drier than here, resulting in lesser amounts of dew to freeze

Frost usually occurs during the spring and autumn here. During the winter it's usually too cold and dry.

[Joe90]

Originally Posted by ilovemycomputer90

Frost usually occurs during the spring and autumn here. During the winter it's usually too cold and dry.

It must happen in Autumn there, surely?

A night with temperatures around -3/-4C, and a maximum during the day of around 10C -wouldn't the frost in shaded areas last all day in that scenario?

I'm thinking of a conversation I had with a Canadian some time ago, when we were talking about frost, and he said that frost was more of a feature here than where he was from. I guess it's not as easy to see significant humidity combined with higher diurnal ranges, in colder climates.

[Joe90]

I think frozen rain saturated ground (2-3 inches deep) and a ground level inversion would easily explain the situation. Ground would gain heat very slowly in the absence of sun.

That's the point of measuring ground temperature I guess -that's the temperature that matters, not the air temperature.

The ground is the smallest microclimate really - I've been living in -3C/13C land, while a wee mouse, or an ant would have been living in 0C to -9C land.