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1. Clear skies.
2. Low humidity.
3. Uppers lower than 5c. 4. Max temperature less than 15c.
That's cold air for late May or June for us. We need an incursion of cold air to get (4). If we do get (4) it almost certaintly be accompanied by cloudy skies usually with rain. Agree with the four needs, though actually if the air is dry enough you can a frost with upper 60s, maybe low 70s. Not sure about uppers.
Current 850 mb (12Z — what does that mean?! is it 8 am EDT?) is 4°C. Current temperature is 19°C, forecast low 5°C. We had a frost on the 15th, 850 mb temps were below 0°C at 0Z May 15.
There are a lot of tropical plants that can't handle temperatures 5C and below (and a lot of lower zone gardeners are now planting tropical plants outside for the summer)
Please is frost &/or temps below 5C showing anywhere between Montreal and Saskatchewan in the next two weeks (re Euro).
That's cold air for late May or June for us. We need an incursion of cold air to get (4). If we do get (4) it almost certaintly be accompanied by cloudy skies usually with rain. Agree with the four needs, though actually if the air is dry enough you can a frost with upper 60s, maybe low 70s. Not sure about uppers.
Our June record is 29°F.
Well you are further way from Greenland and that is were most of the cold is in the summer so it doesn't have very far to go to reach me. We usually get -3c uppers a few times in the summer like e.g July.
Well you are further way from Greenland and that is were most of the cold is in the summer so it doesn't have very far to go to reach me. We usually get -3c uppers a few times in the summer like e.g July.
As I said, Greenland isn't a source for cold air for me. It's in the wrong direction.
I'm pretty sure it comes from that big country north of the US.. what is it called again? Canada is it?
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