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I thought it would've been apparent that I was talking about ice days when I had just predicted first and last frost dates close to average.
No, a freeze is when the night temperature goes below freezing, there's no word for ice day here.
Freeze = air frost
Frost = ground frost
[a frost means you there's literally frost on the plants]
for example, there were some photos of frost and temperatures in the 33-35°F range last weekend. Not a freeze, the NWS issues separate warning for both
Quote:
Originally Posted by nei
a couple of nearby areas got a light frost last weekend; on average no frost here for another month at least
First freeze: December 3rd
Last freeze: March 30th
A first frost is a difficult prediction, it occurs across a range of temperatures, it can even occur after the first freeze. But I'll say November 20th.
Theoretically possible in any month here, but I've never seen one in June, July or August. I don't even remember one occurring in September.
Quote:
Originally Posted by Joe90
I guess, but unless the air temperature is below freezing, it just doesn't seem like the real deal.
Seems hard to believe. Your summers are similar to here, and it's unusual to not see at least one light ground/windscreen frost here during summer.
June record low here: 0.9C
September record low: 1.0C
Though that is on a hillside, the valley bottom would probably have been sub-zero in both cases. Both more than 25 years ago, don't think we've got all that close since. The June sun is up at about 4.30 am, so any frost would be long gone way before most people get up.
First freeze: December 3rd
Last freeze: March 30th
A first frost is a difficult prediction, it occurs across a range of temperatures, it can even occur after the first freeze. But I'll say November 20th.
Good point. I have seen and heard of plants being more damaged on a cold clear night with temps not going below 32F, but an air frost, vs a windier night with a low of say 30F. A number of years here we had a few nights in with low temps between 28F and 32F, and my plants didn't miss a beat and kept flowering cause there was no frost on the plants. Not unusual at all to see annuals flowering in Philly well into December.
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