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Old 10-20-2010, 04:16 PM
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Location: Western Massachusetts
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Quote:
Originally Posted by deneb78 View Post
Wow.. didn't realize that New England could have such a large diurnal range in temps. Almost sounds desert-like to me.
Yea, I noticed that when I moved here. It's not the norm, but can happen when during high pressure systems. Usually those days bring great "blue-dome" skies and mornings that heat up very fast as soon as the sun rises. The other places I lived had the Atlantic Ocean or the Great Lakes to tone done the diurnal range. Biggest range I saw was 40F in the morning and 90F in the day, early this April.

It sounds desert-like, but we get only few inches less precipitation than Vancouver.
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Old 10-20-2010, 04:30 PM
 
Location: Bangkok, Thailand
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Quote:
Originally Posted by B1987 View Post
No frost here yet. Though it will get close tonight as our forecast low is just 2C. We don't usually see frost until mid or late November, and even then we only get about 25 frost days per year. Central London only sees 7 frost days per year, mostly in Jan/Feb.
Really? I figured there would be a lot more than that as the winter minima are barely above freezing.
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Old 10-20-2010, 05:59 PM
 
Location: Iowa
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A few mornings I've had a little frost on the edges of my garage roof, but no hard freeze on the ground yet. Local weather said, changes are coming we may get a hard freeze next week lakeside, but that would be normal. We have had a gorgeous fall so far, many days just above average.
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Old 10-20-2010, 06:19 PM
 
Location: Surrey, London commuter belt
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Quote:
Originally Posted by ChesterNZ View Post
Really? I figured there would be a lot more than that as the winter minima are barely above freezing.
The average lows at Heathrow Airport are 3.6C for December, 2.8C for January and 2.7C for February. In Central London those figures are around 4-5C.

Average number of frost days at Heathrow:

Oct: 0.2
Nov: 3.0
Dec: 5.2
Jan: 6.6
Feb: 6.6
Mar: 3.0
Apr: 0.8

Year: 25.4
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Old 10-20-2010, 06:21 PM
 
Location: USA East Coast
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Quote:
Originally Posted by B1987 View Post
No frost here yet. Though it will get close tonight as our forecast low is just 2C. We don't usually see frost until mid or late November, and even then we only get about 25 frost days per year. Central London only sees 7 frost days per year, mostly in Jan/Feb.
Hmmm:

I would agree that considering London’s latitude (52 N) it has far fewer days at or below 32 F (0 C) than normal...but that sounds a bit too low to me too. The predominantly cloudy skies and humid atmosphere in winter tend to retard nighttime cooling in oceanic climates. However…according to several sites I have seen, London has about 40 days that fall to 32 F (0 C) or less. I know there are several sources out there…but here is one that says 37 days fall to freezing in London. In fact, according to this, London will see a frost 6 out of 12 months annually:

Weather reports, weather forecasts, weather averages for United Kingdom
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Old 10-20-2010, 06:26 PM
 
Location: Surrey, London commuter belt
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London is at 51N, those figures seem completely wrong for almost every category. Only 67 days per year above 70F (we get about that many during the 3 summer months alone) Highest recorded temperature 96F? More like 101F. 113 days with fog? More like 3-5 days. Average temperatures? All cooler than the true values. 226 days with trace precipitation? London gets 140 such days per year.
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Old 10-20-2010, 06:55 PM
 
Location: USA East Coast
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Quote:
Originally Posted by B1987 View Post
London is at 51N, those figures seem completely wrong for almost every category. Only 67 days per year above 70F (we get about that many during the 3 summer months alone) Highest recorded temperature 96F? More like 101F. 113 days with fog? More like 3-5 days. Average temperatures? All cooler than the true values. 226 days with trace precipitation? London gets 140 such days per year.
There is a lot of sites out there…and it can be frustrating that they are all a little different in their data. Over the years of looking at long term weather data I always thought a good way to get the best representation is a rough average of several sources of data:

Here is the data for Greenwich/London from the official UK Met office (the UK’s version of the National Weather Service). I would think they are one of the better sources of data. They report 29.1 days with frost…about 7 less than the above site. They also show there are only 2 months (July, August) when the average daily high is 21 C /70 F or higher. Considering the averages for both July and August are 22 C/71.8 F in London…I would be surprised to see London having much more than 70 to 80 days a year above 21 C /70 F. I could be wrong.

Met Office: Climate averages 1971–2000

I’ll keep searching to see what else I can find…
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Old 10-20-2010, 07:12 PM
 
Location: Surrey, London commuter belt
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July and August average 23.4C (74.1F) and 23.0C (73.4F) respectively at the Heathrow Airport site. June averages 20.9C (69.6F).

Weatheronline (Weather Online UK - current weather and weather forecast worldwide) has a lot of good data, as does the Met Office site (only historic data for Heathrow Airport, no averages unless you want to work them out yourself).

Here are the average high/low, frost days and snow days for London Heathrow.

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Old 10-20-2010, 07:41 PM
 
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Can't believe we haven't had a killing frost yet ( central Minnesota)

very unusual
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Old 10-20-2010, 07:58 PM
 
Location: New Jersey
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We've probably had four or five frosts already.
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