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Old 08-17-2012, 01:56 PM
 
Location: North West Northern Ireland.
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Erm why would a frost be unusual at 59n in latitude?? I had a 2c min a few weeks ago and i'm at 55n. Seriously it really wouldn't be THAT hard to get an august frost. Maine gets its first frost in september and they are latitude 47n.

It might be unusual to get it this early but i'm sure its probably occurred before.
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Old 08-17-2012, 02:01 PM
 
Location: Laurentia
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Latitude isn't all that relevant (just ask the coastal Norwegians). Maine's climate is more similar to parts of Scandinavia despite it being 10 degrees further south in latitude. I've looked at the normals for Estonian cities and the capitol's average low this time of year is 54F. Other parts of the region are in the same ballpark.

With the variation typical of European and Laurentian cities I don't think frost would be a routine thing. I'm sure it has occurred before in August across the region (probably many times), but it seems to be rather unusual.
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Old 08-17-2012, 02:07 PM
 
Location: North West Northern Ireland.
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Well I do apologise because I had thought that Estonia because it had a colder winter would get its first frost long before us but it seems to only get it about a week or two before us which is surprising because I would've thought at that latitude that you would get first frosts pretty early. I think for them its in and around late september that the first frost comes. But in Europe it varies alot because of cloud.

If you look at wundermap a pattern of some sort will usually tell you when the first frost is. Embarrassingly its around the 15th october here which is really late for this latitude.
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Old 08-17-2012, 02:31 PM
 
Location: Leeds, UK
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Tallinn is coastal.. then nights cool down fairly rapidly in late September.
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Old 08-18-2012, 01:50 AM
 
Location: Estonia
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Yes, frosts are uncommon in August and warnings are given so people can cover up their produce. That said, summer frosts do happen, especially at the bottoms of valleys inland. Several years ago -4C was recorded on ground level in July. Official record lows for air temperature in June, July and August are -2,6C, 0,5C and -0,6C respectively.

Usually first overnight frosts start to occur in late September. This can wildly vary from year to year though. Last year was record-breaking as summer and fall were both more than 3C above average and iirc first frosts happened in November. That warm period was followed by an ultra cold February.
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Old 08-20-2012, 12:32 AM
 
Location: Estonia
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Tonight is the first night since late April where not even astronomical twilight lasts throughout the night. For 48 minutes, it's pitch black. A sign of times to come and another win for Fall. Funny that this day of darkness coincides with a national holiday.
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Old 08-20-2012, 04:59 AM
 
Location: Finland
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Wow, frost seems a bit extreme, when 80 km north we are expecting night lows of 12-14C at the coast. Ok, frost could be possible according to the forecast, but in Lapland, 1000 km north from Estonia!

But it is chilly. The autumn will come way too early after this terrible summer.
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Old 08-20-2012, 05:05 AM
 
Location: North West Northern Ireland.
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The GFS is forecasting snow for Northern Scandinavia is that near where you live?
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Old 08-20-2012, 05:20 AM
 
Location: Estonia
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He's in southern Finland. It's strange that going by wikipedia's stats, Helsinki is about a degree warmer than Tallinn throughout the year. It's also sunnier.

Was summer terrible in Finland? July was more than a degree warmer than normal here but everyone's bitching about how cold it is. I guess they got used to the last two record hot summers.

Northern Lapland seems to be dropping near freezing regularly now but it's a cold wave, usually nights drop below freezing at the end of September there.

Last edited by Hiromant; 08-20-2012 at 05:30 AM..
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Old 08-20-2012, 06:04 AM
 
Location: Ann Arbor, MI
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Here are the trees I mentioned earlier. I think I saw them like this last year, I don't remember. Can't wait for fall!
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