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Old 02-21-2024, 01:00 AM
 
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The year of 2019 at Port Fairy ( Victoria, southern AU ). Many people are astounded at the variability of this southern Australian coastal location !

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Old 02-21-2024, 09:45 AM
 
Location: Centre Wellington, ON
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Quote:
Originally Posted by greysrigging View Post
The year of 2019 at Port Fairy ( Victoria, southern AU ). Many people are astounded at the variability of this southern Australian coastal location !
Yeah, those kinds of variations in daily highs during a summer month aren't going to be matched by very many places. It would have to be somewhere in the mid or upper latitudes where you can get a back-and-forth between hot and dry and cool and wet.

There are places that can get to 40C+ like Greece, Spain or the Yangtze Valley, but they will typically maintain 25C+ highs even when it cools back down. Likewise for the south central US like Dallas, Tulsa, St Louis, Wichita.

Of course the subtropical/hot desert regions like the SW US, Sahara, Arabia, Thar desert will remain very consistently hot (30C+ days) during their summers.

And 15-20C summer highs aren't too unusual in mid-upper latitudes like where I live if we get some cloudy, rainy weather, but heat waves here tend to max out at around 35C because the climate is too humid to get hotter.

Australia makes sense - the southern ocean is still relatively cool, but the outback is dry enough and at a sufficiently low latitude that it can get very hot.

The mid-latitudes of western North America also make sense. Close enough to the Arctic and Pacific which can both be sources of cooler temperatures, but also prone to dry summers, and have long sunny days that allow temperatures to ratchet up. It's not just Lytton that got hot during the heat dome, even Portland got very hot - 46.7C on June 28, 2021, but the daily high was just 17.2C on June 11, 2021. Even Abbotsford BC quite close to the coast reached 42.9C, even though it had a high of only 11.9C on June 6 of the same month.

The South America Chaco can also see big extremes in spring/early summer with both >40C days and <20C days. Hot temperatures aren't that surprising for that latitude and time of year. However, it is unusual that such latitudes could get so cool. Ex Rivadavia has a September record high of 45.5C and record low of -1C. The northern counterpart might be the Thar Desert - which unlike the Chaco, lacks a wet season and is dry year-round. Mohenjo-Daro in Pakistan has a March record high of 48.5C and record low of 3.0C, and October records of 49.5C and 0.0C.

Lytton's June records by comparison are 49.6C and 4.4C, and Portland's are 47C and 4C.

The Prairies can have wider a bit wider ranges than BC/OR/WA, due to being more prone to cold in spring and summer.

Emerson, MB May records: 41.1C & -10.6C
Yellow Grass, SK May records: 39.0C & -13.3C
Yellow Grass, SK Jun records: 40.0C & -6.0C
Yellow Grass, SK Jul records: 45.0C & -1.7C

I don't have data for Port Fairy's all time records, for nearby Warrnambool has a 43C difference between monthly hot & cold records during its summer months which is still very impressive.

I would imagine that the Asian steppe, and parts of Siberia to the north of it, can see pretty wide extremes too during its spring-summer months, although it seems like maybe not quite as extreme as western North America, the Chaco and Thar Desert.
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Old 02-21-2024, 02:12 PM
 
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Port Fairy records ( max and min )

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Old 02-21-2024, 03:30 PM
 
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This thread is proving more popular than I expected, glad to see you folks like it.

As long as I'm here:

-Ocala Airport, March and April 2015. This is a more extreme case of the Augusta Daniel Field kind of thing, March 30 2015 reached 3C but April 2015 never got below 15C.

-Conroe Airport, December 2022 (and I guess you could say the entirety of the 2022/23 winter). From December 6-14 was nothing but tropical days (21/17C to 28/22C), then December 23 had a low of -8C followed by a 1/-6C Christmas Eve, a 7/-4C Christmas, a 12/-2C Boxing Day....and then no more frost, in fact after December 27 the winter never got below 2C!

-Fort Worth Airport, November 2017. November 2 was 35/18C, November 4 32/14C, and November 5 34/21C, whereas November 8 sharply dropped off to 10/7C.

-Valdosta Airport, January, February, and March 2015. It's not just the sheer differences between days, but also the fact that the minimum AND maximum temperatures for these months happened in these short 5-10 day timeframes.

January 2-9: 20/12C, 26/16C, 23/13C, 15/4C, 17/2C, 17/1C, 5/-5C, 11/2C (monthly 26C maximum and -5C minimum only 5 days apart)

February 18-23: 12/-1C, 5/-3C, 10/-5C, 21/-1C, 25/9C, 23/13C (monthly 25C maximum and -5C minimum only 2 days apart)

March 1-10: 15/7C, 23/11C, 28/11C, 28/14C, 27/11C, 11/4C, 19/3C, 24/2C, 27/8C, 30/14C (monthly 30C maximum and 2C minimum only 2 days apart)
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Old 02-22-2024, 03:42 PM
 
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Eyre, on the Nullarbor Plain in March 2008... wild day to day and diurnal swings. Charts showing min and max temps for the month

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Old 02-22-2024, 04:09 PM
 
Location: Centre Wellington, ON
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Quote:
Originally Posted by greysrigging View Post
Port Fairy records ( max and min )
It's interesting that Australia sees greater variation in temperature in the summer, whereas in most of the northern hemisphere, there's greater variation in the winter.

Difference between record high and record low

Port Fairy
Jan: 39.7C
Feb: 36.5C
Mar: 36.0C
Apr: 35.8C
May: 28.3C
Jun: 24.5C
Jul: 21.9C
Aug: 25.1C
Sep: 30.9C
Oct: 34.3C
Nov: 35.8C
Dec: 41.8C

Guelph (closest city near me with fairly long lasting records)
Jan: 53.9C
Feb: 48.3C
Mar: 55.3C
Apr: 45.9C
May: 40.0C
Jun: 37.3C
Jul: 36.6C
Aug: 39.4C
Sep: 43.4C
Oct: 42.2C
Nov: 44.5C
Dec: 50.2C

Lytton BC is more even but still a bit more extremes in winter than summer
Jan: 48.2C
Feb: 43.3C
Mar: 45.8C
Apr: 41.7C
May: 43.5C
Jun: 45.2C
Jul: 38.3C
Aug: 35.5C
Sep: 41.8C
Oct: 48.0C
Nov: 50.5C
Dec: 48.4C
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Old 02-23-2024, 03:48 AM
 
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Melbourne, AU the last 5 days:

Hobart, AU the last 5 days:

Adelaide, AU the last 5 days:
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Old 02-23-2024, 11:00 AM
 
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Quote:
Originally Posted by memph View Post
It's interesting that Australia sees greater variation in temperature in the summer, whereas in most of the northern hemisphere, there's greater variation in the winter.

Difference between record high and record low

Port Fairy
Jan: 39.7C
Feb: 36.5C
Mar: 36.0C
Apr: 35.8C
May: 28.3C
Jun: 24.5C
Jul: 21.9C
Aug: 25.1C
Sep: 30.9C
Oct: 34.3C
Nov: 35.8C
Dec: 41.8C

Guelph (closest city near me with fairly long lasting records)
Jan: 53.9C
Feb: 48.3C
Mar: 55.3C
Apr: 45.9C
May: 40.0C
Jun: 37.3C
Jul: 36.6C
Aug: 39.4C
Sep: 43.4C
Oct: 42.2C
Nov: 44.5C
Dec: 50.2C

Lytton BC is more even but still a bit more extremes in winter than summer
Jan: 48.2C
Feb: 43.3C
Mar: 45.8C
Apr: 41.7C
May: 43.5C
Jun: 45.2C
Jul: 38.3C
Aug: 35.5C
Sep: 41.8C
Oct: 48.0C
Nov: 50.5C
Dec: 48.4C
I'm curious since there seems to be some wild temperature swings coming there, how typical are swings like that for Canada? Is it the norm?
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Old 02-23-2024, 07:22 PM
 
Location: Centre Wellington, ON
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Quote:
Originally Posted by MageDragon View Post
I'm curious since there seems to be some wild temperature swings coming there, how typical are swings like that for Canada? Is it the norm?
Not unusual at all. I don't consider a 23C swing between a cold night and a warm day a few days later to be "wild", especially for late February.

It'll drop to about -13C tonight which is not much below average, and then it's supposed to rise to 10C on the 27th, which is pretty warm, but hardly unheard of for late February.

Range of temperatures for last 10 days of February

2024: 23C?
2023: 19.9C
2022: 24.6C
2021: 26.6C
2020: 23.1C
2019: 30.7C
2018: 18.1C
2017: 19.8C
2016: 22.7C
2015: 21.4C
2014: 32.2C
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Old 02-23-2024, 08:09 PM
 
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Quote:
Originally Posted by memph View Post
Not unusual at all. I don't consider a 23C swing between a cold night and a warm day a few days later to be "wild", especially for late February.

It'll drop to about -13C tonight which is not much below average, and then it's supposed to rise to 10C on the 27th, which is pretty warm, but hardly unheard of for late February.

Range of temperatures for last 10 days of February

2024: 23C?
2023: 19.9C
2022: 24.6C
2021: 26.6C
2020: 23.1C
2019: 30.7C
2018: 18.1C
2017: 19.8C
2016: 22.7C
2015: 21.4C
2014: 32.2C
Ah. I suppose so. I was just overhearing a convon in which somewhere near there is 10C but is gonna drop to -20C the next day so a 30C difference within a day. I forget his exact city though.


Also check out Elko Nevada during November 1894. Lots of days around 15C to 25C/ 59F to 77F but mornings well below freezing.

Last edited by MageDragon; 02-23-2024 at 08:18 PM..
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