In where you live, what weather extremes are most likely to occur?

[Mhc1985]

In Buenos Aires it's definitely heavy rain.
Then it comes heavy thunderstorms, that may or may not have heavy rain associated, and whose main features would be strong wind gusts and a lot of electrical activity. In the worst cases, the city is hit by bow-echoes and tornadoes.

Out of this kind of phenomena, we can secondarily consider extreme heat waves, with very high humidity/dew points and high lows rather than very high maximums.

[Adi from the Brunswicks]

Heat waves. It gets too damn hot here for living so far up north , and dew points can be extremely bad.

We had a dew point of 84 F a couple years back, and upper 70's F dew points happen every summer . It also hits 100 F almost every summer as well. Thankfully, this is offset by days with Nighttime lows around 50 F and highs lingering in the low 70's F.

[Mac15]

40 north is not north at all...

[Jakobsli]

In my town on the shores of a fjord in central Norway, windstorms are our most likely extremes. They usually happen in late autumn and winter. Most of them follow the shoreline and do not get very far into the fjords, so is not noticed much here.
Last November /December we had two such extreme storms - two extreme stoms in such short time is not common. One came very sudden, the wind speed increased from virtually calm to strong storm in a few minutes. Luckily we were warmed by the forecast. In the old days, such a storm would be a killer for those at sea.

[overdrive1979]

Winter:
European windstorms are possible with gusts up to 90-120 km/h and moderate to heavy rain.
Endless overcast skies by low stratus and fog are possible at early winter when high pressure hit us.
Amount of snow higher than 30 cm are possible too, at least one or two times per year.
Lowest possible temperatures during cold snaps can reach -14 °C at night and -2°C at day.
Warmest temperatures likely can reach 14º C in some sunny days.

Spring:
Both snow and frost are possible sometimes until early May.
European winter windstorms are possible in March, but almost imposible in April and May.
Large daily range of temperature is possible too, I say highs reaching 22-24º C and lows near 0º C.
Lots of thunderstorms can happen at late spring.
The higher prevalence of convective activity at late spring make this time of the year the less prone to endless clear weather for several consecutive days.

Summer:
Lots of sunshine, interrupted every 8 or 10 days by thunderstorms, which at that time of the year tend to be the strongest ones.
Thunderstorms growing at night hours are possible too
Warmest can reach 35º C one time or two per year, but affortunately lows can drop to 12 or 14º C at night, having lower minimums about 18 or 19º C only two times per year in average.

Autumn:
Thunderstorms are possible in September, bur rarely the rest of the season.
First frost can happen at mid or late October, and first snow at mid November.
European winter windstorms are possible in late October and November too.
Our geographical situation near the norhteastern side of Atlantic ocean makes Spain and Portugal the most prone Mediterranean-climate countries to European windstorms.

[Kamsack]

For the eastern Dakotas...in the winter most extreme is a deep low that stalls in western Wisconsin while a large arctic high is over Saskatchewan. It would produce a 48 hour period of 50-70 mph winds along with a foot of snow causing a long severe blizzard. In the summer...most extreme would be an upper ridge over our area with a 30 day dry period and temps over 90 every afternoon ruining the row crops.

Dan - Grand Forks ND