How long/warm of a "summer" do you feel is the minimum to "feel like summer" for you? (degree, humidity)

[Westerntraveler]

a real summer that I like is one that has the 90's and 100's from April Fools to Halloween

[Wildcat15]

In general (not tailored to where I live), a "real" summer should have at least 3 months in which the low doesn't drop below 70 degrees.

[Acajack]

The first few degrees above 20C don't cut if for me for summer.

Highs of 18-22C is mid to late spring for me.

Summer for me means highs of around 25C or more (often with humidity) pretty much every single day.

[EverBlack]

I usually define "summer" the weather from June 21 to September 23, regardless of the temperatures. That means usually high temperatures from 70 to 80 (sometimes they drop to 60 and to 90, but rarely beyond). Below 60 doesn't feel like summer at all, more like early fall or late spring, but I guess people in Reykjavik, Torshavn, Prince Rupert, Bergen, Sitka and other extremely oceanic climates with almost no seasonal variation would find a high temperature of 60 summery so I guess it depends on where you live

[Joe90]

Originally Posted by EverBlack

but I guess people in Reykjavik, Torshavn, Prince Rupert, Bergen, Sitka and other extremely oceanic climates with almost no seasonal variation would find a high temperature of 60 summery

Not always the case. I live in a climate that has less seasonal variation than all these listed places, except Torshavn, but a high of 60 is less than the last month of Autumn, or the first month of Spring here..

So I wouldn't find 60F summery.

[Ariete]

At an absolute minimum I could say that 17-18C highs in May are maybe the onset of summer. The trees are in full leaves, and the "real feel" is summer. Otherwise I would go for the 21C (70F) threshold, but a July day with 21C is just an disappointment. In September again, those 17-18C highs feel just autumnlike.

In ideal conditions prolonged 25-30C temps would be an ideal summer.

[Caleb Yeung]

I think if the high is 24C or higher and the low is 12C or higher, it's summer.

[The East Frisian]

For an "early summer feeling" would say a maximum temperature of 20°C (68°F) is the threshold
Real summer starts for me once the temperature has hit the 24°C mark (75°F).

[tom77falcons]

Summer has more than just temperature. I like thunderstorms, some heat waves, and low wind great beach days.

I'm just basing this on my average temps around here. I've never really experienced a year where it felt we had no summer. So I would say having three months of average high temps of 80F or above with low temps through the three months not averaging below 60F would be a real summer.

[chicagogeorge]

In Chicago they call it "88 days of summer" that is when the high temp reached at least 80F/27C