[411mrc]

If we had no sun at all, I'm pretty sure we'd be an ice ball, save for volcanic activity. These impacts from solar activity take some time to develop, as I understand it. If we are in some sort of grand minimum, just wait a decade or so. If the Earth was highly reactive to these events (like breaking cold records everytime a minimum happens), I'm not sure we'd be here. The oceans store/release a lot of heat over the short term (years).

[briantakita]

"40 Inches of Snow in Montana: ‘It’s a February Storm in September’" https://www.nytimes.com/2019/09/29/us/montana-snowstorm.html

This is not an isolated event. Parts of North America & Europe has had snow & hale in the Summer. Australia had an unusually cold winter. There's also historical precedence for these anomalous weather events.

Growing Degree Days compared between 2018-2019 has been falling in all of the US States except Alaska & Florida; over 20% in the northern states. http://iceagefarmer.com/gdd

At what point would APGW be falsifiable? How much summer/early-autumn/late-spring snow would it take?

[jbattle]

That was due to a weakening of the jet stream which normally keeps arctic air further north. There is evidence (inconclusive AFAICT) that global warming is partly to blame for a weak jet stream last winter.

This is why the term "climate change" is more accurate than "global warming". Increased energy in the atmosphere has uneven effects. The overall effect is to warm the earth but due to second-order effects (changes in cloud cover, changes in precipitation), some places won't experience warming but will experience change.

[monkeydreams]

> Australia had an unusually cold winter.

We had bushfires in the middle of winter. That is not a sign of a cool winter. It is a summer event, happening in winter. According to the Bureau of Meterology (BoM), the recent daily maximum during this past winter was 1.79 degrees Celsius warmer than average.

http://www.bom.gov.au/climate/current/season/aus/summary.sht...