Hacker News new | past | comments | ask | show | jobs | submit login

Here’s a map of the minimum yearly temperatures in the US: https://www.reddit.com/r/MapPorn/comments/73h7eo/winter_low_...

(note C vs F on the legend)

As someone who lives in California, and likes snow sports, it looks like I could run into -20C conditions in the Sierras, and certainly the Rockies (although driving that far with an electric car would probably be too annoying to attempt).

It’s probably not a concern for the average Bay Area family.

I use a rough metric of 0°F as the lowest low to generally worry about (Fahrenheit is nice that the 0-100°F range is pretty close to the typical ambient temperature range in temperate zones). Despite living around the 5b/6a zone boundary (that's -10°F on the map), I have yet to see my car's temperature gauge report 0°F or below, so the conditions are a bit lower than I'd gauge as "lowest typical low."

But that said, zones 6a/6b are definitely in the region of "yeah, I'd worry about 0°F overnight", and people in 7a will definitely worry about temperatures around 10°F if they're going to start their car. 6a-7a covers most of the population corridor in the NE US, about ⅓ the US population. Additionally, much of the Midwest is in the 0°F-is-possible territory, from St. Louis and Chicago straight through to Detroit and Pittsburgh.

The general point is that starting in -20°C isn't some "well, sucks to live in Canada/Minnesota/North Dakota" concern, but rather "gee, a significant chunk of the US population has to do this on an annual basis."

Two weeks ago I had -32C in MN and it didn’t set any records.

Also my family back there told me it didn't get above -20C for like a week or two in a row.

Guidelines | FAQ | Lists | API | Security | Legal | Apply to YC | Contact