Based on my experience and…
Based on my experience and knowledge of rash winters in Finland there is couple of things wrong in your blog post. It is constantly here more than -15C and couple of weeks with more than -30C
Let me correct some claims that are just incorrect or need explanation:
"A typical 20-mile commute to work can result in an 18% battery drain in freezing temperatures."
While this is true it is only because you start with cold cabin twice a day and initial heating to target temperature uses 7kW of energy for major part of your journey. If you start pre-heated that drops to 1kW ish for the whole duration of the trip.
"A full day of parking outdoors at work can consume an additional 20% of the charge."
This is not true. In truth the drain is typically 0-1%. If you lose 20% during workday there is something wrong in your cat.