Battery Reserve Capacity in Cold Weather Riding

[bikerjohn]

It was between 64-70 degrees today on my 28.5 mile 1:45 minute commute:
https://connect.garmin.com/modern/activity/735496919
When I finished the ride it appeared that my 36V 12Ah battery had about 25% energy remaining;

On the 24th of March, the temperature at ride start was 30 degrees. After my 1 hour commute the battery capacity was registering in the red zone. I would estimate it had 10% or less power in reserve.
https://connect.garmin.com/modern/activity/728331682

Has anyone had much cold weather riding experience?

 

[J.R.]

Anything below 35F cut into my range by 5%-15%, below 15F (many days this year) hit the 15% mark easy. In other words Thanksgiving to 1st day of spring I rode less, I would have anyway Still rode though

 

[bikerjohn]

I prefer NOT to subject a battery or my body to cycling in temperatures below 30 ºF;
Biking cautiously over a steel deck bridge in temperatures near freezing is a matter of safety...
http://www.bikejournal.com/blog.asp?rname=bikerjohn&cdate=3/25/2010