If you can put a trickle charger on the car, the battery will be both warm and fully charged in the morning. Cold batteries don't provide as many "cold cranking amps" as warm ones. If you can't run a cord to the car, how about a second battery that lives inside where it's warm, hooked up to a trickle charger. Carry it out to the car (or put it on a cart), jump the car's battery, and you have lots of starting power.

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970