Reality Check · Charleston, SC
2026 GMC Sierra EV AT4 / Denali in Charleston, SC
Winter range, charging cost and how far it goes, worked out for Charleston's weather, grid and prices.
Winter barely touches range in Charleston: at a typical January's 51°F, a Sierra EV AT4 / Denali gets an estimated 395 miles on a charge, within 4% of its 410-mile rating. Charging at home at South Carolina's average rate (15.5¢/kWh) costs about $88 a month for 38 miles a day, about a third of the $271 a gas Sierra costs on the Lower Atlantic's gas. And Charleston's grid (SERC Virginia/Carolina), 23% cleaner than the US average, makes it 75% less CO₂ than gas.
Partly estimated. 2 of 5 temperature bands are from 117 real drives of this model; the rest come from 1,548 real drives in EVs at each temperature (and Recurrent's winter study below freezing), applied to its 410-mile rating. Each band switches to its own drives once it has 20 from 3 drivers.
October range
421mi
At Charleston's typical October day, 69°F · 35% highway
Winter lowEstimated
395mi
January, 51°F · lows near 43°F
Home chargingEstimated
$88/mo
7.6¢ a mile at 15.5¢/kWh. Gas Sierra: $271/mo
Charleston's grid
0.59lb CO₂/kWh
SERC Virginia/Carolina (EPA eGRID): 23% cleaner than the US, 75% less CO₂ than gas
Charleston, season by seasonEstimated
A Sierra EV AT4 / Denali's range on a full charge, averaged over each season's months (30-year normal temperatures), at 35% highway.
Winter Dec–Feb · 53°F
About its rating · coldest week 395 mi
398mi
Spring Mar–May · 66°F
About its rating
416mi
Summer Jun–Aug · 81°F
3% above its rating
423mi
Fall Sep–Nov · 69°FNow
About its rating
420mi
A Sierra EV AT4 / Denali's range through a Charleston yearEstimated
Each month at Charleston's 30-year normal temperature, 35% highway. No day of the year averages below freezing.
How far it goes from Charleston, on real roads
In October, from a full charge with 10% in reserve: about 189 mi out and back, 379 mi one way (January: 356 mi). Dots are DC fast chargers by network.
Fast charging around Charleston
PlugLog's map of every public charger. Tesla-only Superchargers aren't counted.
- 26DC fast chargers within 25 mi
- 3.7 mito the nearest
- ChargePoint293 in reach
- Tesla Supercharger206
- EVgo152
- EV Connect122
- Electrify America62
Road trips in October, about, by road: Deltona (351 mi) and Atlanta (331 mi) one way on a charge; Knoxville (392 mi) with one fast stop.
Questions Charleston drivers ask
How far can a Sierra EV AT4 / Denali go in a Charleston winter?
Charleston's winters are mild: about 395 miles on a typical January day (51°F) and about the same in the coldest week (around January 15, 51°F), estimated from real EV drives at those temperatures. That's within 4% of its 410-mile rating.
How much does it cost to charge a Sierra EV AT4 / Denali in Charleston?
About $88 a month at home for 38 miles a day, at South Carolina's average home electricity rate of 15.5¢/kWh: about 7.6¢ a mile. A gas Sierra on the Lower Atlantic's average gas ($3.86 a gallon) costs about $271 a month for the same driving.
Can I charge a Sierra EV AT4 / Denali on a regular 120 V outlet in Charleston?
Not at 38 miles a day: a 120 V outlet adds only about 32 miles in 12 hours on an average day (30 in the coldest week). Plan on 240 V, which fills it from 10% in about 17 hours.
Is it greener to drive electric on Charleston's grid?
Yes, more than most places. Charleston's grid (SERC Virginia/Carolina) is 23% cleaner than the US average, so a Sierra EV AT4 / Denali charged on it makes 75% less CO₂ than a gas Sierra.
Check it for your own address
Your street, your daily miles, any temperature on the knob.
Sierra EV AT4 / Denali Reality Check near Charleston
Sources: temperatures, 30-year normals (NOAA 1991–2020) at Charleston City, SC; home electricity, EIA (South Carolina, July 2026); gas, EIA weekly (the Lower Atlantic); grid CO₂, EPA eGRID 2023; cold-weather range, PlugLog's real drives and Recurrent's winter study (Nov 2025); chargers, Open Charge Map and PlugLog. Updated Oct 22, 2026.