Reality Check · Phoenix, AZ
2025 GMC Sierra EV in Phoenix, AZ
Winter range, charging cost and how far it goes, worked out for Phoenix's weather, grid and prices.
Winter barely touches range in Phoenix: at a typical January's 55°F, a Sierra EV gets an estimated 381 miles on a charge, about its 390-mile rating. Summer is the harder season here: at July's 92°F average (highs near 104°F), air conditioning trims it to about 361 miles. Charging at home at Arizona's average rate (15.4¢/kWh) costs about $98 a month for 38 miles a day, about a third of the $362 a gas Sierra costs on the West Coast's gas. On Phoenix's grid (WECC Southwest), about the US average, it makes 68% less CO₂ than gas.
Partly estimated. 2 of 5 temperature bands are from 116 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 390-mile rating. Each band switches to its own drives once it has 20 from 3 drivers.
October range
361mi
At Phoenix's typical October day, 75°F · 35% highway
Winter lowEstimated
378mi
January, 55°F; Dec 17–23 at 53°F · lows near 42°F
Home chargingEstimated
$98/mo
8.5¢ a mile at 15.4¢/kWh. Gas Sierra: $362/mo
Phoenix's grid
0.70lb CO₂/kWh
WECC Southwest (EPA eGRID): about the US average, 68% less CO₂ than gas
Phoenix, season by seasonEstimated
A Sierra EV's range on a full charge, averaged over each season's months (30-year normal temperatures), at 35% highway.
Winter Dec–Feb · 55°F
About its rating · coldest week 378 mi
381mi
Spring Mar–May · 70°F
6% below its rating
369mi
Summer Jun–Aug · 90°F
8% below its rating
360mi
Fall Sep–Nov · 74°FNow
6% below its rating
367mi
A Sierra EV's range through a Phoenix yearEstimated
Each month at Phoenix's 30-year normal temperature, 35% highway. No day of the year averages below freezing.
How far it goes from Phoenix, on real roads
In October, from a full charge with 10% in reserve: about 162 mi out and back, 325 mi one way (January: 343 mi). Dots are DC fast chargers by network.
Fast charging around Phoenix
PlugLog's map of every public charger. Tesla-only Superchargers aren't counted.
- 93DC fast chargers within 25 mi
- 2.2 mito the nearest
- Tesla Supercharger110 in reach
- EVgo110
- ChargePoint110
- Electrify America65
- EV Connect25
Road trips in October, about, by road: Las Vegas (321 mi) and Tucson (151 mi) one way on a charge; San Diego (370 mi) with one fast stop.
Questions Phoenix drivers ask
How far can a Sierra EV go in a Phoenix winter?
Phoenix's winters are mild: about 381 miles on a typical January day (55°F) and about 378 in the coldest week (around December 17, 53°F), estimated from real EV drives at those temperatures. That's about its 390-mile rating. The harder season here is summer: about 361 miles in July, with the air conditioning on.
How much does it cost to charge a Sierra EV in Phoenix?
About $98 a month at home for 38 miles a day, at Arizona's average home electricity rate of 15.4¢/kWh: about 8.5¢ a mile. A gas Sierra on the West Coast's average gas ($5.01 a gallon) costs about $362 a month for the same driving.
Can I charge a Sierra EV on a regular 120 V outlet in Phoenix?
Not at 38 miles a day: a 120 V outlet adds only about 28 miles in 12 hours on an average day (29 in the coldest week). Plan on 240 V, which fills it from 10% in about 10 hours.
Is it greener to drive electric on Phoenix's grid?
Yes. Phoenix's grid (WECC Southwest) is about the US average, and a Sierra EV charged on it makes 68% less CO₂ than a gas Sierra.
Check it for your own address
Your street, your daily miles, any temperature on the knob.
Sierra EV Reality Check near Phoenix
Sources: temperatures, 30-year normals (NOAA 1991–2020) at Phoenix Deer Valley Muni Airport, AZ; home electricity, EIA (Arizona, July 2026); gas, EIA weekly (the West Coast); 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.