I'd say anything from as little as 220 miles (3 miles/kwh) on the worst of the worst winter days miles up to 290 miles (3.9 miles/kwh) on a nice summers day when driven up to posted speed limits. It really depends on your actual speed and how cold/windy it actually is. Last January, temperatures varied between 15C on a very mild day in London and -15C at the top of a mountain in Cumbria.
You'll be fine either way with cheap overnight home charging, where it gets tricky us if you end up using public chargers. Tesla can is typically 35-45p depending on the time of day, AC chargers vary from 35p right up to 60p and rapids are usually least 65p and some are 80p+. It's the non-tesla units that will hurt and you will not need to go much charging on a public charger on a trip to get above 10p/mile.