First and/or second season elk in Colorado - mid to late October. I've run into 70 degrees down to below zero. Most years its 20 in the AM, 45 in the PM. Snow has been an issue some years. I shot a bull in second season about 5-6 years ago standing in snow over my knees. Likely won't be doing the backpack thing when its like that. I'm planning on: 20-50 degrees, sunny with some rain and a small snowfalls (2-3"), pack in 3-5 miles for 2-3 day stints. Warmer/drier isn't an issue other than sweating. Colder/snowier is.
