We've lived in cold/snowy climates and more moderate/semi-tropical regions. Moderate weather definitely leads to more outdoor time, partly because it's just easier, especially with pre-schoolers. No fussing with layers of clothes, coats, hats, mittens, boots.......only to have to shed it all for a trip to the bathroom a few minutes after you get them all bundled up.
My dc are teens now, so I've based my answers on our circumstances when they were preschool age.
Would you enroll your child in a preschool program which is predominantly outside all school year?
I would want a daily outdoor component, all year round.
Would you enroll them as an alternative to a regular preschool or as a supplement in addition to their regular preschool? It would depend on the full scale of activities available at the school, the philosophy, discipline methods etc.
Would you want/expect "academics" to a part of this program (reading, math skills, etc.)?
Yes. My dc were early readers and enjoyed math activities at that age. They sought out those activities. If these activities weren't available, then I would probably use an outdoor pre-school in addition to a regular preschool.
How many days a week would you be interested in (3-5 years old)? How many hours?
When my dc were pre-school age, I was working full time. I would have considered full days. Again, depending on the activities available.
Would you prefer to enroll for a whole year or have the option of only signing up by semester?
If your child is in half day kindergarten, would you be interested in this as an afternoon program for them?
Yes, I would have. Transportation would have been an issue for me as a working mom. If there was a pick-up from school and a lunch program, that would have been helpful.
What would you expect in the way of access to shelter and bathrooms?
Readily available shelter if weather turns nasty and bathrooms as needed, but not necessarily running water/flush toilets etc.
What would you expect to be the lowest temperature in which children are allowed to remain outside?
-15 F is fine for a typical outdoor recess period (15 to 30 minutes), as long as the children are dressed suitably. How low depends in part on how long they are outside.
What percentage of outdoor time vs. indoor time would be ideal for you? (i.e. 75% of time outside, 25% inside, etc.)
Somewhere between 50/50 and 60/40 outdoor to indoor. I would like it if they were crafting and studying their finds on nature walks, having snack, reading etc. In a winter setting, much of that would happen indoors.
Any other concerns/opinions/ideas?
Supervision - the ratio of instructors/caregivers to children.
Location - Where are the outdoor areas - a backyard or local park in our neighbourhood or a nature and wildlife reserve some distance away?
Transportation - If the outdoor program isn't in the neighbourhood, how is travel to different outdoor areas managed? What kind of vehicles and car seats, driving records of the drivers etc.