Based on my location and climate (Minneapolis, MN), an all season is reasonable since when we do get snow, it's cleared relatively quickly. Roads are mainly wet or dry with the occasional snow storm that is usually cleared up by the next day.
My Explorer has Michelin Premier LTX tires and they are fine for 90%+ of my driving. Winter/Nordic tire would be better in some situations, but not worth the hassle and $ for those few occasions.
Watch this video to help you decide.
I always wondered if the 44F rule was true for all season tires.
Based on this test, depends on the surface.
They only did breaking tests in wet/dry and did a small track in snow.
This is on a car, so the tires tested are likely not available for SUV, but I would guess performance is similar on an SUV with the categories of tires.
Short summary (with the tires tested):
- The nordic tire was the best in the snow and worst for both wet and dry braking.
- Winter tire was 2nd best on the snow, 2nd worst in dry braking and a mixed result for wet braking depending on temp.
- All season tire was OK in snow, better than winter in dry braking and as good or better than winter tire in wet braking down to 2C
- Summer tire was terrible in snow, best in dry braking down to 0C and wet braking was mixed (2nd worst at 2C and best at 15C)
If you want to jump to their test results:
-Wet braking: 6:17
-Snow course: 8:06
-Dry braking: 10:00
But, the charts aren't everything, so watch the video. He has a few comments about the tires that don't show up in the graphs.