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All depends on what kind of grill block you're running, the driving you're doing, and how much heat you're taking for the cabin. My Prius has a full grill block and still only gets to 150-160F driving around town when it's 30F out (this is usually with some cabin heat and pretty short trips). Doing 80MPH in the 30s gets coolant temps of ~203F, which is definitely on the higher end. Coolant temps are even high going more reasonable freeway speeds, so I take out half of one of the pieces of pipe insulation in the top grill (leaving 3/4ths of the top still blocked) if I'm going to be driving far in the 30s+. At 20F or lower, it'll stay at around 190F doing 80MPH with the full block.
With your higher winter temps, I wouldn't do a full block unless you're only doing short trips. Lower grill block should be fine, though, I was able to run one most of the year when I was in El Paso. Definitely get a Scangauge, Ultragauge, or bluetooth adapter with Torque app to monitor the coolant temps to stay safe when blocking the grill.
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