We get all 4 seasons in NYC, USA, and I cannot afford two sets of tires, so I have always run "summer snows". Not a full-on winter compound that simply disintegrates in summer heat, but rather an "all weather / all season" tire with the three peak & snowflake logo - essential if you get real snow like we do.
My first 5 years were on a set of four 145/70R12 69Q Hankook Winter Icept W605 (on the 4.5x12 Rover Minilites that it sounds like you have).
I could pass Jeeps in the snow with those, and they worked reasonably well in the dry and wet, I even ran a few laps around Watkins Glen when they were nearly worn down to slicks near the end of their life).
But they aren't available anymore, so I moved onto a set of four Nankang SV-2. I've had them for about 4 years and am still pretty happy with them. I even think they'll start cracking from age and being parked outside before the tread is all gone.
My next set of tires will likely be the Nankang SV-3 from Minispares
http://www.minispare.../12/TYRE27.aspx because they've copied their new tread design from Michelin's Cross Climate 2. Watch this video about this new directional tread design trend
https://youtu.be/PT2odY3C6Og
But see
https://www.nankangt...ts/winter/sv-3/ for the new tread design - Note that the picture on the Minispares site is still the SV-2), so hopefully they will be even better than the SV-2 have been for me. And, honestly, simply because I can afford them.
Another, twice as expensive tire to consider is the Pirelli mentioned above - but only if it is their SF2 all season tire here:
https://www.pirelli....all-season-sf-2 and here:
https://youtu.be/A3WssIxusLU
Unfortunately I can't tell if it is the SF2 on the Minispares site:
http://www.minispare...12/TYRE35.aspx, but it is more likely the CN54 as seen here:
https://www.longston...urato-cn54.html
Which is fine if you want that "vintage vibe", but don't expect terrific all weather road holding with a tread design that dates back to 1972.
Yes, the rubber is more modern, but read more here:
https://press.pirell...rato-500eng.pdf and here:
https://www.cinturato.net/125-12.html
Hope this is helpful!