0w-20 and 5w-20 and nearly identical in theory, you'd have to do some digging through VOA's to find more precise information.
From looking at PQIA's report on Magnatec SP-rated 5w-20, it has a KV40 of 46.4, KV100 of 8.3, and a CCV@-30*c of 4,601
PQIA also reported Castrol Edge SN Plus 0w-20 at a KV40 of 43.6, KV100 of 8.4, and a CCV@-35*c of 5,175
I would lean towards 5w-20, if you need a top off quart, you'd be more likely to find a good enough 5w-20 at a Dollar General or gas station than a 0w-20. But, the climate of Rhode Island may point you towards a 0w-20 for better startup protection.