The problem is that published adventures seldom include weather as a factor (in the old days, this was due to a paucity of both rules and available wordcount), so all too often published source material (except when handing players parched desert or howling 2) Published novels & 1e/2e game products let me know suzail & Sembia have quite warm summers, maybe some snow in winter but the picture is fairly fuzzy.

I’m curious about Cormyr, especially Eveningstar & Suzail, and Sembia’s climate, if you wouldn’t mind. But hard frozen ground, blizzards, and snow accumulated on the ground afflicts everywhere from the Gate northwards. …but the river runs strongly enough & is wide enough that the harbor isn't icebound (ships and small boats can break the thin morning skin of ice). Here’s the short form: everywhere in that area gets snow in winter, and freeze-up. Oh, we’ve published them, all right, but darned if I can remember after thirty-odd years of the “official” published Realms if I can remember where. Looking at Waterdeep to Daggerford specifically. Weather question… is there FR/ Sword Coast map or description of who gets snow in the winter? I FEEL like there is and I've seen it.

D&d daggerford map