Sun angle isn't an issue until March 15th or so down on LI. If the rates are good with cold temps snow accumulates on the roads during the day before then. After March 15th it becomes much harder to snow cover roads during the daytime.
1am sleet was falling on my roof while heading to bed & at 4am saw on camera wife’s car was white. Knew things were on track for 4-8”. Happy we finally got a storm to produce, it has been over 2 years I think.