The closer to the equator, the more sun we get. Ironically, the hotter the solar panel, the less efficient it performs and so peak outputs are often seen on a cold, clear sunny day.
A complete 'no-no' with solar pv. Beware of long mid-winter shadows from tall trees or buildings. Shading has a massive detrimental effect on the output from a solar pv module and needs to be avoided wherever possible
If snow is to be expected regularly, a steeper tilt angle may be selected for the pv modules. Due to the dark surface of the solar module and the fact it's facing south on a tilt, when the sun shines the snow thaws and slides off fairly quickly.