When Feng Qingxue received the package from Lu Jiang, it was already the last month of winter, and everywhere was covered in snow and ice.
It wasn't that it was snowing every day, rather that the snow didn't melt due to the persistent cold weather.
The weather at this time was nowhere near as mild as the weather experienced decades later after global warming took effect, with icy cold conditions once winter arrived.
Unless there was something very necessary such as delivering food to the Lu family, Feng Qingxue basically stayed at home with her younger sister, heating themselves by the fire, reading, or making clothes and shoes. Only when Feng Shuanzhu notified her that Lu Jiang had sent a letter and some items, and that she needed to take an ID letter he'd written to the post office to retrieve them, did she make a trip out.