answers: fall and winter
context: For most areas in the state, the temperatures in July during the daytime are approximately . In January the average temperatures range near . (However, a polar vortex or "cold blast" can significantly bring down average temperatures, seen in the winters of 2014 and 2015.) There is an average of forty-five inches of rain a year (fifty in the mountains). July storms account for much of this precipitation. As much as 15% of the rainfall during the warm season in the Carolinas can be attributed to tropical cyclones. Mountains usually see some snow in the fall and winter. Moist winds </s> and early spring temperatures are cooler than average with above average precipitation in the central and eastern parts of the state and drier weather in the western part. La Niña usually brings warmer than average temperatures with above average precipitation in the western part of the state while the central and coastal regions stay drier than average. The water on North Carolina's shores have risen but the reason is heavily discussed. Temperatures in North Carolina have risen too. Over the last 100 years, the average temperature in Chapel Hill has gone up 1.2 °F (0.7 °C) and precipitation in some </s> a city is struck by a Blue Norther, its temperates can be 30 to 50 degrees colder than neighboring cities that are only a few miles away that have not yet been struck. As it approaches, the windchill can become especially dangerous due to the rapid volatility of the temperature swings which often catch people unprepared. Blue Northers typically occur multiple times per year. They are usually recorded between the months of November and March, although they have been recorded less sparingly in October and April as well. The Blue Norther phenomenon is especially common in November, when the last
question: when does it snow in north carolina mountains