美国的冬季自1970年以来已大为暖和,2025年的热量创历史新高,拉尼娜现象对预测产生影响。 U.S. winters have warmed significantly since 1970, with 2025 seeing record heat and La Niña influencing forecasts.

自1970年以来,美国冬季平均热度为3.9摄氏度,现在是大多数地区,特别是上中西部、东北部、阿拉斯加和俄亥俄河谷,冬季是升温最快的季节。 Since 1970, U.S. winters have warmed by an average of 3.9°F, with winter now the fastest-warming season in most regions, especially in the Upper Midwest, Northeast, Alaska, and Ohio Valley. 来自244个城市的数据显示,98%的冬季经历较暖,大多数都比正常温度高出至少7天——在拉斯维加斯和旧金山等地,最多可达32天。 Data from 244 cities shows 98% experienced warmer winters, with most seeing at least seven more days above normal temperatures—up to 32 more in places like Las Vegas and San Francisco. Burlington和Milwaukee等城市的气温上升了7°F。 Cities such as Burlington and Milwaukee saw increases over 7°F. 后来在2025年首次冻结和极端的夏季热量与更广泛的气候趋势有关。 Later first freezes and extreme summer heat in 2025 are linked to broader climate trends. 预计2025-2026年冬季温度将高于南部和东海岸的平均温度,北部预计会出现湿润状况,受新出现的拉尼娜现象的影响。 Winter 2025–2026 is forecast to be warmer than average in the South and East Coast, with wetter conditions expected in the North, influenced by emerging La Niña conditions.