![]() ![]() All 48 states experienced winter warming over this time period. ![]() Temperature changes vary by state, with larger seasonal increases across the northern states and the Mountain West, and smaller increases in the South and Southeast (see Figure 2).Warmer average summer temperatures align with the observation that extremely hot temperatures have become more frequent since the mid-20 th century (see the Heat Waves indicator). Warmer winter, spring, and fall temperatures are also consistent with longer growing seasons (see the Length of Growing Season indicator). A trend toward warmer winters is consistent with observed reductions in snow (see the Snowfall, Snow Cover, and Snowpack indicators) and shorter ice seasons (see the Lake Ice indicator).Spring temperatures have increased by about 2☏, while summer and fall temperatures have increased by about 1.5☏. ![]() Since 1896, average winter temperatures across the contiguous 48 states have increased by nearly 3☏ (see Figures 1 and 3). ![]()
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