“Warmer winters have meant fewer opportunities to revel in the snow, go sledding and skiing, or venture onto the ice. But beyond making certain activities less feasible, warmer winters are also set to have devastating environmental impacts.
Plants and animals could have their growth and hibernation patterns thrown off, for example. According to Theresa Crimmins, director of the National Phenology Network and an associate professor at the University of Arizona, plants’ pollination schedules could become misaligned if they’re emerging sooner than they normally would and the insects that pollinate them aren’t yet ready to do so. Plants that sprout earlier in the year could also have a tougher time surviving if an unexpected cold front or frost comes back and kills off the initial buds.
Pests like mosquitoes could become more prevalent, too, says Crimmins, and potentially contribute to more diseases, since colder winters tend to depress their population.
A shift in winter could have major impacts on water supply as well, leading to a much smaller snowpack than people in the American West and Southwest currently rely on. Frozen snow that slowly melts over time is a major source of water for these parts of the country, and that resource could be severely reduced if there isn’t much snow to work with. During warmer winters, there’s typically less snow and more rain, which leads to smaller snowpacks and potentially huge dips in water as less snowmelt flows into rivers.
“Water supply affects pretty much everything, not just our drinking water: water for agriculture, water for hydropower, water for municipal uses, water for environmental concerns. It’s really comprehensive,” says Cara McCarthy, a program manager at the Natural Resources Conservation Service.
Water from these snowpacks can also help make sure the ground doesn’t become too dry, a factor that contributes to more frequent and more severe wildfires. The National Interagency Fire Center’s forecast through June has projected that parts of the Midwest and Southwest face a higher risk of wildfires this year due to the limited snowfall they received and a higher potential for drought.”
https://www.vox.com/policy/24098936/climate-change-snowpack-el-nino-spring-winter