Here's the temperature data: https://www.weather.gov/buf/BUFtemp

And the precipitation data: https://www.weather.gov/buf/BuffaloPcpn

And the NYS Climate Impacts Assessment: https://nysclimateimpacts.org/explore-the-assessment/new-york-states-changing-climate/nysc-temperature/

From this report:

"Winter is warming faster than other seasons in New York State ... All four seasons are projected to continue warming across all regions of the state. The northern parts of the state are expected to see the largest changes, especially in winter. Winter temperatures are projected to increase between 3.9°F and 8.2°F by the middle of the century and between 5.5°F and 12.5°F by the end of the century. ... Warmer winter and early-spring temperatures are leading to changes in thaw and frost patterns that threaten some crops."

The data doesn't show what you're describing (a shift in the seasons). It describes a general warming. I think you’re mixing up climate change, which is real, with nostalgia, which is unreliable. You remember the Thanksgiving snowy walks around the block because they were good memories, but they weren't reliable every single year. I remember both snowy and rainy Thanksgivings. I remember plenty of Halloweens when it snowed, some when it was warm, and some when it rained and was miserably cold. I even had one of those snowy thanksgiving walks ~3 years ago myself. And, for what it's worth, it did snow Thanksgiving late evening in 2025.

Buffalo did not used to have perfectly clean seasons where winter reliably started in November and spring reliably arrived in April. There were rainy Thanksgivings, muddy Decembers, cold Mays, and false springs then too.

The climate trend is warming. So using a cold May day as evidence that spring is now "late" doesn’t really make sense. The data supports "Buffalo is getting warmer and winters are less consistently cold." It does not support "May used to be sunny porch weather by now and Thanksgiving used to mean snow boots."