A strengthening El Niño, with Niño 3.4 SST anomalies near +2.6°C and greater than 90% odds of a very strong event through fall and winter per NOAA’s Climate Prediction Center, is the dominant driver tilting odds toward a later first measurable snow (typically ≥0.1 inch liquid equivalent at official stations). This pattern favors above-normal September temperatures across much of the southern and western U.S., with equal chances or milder conditions in the Northeast and Midwest, extending summer-like warmth and suppressing early cold-air intrusions. Historical analogs from strong El Niño years show delayed first flakes in many mid-latitude cities, though higher elevations in the Rockies or Cascades can still see September snow under cooler, wetter Pacific Northwest signals. Traders should monitor the next CPC seasonal outlook, weekly ENSO updates, and short-range GFS/ECMWF runs for any rapid pattern shifts that could advance or further postpone the initial accumulation.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedFirst snow of the 2026 season

Buffalo, NY by October 31
56%

Denver, CO by October 31
63%

Minneapolis, MN by October 31
56%

Salt Lake City, UT by October 31
54%

Boston, MA by November 15
55%

Buffalo, NY by November 15
94%

Chicago, IL by November 15
63%

Denver, CO by November 15
94%

Detroit, MI by November 15
66%

Indianapolis, IN by November 15
75%

Kansas City, MO by November 15
36%

Minneapolis, MN by November 15
88%

Pittsburgh, PA by November 15
55%

Salt Lake City, UT by November 15
68%

Boston, MA by November 30
85%

Buffalo, NY by November 30
93%

Chicago, IL by November 30
73%

Cincinnati, OH by November 30
83%

Dallas, TX by November 30
11%

Denver, CO by November 30
99%

Detroit, MI by November 30
89%

Indianapolis, IN by November 30
94%

Kansas City, MO by November 30
71%

Minneapolis, MN by November 30
93%

Nashville, TN by November 30
29%

New York City, NY by November 30
68%

Philadelphia, PA by November 30
14%

Pittsburgh, PA by November 30
77%

Salt Lake City, UT by November 30
89%

St. Louis, MO by November 30
75%

Washington, DC by November 30
44%
$8,573 Vol.

Buffalo, NY by October 31
56%

Denver, CO by October 31
63%

Minneapolis, MN by October 31
56%

Salt Lake City, UT by October 31
54%

Boston, MA by November 15
55%

Buffalo, NY by November 15
94%

Chicago, IL by November 15
63%

Denver, CO by November 15
94%

Detroit, MI by November 15
66%

Indianapolis, IN by November 15
75%

Kansas City, MO by November 15
36%

Minneapolis, MN by November 15
88%

Pittsburgh, PA by November 15
55%

Salt Lake City, UT by November 15
68%

Boston, MA by November 30
85%

Buffalo, NY by November 30
93%

Chicago, IL by November 30
73%

Cincinnati, OH by November 30
83%

Dallas, TX by November 30
11%

Denver, CO by November 30
99%

Detroit, MI by November 30
89%

Indianapolis, IN by November 30
94%

Kansas City, MO by November 30
71%

Minneapolis, MN by November 30
93%

Nashville, TN by November 30
29%

New York City, NY by November 30
68%

Philadelphia, PA by November 30
14%

Pittsburgh, PA by November 30
77%

Salt Lake City, UT by November 30
89%

St. Louis, MO by November 30
75%

Washington, DC by November 30
44%
Any amount of snowfall qualifies, including a report of "T" (trace) - snow observed but too little to measure. Once snowfall is reported, this market resolves "Yes" immediately, without waiting for the rest of the window. This market resolves "No" only if no snowfall is reported for any day of the window.
The observation day is the National Weather Service climate day at KBUF (midnight to midnight local time, America/New_York).
Resolution is based on the station's first published snowfall figure for each day, as given in the first final Daily Climate Report for that day. Intermediate reports issued during the day are not used. Subsequent revisions or corrections will not be considered; the first published value is final. A report whose snowfall value is missing (for example, shown as "M") does not count as a published value; the snowfall figure for that day will be taken from the first subsequent report that includes one. If a day's snowfall value is missing but the month-to-date or season-to-date snowfall total in that day's final report is higher than in the previous day's final report, snow fell on that day and this market resolves "Yes". This market resolves as soon as its outcome is determined - "Yes" as soon as any day's report shows snowfall, or "No" as soon as every day of the window has a published snowfall figure and every figure is zero. There is no waiting period. If any day's snowfall figure remains unpublished, the market will remain open until the earlier of the figure being published or the 3rd day after the specified date, 11:59 PM ET, at which point any such day is treated as zero snowfall.
The resolution source for this market is the NWS Daily Climate Report for KBUF, issued as product CLIBUF. That page shows the latest report only; past daily reports are archived on the Iowa Environmental Mesonet at https://mesonet.agron.iastate.edu/wx/afos/list.phtml?by=pil&pil=CLIBUF.
Market Opened: Sep 2, 2026, 4:27 PM ET
Any amount of snowfall qualifies, including a report of "T" (trace) - snow observed but too little to measure. Once snowfall is reported, this market resolves "Yes" immediately, without waiting for the rest of the window. This market resolves "No" only if no snowfall is reported for any day of the window.
The observation day is the National Weather Service climate day at KBUF (midnight to midnight local time, America/New_York).
Resolution is based on the station's first published snowfall figure for each day, as given in the first final Daily Climate Report for that day. Intermediate reports issued during the day are not used. Subsequent revisions or corrections will not be considered; the first published value is final. A report whose snowfall value is missing (for example, shown as "M") does not count as a published value; the snowfall figure for that day will be taken from the first subsequent report that includes one. If a day's snowfall value is missing but the month-to-date or season-to-date snowfall total in that day's final report is higher than in the previous day's final report, snow fell on that day and this market resolves "Yes". This market resolves as soon as its outcome is determined - "Yes" as soon as any day's report shows snowfall, or "No" as soon as every day of the window has a published snowfall figure and every figure is zero. There is no waiting period. If any day's snowfall figure remains unpublished, the market will remain open until the earlier of the figure being published or the 3rd day after the specified date, 11:59 PM ET, at which point any such day is treated as zero snowfall.
The resolution source for this market is the NWS Daily Climate Report for KBUF, issued as product CLIBUF. That page shows the latest report only; past daily reports are archived on the Iowa Environmental Mesonet at https://mesonet.agron.iastate.edu/wx/afos/list.phtml?by=pil&pil=CLIBUF.
A strengthening El Niño, with Niño 3.4 SST anomalies near +2.6°C and greater than 90% odds of a very strong event through fall and winter per NOAA’s Climate Prediction Center, is the dominant driver tilting odds toward a later first measurable snow (typically ≥0.1 inch liquid equivalent at official stations). This pattern favors above-normal September temperatures across much of the southern and western U.S., with equal chances or milder conditions in the Northeast and Midwest, extending summer-like warmth and suppressing early cold-air intrusions. Historical analogs from strong El Niño years show delayed first flakes in many mid-latitude cities, though higher elevations in the Rockies or Cascades can still see September snow under cooler, wetter Pacific Northwest signals. Traders should monitor the next CPC seasonal outlook, weekly ENSO updates, and short-range GFS/ECMWF runs for any rapid pattern shifts that could advance or further postpone the initial accumulation.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · Updated

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