National Weather ServiceIllinoisWinter Weather AdvisoryArchive to October 1, 2026
Winter Weather Advisories in Illinois
The National Weather Service issued 57 winter weather advisories for Illinois in 2025 and 54 a year on average in 2008-2025; in 2021-2025 it had the 22nd most of any state. 2026 through September: 18, 54% below the average of 40 for those months in 2008-2025. Henry was covered most often (177 times since 2008).
How many winter weather advisories does Illinois get?
Every winter weather advisory that covered part of Illinois. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 18 |
| 2025 | 57 |
| 2024 | 37 |
| 2023 | 41 |
| 2022 | 60 |
| 2021 | 53 |
| 2020 | 48 |
| 2019 | 101 |
| 2018 | 102 |
| 2017 | 22 |
| 2016 | 46 |
| 2015 | 43 |
| 2014 | 65 |
| 2013 | 52 |
| 2012 | 39 |
| 2011 | 43 |
| 2010 | 55 |
| 2009 | 47 |
| 2008 | 66 |
Source: Iowa Environmental Mesonet archive of National Weather Service watches, warnings and advisories (VTEC); National Weather Service. Data as of October 1, 2026.
When in the year does Illinois get them?
Sum of 2008-2025; the busiest month is labelled.
Source: Iowa Environmental Mesonet archive of National Weather Service watches, warnings and advisories (VTEC); National Weather Service. Data as of October 1, 2026.
Where in Illinois?
| County or forecast zone | Since 2008 | Since 2023 | Last issued |
|---|---|---|---|
| Henry | 177 | 23 | March 16, 2026 |
| Carroll | 176 | 29 | March 16, 2026 |
| Jo Daviess | 175 | 28 | March 16, 2026 |
| Whiteside | 173 | 24 | March 16, 2026 |
| Stephenson | 172 | 28 | March 16, 2026 |
| Rock Island | 168 | 25 | March 16, 2026 |
| Bureau | 165 | 21 | March 16, 2026 |
| Mercer | 164 | 22 | March 16, 2026 |
| Putnam | 164 | 21 | March 16, 2026 |
| Ogle | 159 | 24 | March 16, 2026 |
| Boone | 158 | 26 | March 16, 2026 |
| Winnebago | 158 | 26 | March 16, 2026 |
The NWS issues these products for counties or forecast zones; a zone can be part of a county or a mountain range.
Source: Iowa Environmental Mesonet archive of National Weather Service watches, warnings and advisories (VTEC); National Weather Service. Data as of October 1, 2026.
What is a winter weather advisory?
A winter weather advisory covers snow, sleet or freezing rain that will be a nuisance and can make roads slippery, below warning amounts. An advisory is issued for a hazard less serious than a warning that can still cause inconvenience or danger if people are not careful. The national record · Every warning type in Illinois.