National Weather ServiceWyomingDense Fog AdvisoryArchive to October 1, 2026
Dense Fog Advisories in Wyoming
The National Weather Service issued 32 dense fog advisories for Wyoming in 2025 and 21 a year on average in 2008-2025; in 2021-2025 it had the 33rd most of any state. 2026 through September: 12, 20% below the average of 15 for those months in 2008-2025. South Laramie Range was covered most often (162 times since 2008).
How many dense fog advisories does Wyoming get?
Every dense fog advisory that covered part of Wyoming. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 12 |
| 2025 | 32 |
| 2024 | 34 |
| 2023 | 33 |
| 2022 | 20 |
| 2021 | 21 |
| 2020 | 13 |
| 2019 | 31 |
| 2018 | 22 |
| 2017 | 25 |
| 2016 | 11 |
| 2015 | 27 |
| 2014 | 12 |
| 2013 | 9 |
| 2012 | 10 |
| 2011 | 17 |
| 2010 | 34 |
| 2009 | 9 |
| 2008 | 10 |
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 Wyoming 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 Wyoming?
| County or forecast zone | Since 2008 | Since 2023 | Last issued |
|---|---|---|---|
| South Laramie Range | 162 | 42 | August 16, 2026 |
| South Laramie Range Foothills | 145 | 35 | September 22, 2026 |
| Central Laramie County | 104 | 32 | September 22, 2026 |
| East Laramie County | 58 | 20 | September 23, 2026 |
| Northeastern Crook | 44 | 21 | January 2, 2026 |
| Wind River Basin | 33 | 12 | April 29, 2025 |
| Goshen County | 28 | 8 | October 15, 2025 |
| Central Laramie Range and Southwest Platte County | 26 | 6 | April 27, 2025 |
| East Platte County | 26 | 8 | October 15, 2025 |
| Southwest Wyoming | 22 | 5 | November 24, 2025 |
| Laramie Valley | 21 | 3 | May 1, 2026 |
| North Snowy Range Foothills | 21 | 6 | May 6, 2025 |
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 dense fog advisory?
A dense fog advisory means fog will cut visibility to a quarter mile or less over a wide area. 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 Wyoming.