Dense Fog in Montana

Events

291

Deaths

0

Injuries

0

Damage

None recorded

• Dense Fog and Freezing Fog in Montana, December 15 to 18, 20232 deaths · 5 injured · $70,000 · 2 eventsHigh pressure led to stable conditions and cold pool formation across the Northern Rockies. This led to a prolonged period of dense fog.
• Freezing Fog and Dense Fog in Montana, December 21 to 22, 20231 death · 2 injured · $100,000 · 3 eventsDense fog impacted a number of locations in western Montana, leading to black ice on roadways and impacts at area airports.
• Heavy Snow and High Wind in Montana, December 20 to 22, 202061 kt wind · 11 eventsBehind a warm front that pushed through the area on the the 21st, weak easterly flow along with clearing skies resulted in a widespread dense fog developing across the plains of North-Central Montana.
• Dense Fog in Montana, February 5 to 6, 199710 eventsUnusual widespread dense fog developed over the entire northeast corner of Montana. Visibility was near zero over portions of the area and overnight travel was discouraged.
• Dense Fog in Montana, February 16 to 18, 20169 eventsMultiple periods of dense fog occurred across portions of northeast Montana over a 3-day period.
• Dense Fog in Montana, December 10 to 11, 20209 eventsFor this time of year, after a warmer day on the 9th, recent additional melting of the patchy snow pack and some wet ground around the region provided some additional moisture near the surface.
• Dense Fog in Montana, January 1 to 4, 20239 eventsAreas of dense freezing fog formed over northeast Montana, with the river valleys of the Milk, Missouri and Yellowstone Rivers being most prone for development.
• Dense Fog in Montana, January 10 to 13, 20238 eventsAn area of freezing fog and low clouds moved south from Saskatchewan into northeastern Montana and remained over the area for a couple days.
• Dense Fog in Montana, January 14 to 16, 20238 eventsDense Freezing Fog developed over northeast Montana and remained in the area for multiple days.
• Dense Fog in Montana, January 17 to 20, 20238 eventsConditions were favorable again for widespread dense freezing fog to form over Northeast Montana.
• Dense Fog in Montana, November 12 to 13, 20177 eventsFog developed over much of northeast Montana on the evening of the 12th, persisting through the morning of the 13th across many areas. Visibility in many areas was reduced to below a quarter of a mile during this time.
• Dense Fog in Montana, December 20 to 21, 20156 eventsPersistent moist surface conditions under a strong inversion allowed dense fog to easily develop over portions of northeast Montana.
• Dense Fog in Montana, November 11 to 12, 20176 eventsFog developed over much of northeast Montana on the evening of the 11th, persisting through the morning of the 12th across many areas, and even into early afternoon across portions of Dawson County.
• Dense Fog in Montana, December 10 to 11, 20206 eventsDuring the evening hours on December 10th, satellite imagery and surface observations showed that low clouds and fog began to develop across Central and Northern Montana.
• Dense Fog in Montana, November 16, 20256 eventsAfter a day of rain and snow, clearing skies and colder air created areas of dense freezing fog near and north of US Highway 2 from the early morning into the afternoon hours of the 16th, in Roosevelt and Richland counties.
• Dense Fog in Montana, February 11 to 12, 20105 eventsA moist pacific airmass came in contact with snowcovered ground which resulted in dense fog.
• Winter Weather and Dense Fog in Montana, November 26 to 30, 20135 eventsA prolonged period of high pressure helped to strengthen temperature inversions across northwest Montana by the end of November. This allowed for cold pools to develop while temperatures in the higher elevations were able to warm into the 30's and even 40's in a few locations.
• Dense Fog in Montana, December 12 to 13, 20155 eventsThe continued low-level inversion and light or calm winds combined with sufficient moisture at the surface to allow widespread dense fog to return over portions of northeast Montana.
• Dense Fog in Montana, February 19 to 20, 20175 eventsWith near calm or light easterly winds, plentiful surface moisture easily formed into a large area of dense fog across portions of northeast Montana.
• Dense Fog in Montana, March 10 to 11, 20195 eventsAdded surface moisture, in part from recent snow melt, combined with clear skies overnight to form areas of dense fog, especially near and north of the Missouri River in northeast Montana.
• Dense Fog in Montana, December 23 to 24, 20195 eventsPersistent warm temperatures and snow melt provided moisture at the surface, which combined with clear skies and calm wind to produce periods of dense fog for a number of locations across northeast Montana.
• Dense Fog in Montana, November 13 to 15, 20195 eventsMoist conditions, clearing skies, dropping temperatures, and calm winds all contributed to conditions favorable for the development of dense freezing fog, off and on over these few days and nights.
• Dense Fog in Montana, March 27, 20215 eventsAccumulating rain and snowfall from the night before provided ample surface moisture just before skies cleared during the evening.
• Dense Fog in Montana, January 8 to 10, 20215 eventsMoisture trapped near the surface for many days and a benign weather pattern combined with suddenly clearing skies and colder temperatures, which allowed dense freezing fog to form over many locations in northeast Montana.
• Dense Fog in Montana, November 10 to 12, 20225 eventsCold Arctic air moved over the relatively warmer waters of Fort Peck Lake and generated widespread Dense Fog across the region.

Dense Fog everywhereEvery kind of event in Montana

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24.