Weather for Flagg Ranch, Wyoming
Current Weather
Humidity: 93%
Feels Like: 23.9°F
Wind: SW 17 mph
Wind Gusts: 19.6 mph
Precipitation: 0 in
Cloud Cover: 100%
Visibility: 3 mi
UV Index: 0.1
Five Day Weather Forecast
Fri
H: 31°F
L: 23°F
Sat
H: 21°F
L: 9°F
Sun
H: 34°F
L: 18°F
Mon
H: 35°F
L: 18°F
Tue
H: 35°F
L: 17°F
Air Quality
Nitrogen Dioxide: 2.15 μg/m3
Sulphur Dioxide: 1.05 μg/m3
Ozone: 74 μg/m3
Astronomical
Sun Transit: 12:20 AM
Sunset: 4:47 PM
Daylight: 8 hrs 53 mins
Moon Transit: 12:05 AM
Moonset: 4:08 PM
Moon Phase: New
Moon Illumination: 1.1%
Best Times for Fishing or Hunting
Major Periods
9:10 PM - 11:40 PM11:35 AM - 2:05 PM
Minor Periods
3:38 PM - 5:08 PM7:34 AM - 9:04 AM
Action Rating: 5 out of 5
Winter Storm Warning issued December 19 at 1:01AM MST until December 20 at 5:00AM MST by NWS Riverton WY
Effective: Fri December 19, 2025, 1:01 AM
Expires: Fri December 19, 2025, 5:15 PM
* WHAT...Heavy snow. Additional snow accumulations between 4 to 8 inches, with higher amounts of 10 to 20 inches in southern Yellowstone. Additional snow around Mammoth of 1 to 3 inches. Winds may be gusting as high as 55 mph at times. * WHERE...Yellowstone National Park. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be very difficult, especially in the backcountry.
If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info .
Winter Storm Warning issued December 19 at 1:01AM MST until December 20 at 5:00AM MST by NWS Riverton WY
Effective: Fri December 19, 2025, 1:01 AM
Expires: Fri December 19, 2025, 5:15 PM
* WHAT...Heavy snow. Additional snow accumulations between 8 to 16 inches with higher elevations seeing 1 to 2 feet. Winds gusting as high as 55 mph. * WHERE...Absaroka Mountains and Teton and Gros Ventre Mountains. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be very difficult. The hazardous conditions will impact travel across Teton and Togwotee Passes. Blowing and drifting of snow is expected. Backcountry travel is not advised.
If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info .
Winter Weather Advisory issued December 19 at 1:01AM MST until December 20 at 5:00AM MST by NWS Riverton WY
Effective: Fri December 19, 2025, 1:01 AM
Expires: Fri December 19, 2025, 5:15 PM
* WHAT...Snow. Additional snow accumulations of 3 to 6 inches with lesser amounts of 2 to 4 inches across Star Valley. Winds gusting as high as 45 mph at times. * WHERE...Jackson Hole and Star Valley. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be difficult. The hazardous conditions could impact the Thursday evening and Friday morning as well as evening commutes. * ADDITIONAL DETAILS...Additional amounts of 6 to 10 inches for northern Jackson Valley, including around Moran Junction.
Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info .
Winter Weather Advisory issued December 19 at 5:55AM MST until December 20 at 5:00AM MST by NWS Pocatello ID
Effective: Fri December 19, 2025, 5:55 AM
Expires: Fri December 19, 2025, 3:00 PM
* WHAT...Snow. Additional snow accumulations up to 7 inches. Winds gusting as high as 55 mph. * WHERE...Big Hole Mountains, Centennial Mountains - Island Park, Bear River Range, and Caribou Range. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Friday morning and evening commutes. Strong winds could cause tree damage.
Slow down and use caution while traveling. Call 5 1 1 or visit 511.idaho.gov for the latest road conditions.
Winter Weather Advisory issued December 19 at 1:13PM MST until December 20 at 5:00AM MST by NWS Pocatello ID
Effective: Fri December 19, 2025, 1:13 PM
Expires: Sat December 20, 2025, 5:00 AM
* WHAT...Snow. Additional snow accumulations 3 to 8 inches, generally above 6500 ft. Winds gusting as high as 50 mph. * WHERE...Big Hole Mountains, Centennial Mountains - Island Park, Bear River Range, and Caribou Range. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Friday evening commute. Gusty winds could bring down tree branches.
Slow down and use caution while traveling. Call 5 1 1 or visit 511.idaho.gov for the latest road conditions.
Weather Forecast
Average Temperature: 28°F
Average Humidity: 94%
Wind: 22.4 mph
UV Index: 0.1
Air Quality
Nitrogen Dioxide: 2.1 μg/m3
Sulphur Dioxide: 2.16 μg/m3
Ozone: 85.92 μg/m3
Astronomical
Sun Transit: 12:20 AM
Sunset: 4:47 PM
Daylight: 8 hrs 53 mins
Moon Transit: 12:05 AM
Moonset: 4:08 PM
Moon Phase: New
Moon Illumination: 1.1%
Best Times for Fishing or Hunting
Major Periods
9:10 PM - 11:40 PM11:35 AM - 2:05 PM
Minor Periods
3:38 PM - 5:08 PM7:34 AM - 9:04 AM
Action Rating: 5 out of 5
Weather Forecast
Average Temperature: 14.5°F
Average Humidity: 84%
Wind: 15.9 mph
UV Index: 0.3
Air Quality
Nitrogen Dioxide: 1.99 μg/m3
Sulphur Dioxide: 1.13 μg/m3
Ozone: 85.32 μg/m3
Astronomical
Sun Transit: 12:20 AM
Sunset: 4:47 PM
Daylight: 8 hrs 53 mins
Moon Transit: 12:58 AM
Moonset: 5:05 PM
Moon Phase: New
Moon Illumination: 0.0%
Best Times for Fishing or Hunting
Major Periods
12:00 AM - 12:00 AM12:28 AM - 2:58 PM
Minor Periods
4:35 PM - 6:05 PM8:24 AM - 9:54 AM
Action Rating: 4 out of 5
Weather Forecast
Average Temperature: 26.1°F
Average Humidity: 95%
Wind: 9.8 mph
UV Index: 0.1
Air Quality
Nitrogen Dioxide: 2.06 μg/m3
Sulphur Dioxide: 0.99 μg/m3
Ozone: 83.24 μg/m3
Astronomical
Sun Transit: 12:21 AM
Sunset: 4:47 PM
Daylight: 8 hrs 53 mins
Moon Transit: 1:50 PM
Moonset: 6:09 PM
Moon Phase: New
Moon Illumination: 1.5%
Best Times for Fishing or Hunting
Major Periods
12:00 AM - 12:00 AM1:20 PM - 3:50 PM
Minor Periods
5:39 PM - 7:09 PM9:06 AM - 10:36 AM
Action Rating: 3 out of 5
Weather Forecast
Average Temperature: 27.6°F
Average Humidity: 99%
Wind: 9.8 mph
UV Index: 0.3
Air Quality
Nitrogen Dioxide: 2.74 μg/m3
Sulphur Dioxide: 1.31 μg/m3
Ozone: 74.72 μg/m3
Astronomical
Sun Transit: 12:21 AM
Sunset: 4:48 PM
Daylight: 8 hrs 53 mins
Moon Transit: 2:40 PM
Moonset: 7:17 PM
Moon Phase: Waxing Crescent
Moon Illumination: 5.5%
Best Times for Fishing or Hunting
Major Periods
12:00 AM - 12:00 AM2:10 PM - 4:40 PM
Minor Periods
6:47 PM - 8:17 PM9:41 AM - 11:11 AM
Action Rating: 3 out of 5
Weather Forecast
Average Temperature: 26.4°F
Average Humidity: 94%
Wind: 8.3 mph
UV Index: 0
Air Quality
Nitrogen Dioxide: 3.67 μg/m3
Sulphur Dioxide: 1.17 μg/m3
Ozone: 65.69 μg/m3
Astronomical
Sun Transit: 12:22 AM
Sunset: 4:49 PM
Daylight: 8 hrs 53 mins
Moon Transit: 3:27 PM
Moonset: 8:27 PM
Moon Phase: Waxing Crescent
Moon Illumination: 11.7%
Best Times for Fishing or Hunting
Major Periods
12:00 AM - 12:00 AM2:57 PM - 5:27 PM
Minor Periods
7:57 PM - 9:27 PM10:08 AM - 11:38 AM
Action Rating: 2 out of 5