Sun dogs, or parhelion, are caused when sunlight refracts through ice crystals, causing arcing pillars of light to appear on both sides of the sun.
NPS / John Collins
Wyoming weather is highly variable and can be extreme. Warm days and cool nights are the norm in the summer. There is little shade on hiking trails so make sure to bring extra water, hats, and sunscreen. However, even when it's in the 80s or 90s in the daytime, it can cool down into the 30s at night. Light frosts are common on summer nights and it can snow even in July. Thunder and lightning storms commonly roll through on summer mornings or evenings. If visiting in the spring, fall, or winter, come prepared for snow and varying winter conditions.
Forecasts
For current local weather conditions and extended forecasts check the National Weather Service's (NOAA) web page.
For information on air quality in the surrounding region, please visit the National Weather Service's (NOAA) Air Quality Forecast Guidance web page. This page can be a helpful tool during the summer and fall fire season.
