Following above-normal warmth to start the week, snow and freezing temperatures will return for Denver by late in the week.
Highs will climb into the 70s in Denver on Monday and Tuesday, rising about 10-15 degrees above normal. An area of high pressure will dominate, promoting the dry weather with partial sunshine and unusual warmth.
On Wednesday, the high will top out closer to normal in the lower 60s before drastic changes occur overnight. A powerful cold front will plow through the area, bringing rain followed by snow as the low plummets below freezing.
"Denver's first snow! #snow #1stsnow #notreadyforsnow #sopretty #nofilter #bestoftheday #picoftheday," said Instagram user melauder on Oct. 7, 2012.
Colder air will linger through the rest of the week with highs reaching only near freezing on Friday. The best chance of accumulating snow will occur during the day Friday.
Keep checking back with AccuWeather.com for the latest on this week's wild weather.
A cold front swinging into the Northeast will bring the threat of severe weather to part of the region on Tuesday afternoon.
The late-season swelter will continue along much of the Atlantic Seaboard through the week as tens of millions head back to school and work.
Tropical Storm Dolly has formed in the southwestern Gulf of Mexico's Bay of Campeche and will continue its west-northwest path during the next couple of days.
A second volcanic eruption occurred on Sunday morning in Iceland in the same area that had one on Friday.
While flooding is a threat, monsoonal rains will be beneficial for most areas across northwest India this week.
While Labor Day marks an unofficial end to the summer, the Chicago area will see warm, humid conditions continue before temperatures slide late in the week.
Matecumbe Key, FL (1935)
Labor Day Hurricane hit Florida. Pressure at Matecumbe Key dipped to 26.35"/892.3 mb. Most intense hurricane ever to hit the U.S. with 200-mph wind. Tide of 15 feet; 408 dead.
Mecca, CA (1950)
126 degrees - highest ever for U.S. in Sept.
East Coast (1775)