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This was the warmest December in Denver in the past 9 years

The Front Range was warmer than average this month, while mountain valleys finished colder than average.

COLORADO, USA — Monday morning was the coldest day of the month for most of Colorado, including Denver which had a 3 degree low at the Denver International Airport. 

The perception is that it is always cold in December, right? It's strange to think that an average temperature of freezing, is actually warmer than average.   

The month of December is usually Denver’s coldest month of the year. With an average temperature of 30 degrees, it is just slightly colder than January's average of 30.7 degrees

Credit: KUSA
December is on average, the coldest month of the year in Denver with an average temperature 30.0 degrees. That is just slightly colder than January's average.

As of Sunday, Denver had an average temperature of 34.3 degrees for the month. The final 2 days will be pretty cold, though. 

RELATED: Warming up through the New Year! Highs in the 50s Wednesday

Monday will end up well below freezing will a high of 31 degrees. Tuesday may end up below freezing as well, with a forecast low of 12 degrees and a high of 45. 

That will likely drop our average closer to 34.0, but that is still a full 4 degrees warmer than average. And it would finish as the warmest December in 9 years for Denver.

Credit: KUSA
Denver is likely to finish December 2019 four degrees warmer than average.

All of the weather stations across the Front Range are reporting temperatures well above average for this December, although many of them have 2017 as even warmer. 

The average temperature for Denver in 2017 was 33.2 degrees, so the next warmest reading would be the 34.3 in 2010. 

Credit: KUSA
Denver's temperature at midnight on New Years Eve is likely to be the warmest in 6 years.

Those warm temperatures are expected to spill over into the beginning of 2020 with the warmest New Year's Eve in 6 years, and if we reach a high temp above 50 degrees on New Years Day, it would be the first time in 10 years.  

Credit: KUSA
Denver will have to rely on downsloping west winds to hit 50 on New Years Day, but if it happens, it will be the first in 10 years for the first day of the year.

Some spots in the mountain valleys are running colder than average thanks to extremely low temperatures like the ones recorded on Monday morning.

 A low of -48 degrees was recorded at Antero Reservoir; -26 in Alamosa, -26 in Gunnison, and -26 in Kremmling. Each one of those locations will finish the month below their average.

Credit: KUSA
Mountain valley's will finish December 2019 with below average temperatures.

Then the averages warm back up on the Western Slope. Places like Durango, Montrose, and Grand Junction will all finish way warmer than average for December 2019.

Credit: KUSA
Western Slope locations will finish warmer than average for December 2019.

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