Colorado recorded its coldest statewide October in a decade and its fourth-coldest overall, based on official data from the National Centers for Environmental Information (NCEI).
Colorado recorded an average statewide temperature of 41.2 degrees in October, 5.3 degrees below the monthly average. It was also Colorado’s coldest October since 2009, and fourth-coldest overall.
That assessment is based on the statewide mean temperature, or the average between the daily high and low temperature over the course of the full month of October.
Colorado did, however, clinch its coldest average minimum temperature ever recorded for the month of October — an indication of just how cold it got at night and how bitterly cold the Arctic air mass that gripped Colorado in late October truly was.
Colorado’s average minimum temperature in October was 25.9 degrees, 6.1 degrees below the monthly average low of 32.0 degrees.
While the first week of October was relatively seasonable, two notable intrusions of Arctic air brought temperatures down to near-record levels. Denver tied its coldest overall October temperature in over 100 years, and a series of daily and monthly record lows were shattered statewide during the final week of the month.
Overall, Colorado is also experiencing its coldest start to a year since 2008, through October. Notably, however, Colorado is still 0.3 degrees above the 1901-2000 statewide mean temperature, an indication of the overall warming climate, even in the middle of a relatively cold year by recent standards.
The cold has lingered into November as well. Through Wednesday, Denver’s average November temperature was 7.3 degrees below average, and Grand Junction, Pueblo and Colorado Springs were all running well below month-to-date average levels as well.